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binutils-gdb/gdb/sparc-tdep.c
Andrew Cagney 41989fcd80 2003-10-06 Andrew Cagney <cagney@redhat.com> 
* breakpoint.c, breakpoint.h: Remove obsolete code and comments.
	* buildsym.c, dbxread.c, gdbtypes.c, mdebugread.c: Ditto.
	* monitor.c, sparc-tdep.c, stabsread.c: Ditto.
	* stabsread.h, xcoffread.c: Ditto.
2003-10-06 19:27:13 +00:00

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/* Target-dependent code for the SPARC for GDB, the GNU debugger.
Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation,
Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* ??? Support for calling functions from gdb in sparc64 is unfinished. */
#include "defs.h"
#include "arch-utils.h"
#include "frame.h"
#include "inferior.h"
#include "target.h"
#include "value.h"
#include "bfd.h"
#include "gdb_string.h"
#include "regcache.h"
#include "osabi.h"
#include "dis-asm.h"
#include "sparc-tdep.h"
#ifdef USE_PROC_FS
#include <sys/procfs.h>
/* Prototypes for supply_gregset etc. */
#include "gregset.h"
#endif
#include "gdbcore.h"
#include "gdb_assert.h"
#include "symfile.h" /* for 'entry_point_address' */
/*
* Some local macros that have multi-arch and non-multi-arch versions:
*/
#define SPARC_HAS_FPU 1
/* Number of bytes devoted to Floating Point registers: */
#define FP_REGISTER_BYTES (gdbarch_tdep (current_gdbarch)->fp_register_bytes)
/* Highest numbered Floating Point register. */
#define FP_MAX_REGNUM (gdbarch_tdep (current_gdbarch)->fp_max_regnum)
/* Size of a general (integer) register: */
#define SPARC_INTREG_SIZE (gdbarch_tdep (current_gdbarch)->intreg_size)
/* Offset within the call dummy stack of the saved registers. */
#define DUMMY_REG_SAVE_OFFSET (gdbarch_tdep (current_gdbarch)->reg_save_offset)
struct gdbarch_tdep
{
int fp_register_bytes;
int y_regnum;
int fp_max_regnum;
int intreg_size;
int reg_save_offset;
int call_dummy_call_offset;
int print_insn_mach;
};
/* Now make GDB_TARGET_IS_SPARC64 a runtime test. */
/* FIXME MVS: or try testing bfd_arch_info.arch and bfd_arch_info.mach ...
* define GDB_TARGET_IS_SPARC64 \
* (TARGET_ARCHITECTURE->arch == bfd_arch_sparc && \
* (TARGET_ARCHITECTURE->mach == bfd_mach_sparc_v9 || \
* TARGET_ARCHITECTURE->mach == bfd_mach_sparc_v9a))
*/
/* We don't store all registers immediately when requested, since they
get sent over in large chunks anyway. Instead, we accumulate most
of the changes and send them over once. "deferred_stores" keeps
track of which sets of registers we have locally-changed copies of,
so we only need send the groups that have changed. */
int deferred_stores = 0; /* Accumulated stores we want to do eventually. */
const unsigned char *
sparc_breakpoint_from_pc (CORE_ADDR *pc, int *len)
{
static const char breakpoint[] = {0x91, 0xd0, 0x20, 0x01};
(*len) = sizeof (breakpoint);
return breakpoint;
}
/* Fetch a single instruction. Even on bi-endian machines
such as sparc86x, instructions are always big-endian. */
static unsigned long
fetch_instruction (CORE_ADDR pc)
{
unsigned long retval;
int i;
unsigned char buf[4];
read_memory (pc, buf, sizeof (buf));
/* Start at the most significant end of the integer, and work towards
the least significant. */
retval = 0;
for (i = 0; i < sizeof (buf); ++i)
retval = (retval << 8) | buf[i];
return retval;
}
/* Branches with prediction are treated like their non-predicting cousins. */
/* FIXME: What about floating point branches? */
/* Macros to extract fields from sparc instructions. */
#define X_OP(i) (((i) >> 30) & 0x3)
#define X_RD(i) (((i) >> 25) & 0x1f)
#define X_A(i) (((i) >> 29) & 1)
#define X_COND(i) (((i) >> 25) & 0xf)
#define X_OP2(i) (((i) >> 22) & 0x7)
#define X_IMM22(i) ((i) & 0x3fffff)
#define X_OP3(i) (((i) >> 19) & 0x3f)
#define X_RS1(i) (((i) >> 14) & 0x1f)
#define X_I(i) (((i) >> 13) & 1)
#define X_IMM13(i) ((i) & 0x1fff)
/* Sign extension macros. */
#define X_SIMM13(i) ((X_IMM13 (i) ^ 0x1000) - 0x1000)
#define X_DISP22(i) ((X_IMM22 (i) ^ 0x200000) - 0x200000)
#define X_CC(i) (((i) >> 20) & 3)
#define X_P(i) (((i) >> 19) & 1)
#define X_DISP19(i) ((((i) & 0x7ffff) ^ 0x40000) - 0x40000)
#define X_RCOND(i) (((i) >> 25) & 7)
#define X_DISP16(i) ((((((i) >> 6) && 0xc000) | ((i) & 0x3fff)) ^ 0x8000) - 0x8000)
#define X_FCN(i) (((i) >> 25) & 31)
typedef enum
{
Error, not_branch, bicc, bicca, ba, baa, ticc, ta, done_retry
} branch_type;
/* Simulate single-step ptrace call for sun4. Code written by Gary
Beihl (beihl@mcc.com). */
/* npc4 and next_pc describe the situation at the time that the
step-breakpoint was set, not necessary the current value of DEPRECATED_NPC_REGNUM. */
static CORE_ADDR next_pc, npc4, target;
static int brknpc4, brktrg;
typedef char binsn_quantum[BREAKPOINT_MAX];
static binsn_quantum break_mem[3];
static branch_type isbranch (long, CORE_ADDR, CORE_ADDR *);
/* single_step() is called just before we want to resume the inferior,
if we want to single-step it but there is no hardware or kernel single-step
support (as on all SPARCs). We find all the possible targets of the
coming instruction and breakpoint them.
single_step is also called just after the inferior stops. If we had
set up a simulated single-step, we undo our damage. */
void
sparc_software_single_step (enum target_signal ignore, /* pid, but we don't need it */
int insert_breakpoints_p)
{
branch_type br;
CORE_ADDR pc;
long pc_instruction;
if (insert_breakpoints_p)
{
/* Always set breakpoint for NPC. */
next_pc = read_register (DEPRECATED_NPC_REGNUM);
npc4 = next_pc + 4; /* branch not taken */
target_insert_breakpoint (next_pc, break_mem[0]);
/* printf_unfiltered ("set break at %x\n",next_pc); */
pc = read_register (PC_REGNUM);
pc_instruction = fetch_instruction (pc);
br = isbranch (pc_instruction, pc, &target);
brknpc4 = brktrg = 0;
if (br == bicca)
{
/* Conditional annulled branch will either end up at
npc (if taken) or at npc+4 (if not taken).
Trap npc+4. */
brknpc4 = 1;
target_insert_breakpoint (npc4, break_mem[1]);
}
else if (br == baa && target != next_pc)
{
/* Unconditional annulled branch will always end up at
the target. */
brktrg = 1;
target_insert_breakpoint (target, break_mem[2]);
}
else if (GDB_TARGET_IS_SPARC64 && br == done_retry)
{
brktrg = 1;
target_insert_breakpoint (target, break_mem[2]);
}
}
else
{
/* Remove breakpoints */
target_remove_breakpoint (next_pc, break_mem[0]);
if (brknpc4)
target_remove_breakpoint (npc4, break_mem[1]);
if (brktrg)
target_remove_breakpoint (target, break_mem[2]);
}
}
struct frame_extra_info
{
CORE_ADDR bottom;
int in_prologue;
int flat;
/* Following fields only relevant for flat frames. */
CORE_ADDR pc_addr;
CORE_ADDR fp_addr;
/* Add this to ->frame to get the value of the stack pointer at the
time of the register saves. */
int sp_offset;
};
/* Call this for each newly created frame. For SPARC, we need to
calculate the bottom of the frame, and do some extra work if the
prologue has been generated via the -mflat option to GCC. In
particular, we need to know where the previous fp and the pc have
been stashed, since their exact position within the frame may vary. */
void
sparc_init_extra_frame_info (int fromleaf, struct frame_info *fi)
{
char *name;
CORE_ADDR prologue_start, prologue_end;
int insn;
frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
frame_saved_regs_zalloc (fi);
get_frame_extra_info (fi)->bottom =
(get_next_frame (fi)
? (get_frame_base (fi) == get_frame_base (get_next_frame (fi))
? get_frame_extra_info (get_next_frame (fi))->bottom
: get_frame_base (get_next_frame (fi)))
: read_sp ());
/* If fi->next is NULL, then we already set ->frame by passing
deprecated_read_fp() to create_new_frame. */
if (get_next_frame (fi))
{
char buf[MAX_REGISTER_SIZE];
/* Compute ->frame as if not flat. If it is flat, we'll change
it later. */
if (get_next_frame (get_next_frame (fi)) != NULL
&& ((get_frame_type (get_next_frame (get_next_frame (fi))) == SIGTRAMP_FRAME)
|| deprecated_frame_in_dummy (get_next_frame (get_next_frame (fi))))
&& frameless_look_for_prologue (get_next_frame (fi)))
{
/* A frameless function interrupted by a signal did not change
the frame pointer, fix up frame pointer accordingly. */
deprecated_update_frame_base_hack (fi, get_frame_base (get_next_frame (fi)));
get_frame_extra_info (fi)->bottom =
get_frame_extra_info (get_next_frame (fi))->bottom;
}
else
{
/* Should we adjust for stack bias here? */
ULONGEST tmp;
tmp = get_frame_register_unsigned (fi, DEPRECATED_FP_REGNUM);
deprecated_update_frame_base_hack (fi, tmp);
if (GDB_TARGET_IS_SPARC64 && (get_frame_base (fi) & 1))
deprecated_update_frame_base_hack (fi, get_frame_base (fi) + 2047);
}
}
/* Decide whether this is a function with a ``flat register window''
frame. For such functions, the frame pointer is actually in %i7. */
get_frame_extra_info (fi)->flat = 0;
get_frame_extra_info (fi)->in_prologue = 0;
if (find_pc_partial_function (get_frame_pc (fi), &name, &prologue_start, &prologue_end))
{
/* See if the function starts with an add (which will be of a
negative number if a flat frame) to the sp. FIXME: Does not
handle large frames which will need more than one instruction
to adjust the sp. */
insn = fetch_instruction (prologue_start);
if (X_OP (insn) == 2 && X_RD (insn) == 14 && X_OP3 (insn) == 0
&& X_I (insn) && X_SIMM13 (insn) < 0)
{
int offset = X_SIMM13 (insn);
/* Then look for a save of %i7 into the frame. */
insn = fetch_instruction (prologue_start + 4);
if (X_OP (insn) == 3
&& X_RD (insn) == 31
&& X_OP3 (insn) == 4
&& X_RS1 (insn) == 14)
{
char buf[MAX_REGISTER_SIZE];
/* We definitely have a flat frame now. */
get_frame_extra_info (fi)->flat = 1;
get_frame_extra_info (fi)->sp_offset = offset;
/* Overwrite the frame's address with the value in %i7. */
{
ULONGEST tmp;
tmp = get_frame_register_unsigned (fi, I7_REGNUM);
deprecated_update_frame_base_hack (fi, tmp);
}
if (GDB_TARGET_IS_SPARC64 && (get_frame_base (fi) & 1))
deprecated_update_frame_base_hack (fi, get_frame_base (fi) + 2047);
/* Record where the fp got saved. */
get_frame_extra_info (fi)->fp_addr =
get_frame_base (fi) + get_frame_extra_info (fi)->sp_offset + X_SIMM13 (insn);
/* Also try to collect where the pc got saved to. */
get_frame_extra_info (fi)->pc_addr = 0;
insn = fetch_instruction (prologue_start + 12);
if (X_OP (insn) == 3
&& X_RD (insn) == 15
&& X_OP3 (insn) == 4
&& X_RS1 (insn) == 14)
get_frame_extra_info (fi)->pc_addr =
get_frame_base (fi) + get_frame_extra_info (fi)->sp_offset + X_SIMM13 (insn);
}
}
else
{
/* Check if the PC is in the function prologue before a SAVE
instruction has been executed yet. If so, set the frame
to the current value of the stack pointer and set
the in_prologue flag. */
CORE_ADDR addr;
struct symtab_and_line sal;
sal = find_pc_line (prologue_start, 0);
if (sal.line == 0) /* no line info, use PC */
prologue_end = get_frame_pc (fi);
else if (sal.end < prologue_end)
prologue_end = sal.end;
if (get_frame_pc (fi) < prologue_end)
{
for (addr = prologue_start; addr < get_frame_pc (fi); addr += 4)
{
insn = read_memory_integer (addr, 4);
if (X_OP (insn) == 2 && X_OP3 (insn) == 0x3c)
break; /* SAVE seen, stop searching */
}
if (addr >= get_frame_pc (fi))
{
get_frame_extra_info (fi)->in_prologue = 1;
deprecated_update_frame_base_hack (fi, read_register (SP_REGNUM));
}
}
}
}
if (get_next_frame (fi) && get_frame_base (fi) == 0)
{
/* Kludge to cause init_prev_frame_info to destroy the new frame. */
deprecated_update_frame_base_hack (fi, get_frame_base (get_next_frame (fi)));
deprecated_update_frame_pc_hack (fi, get_frame_pc (get_next_frame (fi)));
}
}
CORE_ADDR
sparc_frame_chain (struct frame_info *frame)
{
/* Value that will cause DEPRECATED_FRAME_CHAIN_VALID to not worry
about the chain value. If it really is zero, we detect it later
in sparc_init_prev_frame.
Note: kevinb/2003-02-18: The constant 1 used to be returned here,
but, after some recent changes to legacy_frame_chain_valid(),
this value is no longer suitable for causing
legacy_frame_chain_valid() to "not worry about the chain value."
The constant ~0 (i.e, 0xfff...) causes the failing test in
legacy_frame_chain_valid() to succeed thus preserving the "not
worry" property. I had considered using something like
``get_frame_base (frame) + 1''. However, I think a constant
value is better, because when debugging this problem, I knew that
something funny was going on as soon as I saw the constant 1
being used as the frame chain elsewhere in GDB. */
return ~ (CORE_ADDR) 0;
}
/* Find the pc saved in frame FRAME. */
CORE_ADDR
sparc_frame_saved_pc (struct frame_info *frame)
{
char buf[MAX_REGISTER_SIZE];
CORE_ADDR addr;
if ((get_frame_type (frame) == SIGTRAMP_FRAME))
{
/* This is the signal trampoline frame.
Get the saved PC from the sigcontext structure. */
#ifndef SIGCONTEXT_PC_OFFSET
#define SIGCONTEXT_PC_OFFSET 12
#endif
CORE_ADDR sigcontext_addr;
char *scbuf;
int saved_pc_offset = SIGCONTEXT_PC_OFFSET;
char *name = NULL;
scbuf = alloca (TARGET_PTR_BIT / HOST_CHAR_BIT);
/* Solaris2 ucbsigvechandler passes a pointer to a sigcontext
as the third parameter. The offset to the saved pc is 12. */
find_pc_partial_function (get_frame_pc (frame), &name,
(CORE_ADDR *) NULL, (CORE_ADDR *) NULL);
if (name && STREQ (name, "ucbsigvechandler"))
saved_pc_offset = 12;
/* The sigcontext address is contained in register O2. */
{
ULONGEST tmp;
tmp = get_frame_register_unsigned (frame, O0_REGNUM + 2);
sigcontext_addr = tmp;
}
/* Don't cause a memory_error when accessing sigcontext in case the
stack layout has changed or the stack is corrupt. */
target_read_memory (sigcontext_addr + saved_pc_offset,
scbuf, sizeof (scbuf));
return extract_unsigned_integer (scbuf, sizeof (scbuf));
}
else if (get_frame_extra_info (frame)->in_prologue ||
(get_next_frame (frame) != NULL &&
((get_frame_type (get_next_frame (frame)) == SIGTRAMP_FRAME) ||
deprecated_frame_in_dummy (get_next_frame (frame))) &&
frameless_look_for_prologue (frame)))
{
/* A frameless function interrupted by a signal did not save
the PC, it is still in %o7. */
ULONGEST tmp;
tmp = get_frame_register_unsigned (frame, O7_REGNUM);
return PC_ADJUST (tmp);
}
if (get_frame_extra_info (frame)->flat)
addr = get_frame_extra_info (frame)->pc_addr;
else
addr = get_frame_extra_info (frame)->bottom + FRAME_SAVED_I0 +
SPARC_INTREG_SIZE * (I7_REGNUM - I0_REGNUM);
if (addr == 0)
/* A flat frame leaf function might not save the PC anywhere,
just leave it in %o7. */
return PC_ADJUST (read_register (O7_REGNUM));
read_memory (addr, buf, SPARC_INTREG_SIZE);
return PC_ADJUST (extract_unsigned_integer (buf, SPARC_INTREG_SIZE));
}
/* Since an individual frame in the frame cache is defined by two
arguments (a frame pointer and a stack pointer), we need two
arguments to get info for an arbitrary stack frame. This routine
takes two arguments and makes the cached frames look as if these
two arguments defined a frame on the cache. This allows the rest
of info frame to extract the important arguments without
difficulty. */
struct frame_info *
setup_arbitrary_frame (int argc, CORE_ADDR *argv)
{
struct frame_info *frame;
if (argc != 2)
error ("Sparc frame specifications require two arguments: fp and sp");
frame = create_new_frame (argv[0], 0);
if (!frame)
internal_error (__FILE__, __LINE__,
"create_new_frame returned invalid frame");
get_frame_extra_info (frame)->bottom = argv[1];
deprecated_update_frame_pc_hack (frame, DEPRECATED_FRAME_SAVED_PC (frame));
return frame;
}
/* Given a pc value, skip it forward past the function prologue by
disassembling instructions that appear to be a prologue.
If FRAMELESS_P is set, we are only testing to see if the function
is frameless. This allows a quicker answer.
This routine should be more specific in its actions; making sure
that it uses the same register in the initial prologue section. */
static CORE_ADDR examine_prologue (CORE_ADDR, int, struct frame_info *,
CORE_ADDR *);
static CORE_ADDR
examine_prologue (CORE_ADDR start_pc, int frameless_p, struct frame_info *fi,
CORE_ADDR *saved_regs)
{
int insn;
int dest = -1;
CORE_ADDR pc = start_pc;
int is_flat = 0;
insn = fetch_instruction (pc);
/* Recognize the `sethi' insn and record its destination. */
if (X_OP (insn) == 0 && X_OP2 (insn) == 4)
{
dest = X_RD (insn);
pc += 4;
insn = fetch_instruction (pc);
}
/* Recognize an add immediate value to register to either %g1 or
the destination register recorded above. Actually, this might
well recognize several different arithmetic operations.
It doesn't check that rs1 == rd because in theory "sub %g0, 5, %g1"
followed by "save %sp, %g1, %sp" is a valid prologue (Not that
I imagine any compiler really does that, however). */
if (X_OP (insn) == 2
&& X_I (insn)
&& (X_RD (insn) == 1 || X_RD (insn) == dest))
{
pc += 4;
insn = fetch_instruction (pc);
}
/* Recognize any SAVE insn. */
if (X_OP (insn) == 2 && X_OP3 (insn) == 60)
{
pc += 4;
if (frameless_p) /* If the save is all we care about, */
return pc; /* return before doing more work */
insn = fetch_instruction (pc);
}
/* Recognize add to %sp. */
else if (X_OP (insn) == 2 && X_RD (insn) == 14 && X_OP3 (insn) == 0)
{
pc += 4;
if (frameless_p) /* If the add is all we care about, */
return pc; /* return before doing more work */
is_flat = 1;
insn = fetch_instruction (pc);
/* Recognize store of frame pointer (i7). */
if (X_OP (insn) == 3
&& X_RD (insn) == 31
&& X_OP3 (insn) == 4
&& X_RS1 (insn) == 14)
{
pc += 4;
insn = fetch_instruction (pc);
/* Recognize sub %sp, <anything>, %i7. */
if (X_OP (insn) == 2
&& X_OP3 (insn) == 4
&& X_RS1 (insn) == 14
&& X_RD (insn) == 31)
{
pc += 4;
insn = fetch_instruction (pc);
}
else
return pc;
}
else
return pc;
}
else
/* Without a save or add instruction, it's not a prologue. */
return start_pc;
while (1)
{
/* Recognize stores into the frame from the input registers.
This recognizes all non alternate stores of an input register,
into a location offset from the frame pointer between
+68 and +92. */
/* The above will fail for arguments that are promoted
(eg. shorts to ints or floats to doubles), because the compiler
will pass them in positive-offset frame space, but the prologue
will save them (after conversion) in negative frame space at an
unpredictable offset. Therefore I am going to remove the
restriction on the target-address of the save, on the theory
that any unbroken sequence of saves from input registers must
be part of the prologue. In un-optimized code (at least), I'm
fairly sure that the compiler would emit SOME other instruction
(eg. a move or add) before emitting another save that is actually
a part of the function body.
Besides, the reserved stack space is different for SPARC64 anyway.
MVS 4/23/2000 */
if (X_OP (insn) == 3
&& (X_OP3 (insn) & 0x3c) == 4 /* Store, non-alternate. */
&& (X_RD (insn) & 0x18) == 0x18 /* Input register. */
&& X_I (insn) /* Immediate mode. */
&& X_RS1 (insn) == 30) /* Off of frame pointer. */
; /* empty statement -- fall thru to end of loop */
else if (GDB_TARGET_IS_SPARC64
&& X_OP (insn) == 3
&& (X_OP3 (insn) & 0x3c) == 12 /* store, extended (64-bit) */
&& (X_RD (insn) & 0x18) == 0x18 /* input register */
&& X_I (insn) /* immediate mode */
&& X_RS1 (insn) == 30) /* off of frame pointer */
; /* empty statement -- fall thru to end of loop */
else if (X_OP (insn) == 3
&& (X_OP3 (insn) & 0x3c) == 36 /* store, floating-point */
&& X_I (insn) /* immediate mode */
&& X_RS1 (insn) == 30) /* off of frame pointer */
; /* empty statement -- fall thru to end of loop */
else if (is_flat
&& X_OP (insn) == 3
&& X_OP3 (insn) == 4 /* store? */
&& X_RS1 (insn) == 14) /* off of frame pointer */
{
if (saved_regs && X_I (insn))
saved_regs[X_RD (insn)] =
get_frame_base (fi) + get_frame_extra_info (fi)->sp_offset + X_SIMM13 (insn);
}
else
break;
pc += 4;
insn = fetch_instruction (pc);
}
return pc;
}
/* Advance PC across any function entry prologue instructions to reach
some "real" code. */
CORE_ADDR
sparc_skip_prologue (CORE_ADDR start_pc)
{
struct symtab_and_line sal;
CORE_ADDR func_start, func_end;
/* This is the preferred method, find the end of the prologue by
using the debugging information. */
if (find_pc_partial_function (start_pc, NULL, &func_start, &func_end))
{
sal = find_pc_line (func_start, 0);
if (sal.end < func_end
&& start_pc <= sal.end)
return sal.end;
}
/* Oh well, examine the code by hand. */
return examine_prologue (start_pc, 0, NULL, NULL);
}
/* Is the prologue at IP frameless? */
int
sparc_prologue_frameless_p (CORE_ADDR ip)
{
return ip == examine_prologue (ip, 1, NULL, NULL);
}
/* Check instruction at ADDR to see if it is a branch.
All non-annulled instructions will go to NPC or will trap.
Set *TARGET if we find a candidate branch; set to zero if not.
This isn't static as it's used by remote-sa.sparc.c. */
static branch_type
isbranch (long instruction, CORE_ADDR addr, CORE_ADDR *target)
{
branch_type val = not_branch;
long int offset = 0; /* Must be signed for sign-extend. */
*target = 0;
if (X_OP (instruction) == 0
&& (X_OP2 (instruction) == 2
|| X_OP2 (instruction) == 6
|| X_OP2 (instruction) == 1
|| X_OP2 (instruction) == 3
|| X_OP2 (instruction) == 5
|| (GDB_TARGET_IS_SPARC64 && X_OP2 (instruction) == 7)))
{
if (X_COND (instruction) == 8)
val = X_A (instruction) ? baa : ba;
else
val = X_A (instruction) ? bicca : bicc;
switch (X_OP2 (instruction))
{
case 7:
if (!GDB_TARGET_IS_SPARC64)
break;
/* else fall thru */
case 2:
case 6:
offset = 4 * X_DISP22 (instruction);
break;
case 1:
case 5:
offset = 4 * X_DISP19 (instruction);
break;
case 3:
offset = 4 * X_DISP16 (instruction);
break;
}
*target = addr + offset;
}
else if (GDB_TARGET_IS_SPARC64
&& X_OP (instruction) == 2
&& X_OP3 (instruction) == 62)
{
if (X_FCN (instruction) == 0)
{
/* done */
*target = read_register (TNPC_REGNUM);
val = done_retry;
}
else if (X_FCN (instruction) == 1)
{
/* retry */
*target = read_register (TPC_REGNUM);
val = done_retry;
}
}
return val;
}
/* Find register number REGNUM relative to FRAME and put its
(raw) contents in *RAW_BUFFER. Set *OPTIMIZED if the variable
was optimized out (and thus can't be fetched). If the variable
was fetched from memory, set *ADDRP to where it was fetched from,
otherwise it was fetched from a register.
The argument RAW_BUFFER must point to aligned memory. */
void
sparc_get_saved_register (char *raw_buffer, int *optimized, CORE_ADDR *addrp,
struct frame_info *frame, int regnum,
enum lval_type *lval)
{
struct frame_info *frame1;
CORE_ADDR addr;
if (!target_has_registers)
error ("No registers.");
if (optimized)
*optimized = 0;
addr = 0;
/* FIXME This code extracted from infcmd.c; should put elsewhere! */
if (frame == NULL)
{
/* error ("No selected frame."); */
if (!target_has_registers)
error ("The program has no registers now.");
if (deprecated_selected_frame == NULL)
error ("No selected frame.");
/* Try to use selected frame */
frame = get_prev_frame (deprecated_selected_frame);
if (frame == 0)
error ("Cmd not meaningful in the outermost frame.");
}
frame1 = get_next_frame (frame);
/* Get saved PC from the frame info if not in innermost frame. */
if (regnum == PC_REGNUM && frame1 != NULL)
{
if (lval != NULL)
*lval = not_lval;
if (raw_buffer != NULL)
{
/* Put it back in target format. */
store_unsigned_integer (raw_buffer, DEPRECATED_REGISTER_RAW_SIZE (regnum), get_frame_pc (frame));
}
if (addrp != NULL)
*addrp = 0;
return;
}
while (frame1 != NULL)
{
/* FIXME MVS: wrong test for dummy frame at entry. */
if (get_frame_pc (frame1) >= (get_frame_extra_info (frame1)->bottom
? get_frame_extra_info (frame1)->bottom
: read_sp ())
&& get_frame_pc (frame1) <= get_frame_base (frame1))
{
/* Dummy frame. All but the window regs are in there somewhere.
The window registers are saved on the stack, just like in a
normal frame. */
if (regnum >= G1_REGNUM && regnum < G1_REGNUM + 7)
addr = get_frame_base (frame1) + (regnum - G0_REGNUM) * SPARC_INTREG_SIZE
- (FP_REGISTER_BYTES + 8 * SPARC_INTREG_SIZE);
else if (regnum >= I0_REGNUM && regnum < I0_REGNUM + 8)
/* NOTE: cagney/2002-05-04: The call to get_prev_frame()
is safe/cheap - there will always be a prev frame.
This is because frame1 is initialized to frame->next
(frame1->prev == frame) and is then advanced towards
the innermost (next) frame. */
addr = (get_frame_extra_info (get_prev_frame (frame1))->bottom
+ (regnum - I0_REGNUM) * SPARC_INTREG_SIZE
+ FRAME_SAVED_I0);
else if (regnum >= L0_REGNUM && regnum < L0_REGNUM + 8)
/* NOTE: cagney/2002-05-04: The call to get_prev_frame()
is safe/cheap - there will always be a prev frame.
This is because frame1 is initialized to frame->next
(frame1->prev == frame) and is then advanced towards
the innermost (next) frame. */
addr = (get_frame_extra_info (get_prev_frame (frame1))->bottom
+ (regnum - L0_REGNUM) * SPARC_INTREG_SIZE
+ FRAME_SAVED_L0);
else if (regnum >= O0_REGNUM && regnum < O0_REGNUM + 8)
addr = get_frame_base (frame1) + (regnum - O0_REGNUM) * SPARC_INTREG_SIZE
- (FP_REGISTER_BYTES + 16 * SPARC_INTREG_SIZE);
else if (SPARC_HAS_FPU &&
regnum >= FP0_REGNUM && regnum < FP0_REGNUM + 32)
addr = get_frame_base (frame1) + (regnum - FP0_REGNUM) * 4
- (FP_REGISTER_BYTES);
else if (GDB_TARGET_IS_SPARC64 && SPARC_HAS_FPU &&
regnum >= FP0_REGNUM + 32 && regnum < FP_MAX_REGNUM)
addr = get_frame_base (frame1) + 32 * 4 + (regnum - FP0_REGNUM - 32) * 8
- (FP_REGISTER_BYTES);
else if (regnum >= Y_REGNUM && regnum < NUM_REGS)
addr = get_frame_base (frame1) + (regnum - Y_REGNUM) * SPARC_INTREG_SIZE
- (FP_REGISTER_BYTES + 24 * SPARC_INTREG_SIZE);
}
else if (get_frame_extra_info (frame1)->flat)
{
if (regnum == RP_REGNUM)
addr = get_frame_extra_info (frame1)->pc_addr;
else if (regnum == I7_REGNUM)
addr = get_frame_extra_info (frame1)->fp_addr;
else
{
CORE_ADDR func_start;
CORE_ADDR *regs;
regs = alloca (NUM_REGS * sizeof (CORE_ADDR));
memset (regs, 0, NUM_REGS * sizeof (CORE_ADDR));
find_pc_partial_function (get_frame_pc (frame1), NULL, &func_start, NULL);
examine_prologue (func_start, 0, frame1, regs);
addr = regs[regnum];
}
}
else
{
/* Normal frame. Local and In registers are saved on stack. */
if (regnum >= I0_REGNUM && regnum < I0_REGNUM + 8)
addr = (get_frame_extra_info (get_prev_frame (frame1))->bottom
+ (regnum - I0_REGNUM) * SPARC_INTREG_SIZE
+ FRAME_SAVED_I0);
else if (regnum >= L0_REGNUM && regnum < L0_REGNUM + 8)
addr = (get_frame_extra_info (get_prev_frame (frame1))->bottom
+ (regnum - L0_REGNUM) * SPARC_INTREG_SIZE
+ FRAME_SAVED_L0);
else if (regnum >= O0_REGNUM && regnum < O0_REGNUM + 8)
{
/* Outs become ins. */
int realnum;
frame_register (frame1, (regnum - O0_REGNUM + I0_REGNUM),
optimized, lval, addrp, &realnum, raw_buffer);
return;
}
}
if (addr != 0)
break;
frame1 = get_next_frame (frame1);
}
if (addr != 0)
{
if (lval != NULL)
*lval = lval_memory;
if (regnum == SP_REGNUM)
{
if (raw_buffer != NULL)
{
/* Put it back in target format. */
store_unsigned_integer (raw_buffer, DEPRECATED_REGISTER_RAW_SIZE (regnum), addr);
}
if (addrp != NULL)
*addrp = 0;
return;
}
if (raw_buffer != NULL)
read_memory (addr, raw_buffer, DEPRECATED_REGISTER_RAW_SIZE (regnum));
}
else
{
if (lval != NULL)
*lval = lval_register;
addr = DEPRECATED_REGISTER_BYTE (regnum);
if (raw_buffer != NULL)
deprecated_read_register_gen (regnum, raw_buffer);
}
if (addrp != NULL)
*addrp = addr;
}
/* Push an empty stack frame, and record in it the current PC, regs, etc.
We save the non-windowed registers and the ins. The locals and outs
are new; they don't need to be saved. The i's and l's of
the last frame were already saved on the stack. */
/* Definitely see tm-sparc.h for more doc of the frame format here. */
/* See tm-sparc.h for how this is calculated. */
#define DUMMY_STACK_REG_BUF_SIZE \
(((8+8+8) * SPARC_INTREG_SIZE) + FP_REGISTER_BYTES)
#define DUMMY_STACK_SIZE \
(DUMMY_STACK_REG_BUF_SIZE + DUMMY_REG_SAVE_OFFSET)
void
sparc_push_dummy_frame (void)
{
CORE_ADDR sp, old_sp;
char *register_temp;
register_temp = alloca (DUMMY_STACK_SIZE);
old_sp = sp = read_sp ();
if (GDB_TARGET_IS_SPARC64)
{
/* PC, NPC, CCR, FSR, FPRS, Y, ASI */
deprecated_read_register_bytes (DEPRECATED_REGISTER_BYTE (PC_REGNUM),
&register_temp[0],
DEPRECATED_REGISTER_RAW_SIZE (PC_REGNUM) * 7);
deprecated_read_register_bytes (DEPRECATED_REGISTER_BYTE (PSTATE_REGNUM),
&register_temp[7 * SPARC_INTREG_SIZE],
DEPRECATED_REGISTER_RAW_SIZE (PSTATE_REGNUM));
/* FIXME: not sure what needs to be saved here. */
}
else
{
/* Y, PS, WIM, TBR, PC, NPC, FPS, CPS regs */
deprecated_read_register_bytes (DEPRECATED_REGISTER_BYTE (Y_REGNUM),
&register_temp[0],
DEPRECATED_REGISTER_RAW_SIZE (Y_REGNUM) * 8);
}
deprecated_read_register_bytes (DEPRECATED_REGISTER_BYTE (O0_REGNUM),
&register_temp[8 * SPARC_INTREG_SIZE],
SPARC_INTREG_SIZE * 8);
deprecated_read_register_bytes (DEPRECATED_REGISTER_BYTE (G0_REGNUM),
&register_temp[16 * SPARC_INTREG_SIZE],
SPARC_INTREG_SIZE * 8);
if (SPARC_HAS_FPU)
deprecated_read_register_bytes (DEPRECATED_REGISTER_BYTE (FP0_REGNUM),
&register_temp[24 * SPARC_INTREG_SIZE],
FP_REGISTER_BYTES);
sp -= DUMMY_STACK_SIZE;
DEPRECATED_DUMMY_WRITE_SP (sp);
write_memory (sp + DUMMY_REG_SAVE_OFFSET, &register_temp[0],
DUMMY_STACK_REG_BUF_SIZE);
if (strcmp (target_shortname, "sim") != 0)
{
/* NOTE: cagney/2002-04-04: The code below originally contained
GDB's _only_ call to write_fp(). That call was eliminated by
inlining the corresponding code. For the 64 bit case, the
old function (sparc64_write_fp) did the below although I'm
not clear why. The same goes for why this is only done when
the underlying target is a simulator. */
if (GDB_TARGET_IS_SPARC64)
{
/* Target is a 64 bit SPARC. */
CORE_ADDR oldfp = read_register (DEPRECATED_FP_REGNUM);
if (oldfp & 1)
write_register (DEPRECATED_FP_REGNUM, old_sp - 2047);
else
write_register (DEPRECATED_FP_REGNUM, old_sp);
}
else
{
/* Target is a 32 bit SPARC. */
write_register (DEPRECATED_FP_REGNUM, old_sp);
}
/* Set return address register for the call dummy to the current PC. */
write_register (I7_REGNUM, read_pc () - 8);
}
else
{
/* The call dummy will write this value to FP before executing
the 'save'. This ensures that register window flushes work
correctly in the simulator. */
write_register (G0_REGNUM + 1, read_register (DEPRECATED_FP_REGNUM));
/* The call dummy will write this value to FP after executing
the 'save'. */
write_register (G0_REGNUM + 2, old_sp);
/* The call dummy will write this value to the return address (%i7) after
executing the 'save'. */
write_register (G0_REGNUM + 3, read_pc () - 8);
/* Set the FP that the call dummy will be using after the 'save'.
This makes backtraces from an inferior function call work properly. */
write_register (DEPRECATED_FP_REGNUM, old_sp);
}
}
/* sparc_frame_find_saved_regs (). This function is here only because
pop_frame uses it. Note there is an interesting corner case which
I think few ports of GDB get right--if you are popping a frame
which does not save some register that *is* saved by a more inner
frame (such a frame will never be a dummy frame because dummy
frames save all registers).
NOTE: cagney/2003-03-12: Since pop_frame has been rewritten to use
frame_unwind_register() the need for this function is questionable.
Stores, into an array of CORE_ADDR,
the addresses of the saved registers of frame described by FRAME_INFO.
This includes special registers such as pc and fp saved in special
ways in the stack frame. sp is even more special:
the address we return for it IS the sp for the next frame.
Note that on register window machines, we are currently making the
assumption that window registers are being saved somewhere in the
frame in which they are being used. If they are stored in an
inferior frame, find_saved_register will break.
On the Sun 4, the only time all registers are saved is when
a dummy frame is involved. Otherwise, the only saved registers
are the LOCAL and IN registers which are saved as a result
of the "save/restore" opcodes. This condition is determined
by address rather than by value.
The "pc" is not stored in a frame on the SPARC. (What is stored
is a return address minus 8.) sparc_pop_frame knows how to
deal with that. Other routines might or might not.
See tm-sparc.h (PUSH_DUMMY_FRAME and friends) for CRITICAL information
about how this works. */
static void sparc_frame_find_saved_regs (struct frame_info *, CORE_ADDR *);
static void
sparc_frame_find_saved_regs (struct frame_info *fi, CORE_ADDR *saved_regs_addr)
{
int regnum;
CORE_ADDR frame_addr = get_frame_base (fi);
gdb_assert (fi != NULL);
memset (saved_regs_addr, 0, NUM_REGS * sizeof (CORE_ADDR));
if (get_frame_pc (fi) >= (get_frame_extra_info (fi)->bottom
? get_frame_extra_info (fi)->bottom
: read_sp ())
&& get_frame_pc (fi) <= get_frame_base (fi))
{
/* Dummy frame. All but the window regs are in there somewhere. */
for (regnum = G1_REGNUM; regnum < G1_REGNUM + 7; regnum++)
saved_regs_addr[regnum] =
frame_addr + (regnum - G0_REGNUM) * SPARC_INTREG_SIZE
- DUMMY_STACK_REG_BUF_SIZE + 16 * SPARC_INTREG_SIZE;
for (regnum = I0_REGNUM; regnum < I0_REGNUM + 8; regnum++)
saved_regs_addr[regnum] =
frame_addr + (regnum - I0_REGNUM) * SPARC_INTREG_SIZE
- DUMMY_STACK_REG_BUF_SIZE + 8 * SPARC_INTREG_SIZE;
if (SPARC_HAS_FPU)
for (regnum = FP0_REGNUM; regnum < FP_MAX_REGNUM; regnum++)
saved_regs_addr[regnum] = frame_addr + (regnum - FP0_REGNUM) * 4
- DUMMY_STACK_REG_BUF_SIZE + 24 * SPARC_INTREG_SIZE;
if (GDB_TARGET_IS_SPARC64)
{
for (regnum = PC_REGNUM; regnum < PC_REGNUM + 7; regnum++)
{
saved_regs_addr[regnum] =
frame_addr + (regnum - PC_REGNUM) * SPARC_INTREG_SIZE
- DUMMY_STACK_REG_BUF_SIZE;
}
saved_regs_addr[PSTATE_REGNUM] =
frame_addr + 8 * SPARC_INTREG_SIZE - DUMMY_STACK_REG_BUF_SIZE;
}
else
for (regnum = Y_REGNUM; regnum < NUM_REGS; regnum++)
saved_regs_addr[regnum] =
frame_addr + (regnum - Y_REGNUM) * SPARC_INTREG_SIZE
- DUMMY_STACK_REG_BUF_SIZE;
frame_addr = (get_frame_extra_info (fi)->bottom
? get_frame_extra_info (fi)->bottom
: read_sp ());
}
else if (get_frame_extra_info (fi)->flat)
{
CORE_ADDR func_start;
find_pc_partial_function (get_frame_pc (fi), NULL, &func_start, NULL);
examine_prologue (func_start, 0, fi, saved_regs_addr);
/* Flat register window frame. */
saved_regs_addr[RP_REGNUM] = get_frame_extra_info (fi)->pc_addr;
saved_regs_addr[I7_REGNUM] = get_frame_extra_info (fi)->fp_addr;
}
else
{
/* Normal frame. Just Local and In registers */
frame_addr = (get_frame_extra_info (fi)->bottom
? get_frame_extra_info (fi)->bottom
: read_sp ());
for (regnum = L0_REGNUM; regnum < L0_REGNUM + 8; regnum++)
saved_regs_addr[regnum] =
(frame_addr + (regnum - L0_REGNUM) * SPARC_INTREG_SIZE
+ FRAME_SAVED_L0);
for (regnum = I0_REGNUM; regnum < I0_REGNUM + 8; regnum++)
saved_regs_addr[regnum] =
(frame_addr + (regnum - I0_REGNUM) * SPARC_INTREG_SIZE
+ FRAME_SAVED_I0);
}
if (get_next_frame (fi))
{
if (get_frame_extra_info (fi)->flat)
{
saved_regs_addr[O7_REGNUM] = get_frame_extra_info (fi)->pc_addr;
}
else
{
/* Pull off either the next frame pointer or the stack pointer */
CORE_ADDR next_next_frame_addr =
(get_frame_extra_info (get_next_frame (fi))->bottom
? get_frame_extra_info (get_next_frame (fi))->bottom
: read_sp ());
for (regnum = O0_REGNUM; regnum < O0_REGNUM + 8; regnum++)
saved_regs_addr[regnum] =
(next_next_frame_addr
+ (regnum - O0_REGNUM) * SPARC_INTREG_SIZE
+ FRAME_SAVED_I0);
}
}
/* Otherwise, whatever we would get from ptrace(GETREGS) is accurate */
/* FIXME -- should this adjust for the sparc64 offset? */
saved_regs_addr[SP_REGNUM] = get_frame_base (fi);
}
/* Discard from the stack the innermost frame, restoring all saved registers.
Note that the values stored in fsr by
deprecated_get_frame_saved_regs are *in the context of the called
frame*. What this means is that the i regs of fsr must be restored
into the o regs of the (calling) frame that we pop into. We don't
care about the output regs of the calling frame, since unless it's
a dummy frame, it won't have any output regs in it.
We never have to bother with %l (local) regs, since the called routine's
locals get tossed, and the calling routine's locals are already saved
on its stack. */
/* Definitely see tm-sparc.h for more doc of the frame format here. */
void
sparc_pop_frame (void)
{
struct frame_info *frame = get_current_frame ();
CORE_ADDR pc;
CORE_ADDR *fsr;
char *raw_buffer;
int regnum;
fsr = alloca (NUM_REGS * sizeof (CORE_ADDR));
raw_buffer = alloca (DEPRECATED_REGISTER_BYTES);
sparc_frame_find_saved_regs (frame, &fsr[0]);
if (SPARC_HAS_FPU)
{
if (fsr[FP0_REGNUM])
{
read_memory (fsr[FP0_REGNUM], raw_buffer, FP_REGISTER_BYTES);
deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (FP0_REGNUM),
raw_buffer, FP_REGISTER_BYTES);
}
if (!(GDB_TARGET_IS_SPARC64))
{
if (fsr[FPS_REGNUM])
{
read_memory (fsr[FPS_REGNUM], raw_buffer, SPARC_INTREG_SIZE);
deprecated_write_register_gen (FPS_REGNUM, raw_buffer);
}
if (fsr[CPS_REGNUM])
{
read_memory (fsr[CPS_REGNUM], raw_buffer, SPARC_INTREG_SIZE);
deprecated_write_register_gen (CPS_REGNUM, raw_buffer);
}
}
}
if (fsr[G1_REGNUM])
{
read_memory (fsr[G1_REGNUM], raw_buffer, 7 * SPARC_INTREG_SIZE);
deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (G1_REGNUM), raw_buffer,
7 * SPARC_INTREG_SIZE);
}
if (get_frame_extra_info (frame)->flat)
{
/* Each register might or might not have been saved, need to test
individually. */
for (regnum = L0_REGNUM; regnum < L0_REGNUM + 8; ++regnum)
if (fsr[regnum])
write_register (regnum, read_memory_integer (fsr[regnum],
SPARC_INTREG_SIZE));
for (regnum = I0_REGNUM; regnum < I0_REGNUM + 8; ++regnum)
if (fsr[regnum])
write_register (regnum, read_memory_integer (fsr[regnum],
SPARC_INTREG_SIZE));
/* Handle all outs except stack pointer (o0-o5; o7). */
for (regnum = O0_REGNUM; regnum < O0_REGNUM + 6; ++regnum)
if (fsr[regnum])
write_register (regnum, read_memory_integer (fsr[regnum],
SPARC_INTREG_SIZE));
if (fsr[O0_REGNUM + 7])
write_register (O0_REGNUM + 7,
read_memory_integer (fsr[O0_REGNUM + 7],
SPARC_INTREG_SIZE));
DEPRECATED_DUMMY_WRITE_SP (get_frame_base (frame));
}
else if (fsr[I0_REGNUM])
{
CORE_ADDR sp;
char *reg_temp;
reg_temp = alloca (SPARC_INTREG_SIZE * 16);
read_memory (fsr[I0_REGNUM], raw_buffer, 8 * SPARC_INTREG_SIZE);
/* Get the ins and locals which we are about to restore. Just
moving the stack pointer is all that is really needed, except
store_inferior_registers is then going to write the ins and
locals from the registers array, so we need to muck with the
registers array. */
sp = fsr[SP_REGNUM];
if (GDB_TARGET_IS_SPARC64 && (sp & 1))
sp += 2047;
read_memory (sp, reg_temp, SPARC_INTREG_SIZE * 16);
/* Restore the out registers.
Among other things this writes the new stack pointer. */
deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (O0_REGNUM), raw_buffer,
SPARC_INTREG_SIZE * 8);
deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (L0_REGNUM), reg_temp,
SPARC_INTREG_SIZE * 16);
}
if (!(GDB_TARGET_IS_SPARC64))
if (fsr[PS_REGNUM])
write_register (PS_REGNUM,
read_memory_integer (fsr[PS_REGNUM],
DEPRECATED_REGISTER_RAW_SIZE (PS_REGNUM)));
if (fsr[Y_REGNUM])
write_register (Y_REGNUM,
read_memory_integer (fsr[Y_REGNUM],
DEPRECATED_REGISTER_RAW_SIZE (Y_REGNUM)));
if (fsr[PC_REGNUM])
{
/* Explicitly specified PC (and maybe NPC) -- just restore them. */
write_register (PC_REGNUM,
read_memory_integer (fsr[PC_REGNUM],
DEPRECATED_REGISTER_RAW_SIZE (PC_REGNUM)));
if (fsr[DEPRECATED_NPC_REGNUM])
write_register (DEPRECATED_NPC_REGNUM,
read_memory_integer (fsr[DEPRECATED_NPC_REGNUM],
DEPRECATED_REGISTER_RAW_SIZE (DEPRECATED_NPC_REGNUM)));
}
else if (get_frame_extra_info (frame)->flat)
{
if (get_frame_extra_info (frame)->pc_addr)
pc = PC_ADJUST ((CORE_ADDR)
read_memory_integer (get_frame_extra_info (frame)->pc_addr,
DEPRECATED_REGISTER_RAW_SIZE (PC_REGNUM)));
else
{
/* I think this happens only in the innermost frame, if so then
it is a complicated way of saying
"pc = read_register (O7_REGNUM);". */
ULONGEST tmp;
tmp = get_frame_register_unsigned (frame, O7_REGNUM);
pc = PC_ADJUST (tmp);
}
write_register (PC_REGNUM, pc);
write_register (DEPRECATED_NPC_REGNUM, pc + 4);
}
else if (fsr[I7_REGNUM])
{
/* Return address in %i7 -- adjust it, then restore PC and NPC from it */
pc = PC_ADJUST ((CORE_ADDR) read_memory_integer (fsr[I7_REGNUM],
SPARC_INTREG_SIZE));
write_register (PC_REGNUM, pc);
write_register (DEPRECATED_NPC_REGNUM, pc + 4);
}
flush_cached_frames ();
}
/* On the Sun 4 under SunOS, the compile will leave a fake insn which
encodes the structure size being returned. If we detect such
a fake insn, step past it. */
CORE_ADDR
sparc_pc_adjust (CORE_ADDR pc)
{
unsigned long insn;
char buf[4];
int err;
err = target_read_memory (pc + 8, buf, 4);
insn = extract_unsigned_integer (buf, 4);
if ((err == 0) && (insn & 0xffc00000) == 0)
return pc + 12;
else
return pc + 8;
}
/* If pc is in a shared library trampoline, return its target.
The SunOs 4.x linker rewrites the jump table entries for PIC
compiled modules in the main executable to bypass the dynamic linker
with jumps of the form
sethi %hi(addr),%g1
jmp %g1+%lo(addr)
and removes the corresponding jump table relocation entry in the
dynamic relocations.
find_solib_trampoline_target relies on the presence of the jump
table relocation entry, so we have to detect these jump instructions
by hand. */
CORE_ADDR
sunos4_skip_trampoline_code (CORE_ADDR pc)
{
unsigned long insn1;
char buf[4];
int err;
err = target_read_memory (pc, buf, 4);
insn1 = extract_unsigned_integer (buf, 4);
if (err == 0 && (insn1 & 0xffc00000) == 0x03000000)
{
unsigned long insn2;
err = target_read_memory (pc + 4, buf, 4);
insn2 = extract_unsigned_integer (buf, 4);
if (err == 0 && (insn2 & 0xffffe000) == 0x81c06000)
{
CORE_ADDR target_pc = (insn1 & 0x3fffff) << 10;
int delta = insn2 & 0x1fff;
/* Sign extend the displacement. */
if (delta & 0x1000)
delta |= ~0x1fff;
return target_pc + delta;
}
}
return find_solib_trampoline_target (pc);
}
#ifdef USE_PROC_FS /* Target dependent support for /proc */
/* *INDENT-OFF* */
/* The /proc interface divides the target machine's register set up into
two different sets, the general register set (gregset) and the floating
point register set (fpregset). For each set, there is an ioctl to get
the current register set and another ioctl to set the current values.
The actual structure passed through the ioctl interface is, of course,
naturally machine dependent, and is different for each set of registers.
For the sparc for example, the general register set is typically defined
by:
typedef int gregset_t[38];
#define R_G0 0
...
#define R_TBR 37
and the floating point set by:
typedef struct prfpregset {
union {
u_long pr_regs[32];
double pr_dregs[16];
} pr_fr;
void * pr_filler;
u_long pr_fsr;
u_char pr_qcnt;
u_char pr_q_entrysize;
u_char pr_en;
u_long pr_q[64];
} prfpregset_t;
These routines provide the packing and unpacking of gregset_t and
fpregset_t formatted data.
*/
/* *INDENT-ON* */
/* Given a pointer to a general register set in /proc format (gregset_t *),
unpack the register contents and supply them as gdb's idea of the current
register values. */
void
supply_gregset (gdb_gregset_t *gregsetp)
{
prgreg_t *regp = (prgreg_t *) gregsetp;
int regi, offset = 0;
/* If the host is 64-bit sparc, but the target is 32-bit sparc,
then the gregset may contain 64-bit ints while supply_register
is expecting 32-bit ints. Compensate. */
if (sizeof (regp[0]) == 8 && SPARC_INTREG_SIZE == 4)
offset = 4;
/* GDB register numbers for Gn, On, Ln, In all match /proc reg numbers. */
/* FIXME MVS: assumes the order of the first 32 elements... */
for (regi = G0_REGNUM; regi <= I7_REGNUM; regi++)
{
supply_register (regi, ((char *) (regp + regi)) + offset);
}
/* These require a bit more care. */
supply_register (PC_REGNUM, ((char *) (regp + R_PC)) + offset);
supply_register (DEPRECATED_NPC_REGNUM, ((char *) (regp + R_nPC)) + offset);
supply_register (Y_REGNUM, ((char *) (regp + R_Y)) + offset);
if (GDB_TARGET_IS_SPARC64)
{
#ifdef R_CCR
supply_register (CCR_REGNUM, ((char *) (regp + R_CCR)) + offset);
#else
supply_register (CCR_REGNUM, NULL);
#endif
#ifdef R_FPRS
supply_register (FPRS_REGNUM, ((char *) (regp + R_FPRS)) + offset);
#else
supply_register (FPRS_REGNUM, NULL);
#endif
#ifdef R_ASI
supply_register (ASI_REGNUM, ((char *) (regp + R_ASI)) + offset);
#else
supply_register (ASI_REGNUM, NULL);
#endif
}
else /* sparc32 */
{
#ifdef R_PS
supply_register (PS_REGNUM, ((char *) (regp + R_PS)) + offset);
#else
supply_register (PS_REGNUM, NULL);
#endif
/* For 64-bit hosts, R_WIM and R_TBR may not be defined.
Steal R_ASI and R_FPRS, and hope for the best! */
#if !defined (R_WIM) && defined (R_ASI)
#define R_WIM R_ASI
#endif
#if !defined (R_TBR) && defined (R_FPRS)
#define R_TBR R_FPRS
#endif
#if defined (R_WIM)
supply_register (WIM_REGNUM, ((char *) (regp + R_WIM)) + offset);
#else
supply_register (WIM_REGNUM, NULL);
#endif
#if defined (R_TBR)
supply_register (TBR_REGNUM, ((char *) (regp + R_TBR)) + offset);
#else
supply_register (TBR_REGNUM, NULL);
#endif
}
/* Fill inaccessible registers with zero. */
if (GDB_TARGET_IS_SPARC64)
{
/*
* don't know how to get value of any of the following:
*/
supply_register (VER_REGNUM, NULL);
supply_register (TICK_REGNUM, NULL);
supply_register (PIL_REGNUM, NULL);
supply_register (PSTATE_REGNUM, NULL);
supply_register (TSTATE_REGNUM, NULL);
supply_register (TBA_REGNUM, NULL);
supply_register (TL_REGNUM, NULL);
supply_register (TT_REGNUM, NULL);
supply_register (TPC_REGNUM, NULL);
supply_register (TNPC_REGNUM, NULL);
supply_register (WSTATE_REGNUM, NULL);
supply_register (CWP_REGNUM, NULL);
supply_register (CANSAVE_REGNUM, NULL);
supply_register (CANRESTORE_REGNUM, NULL);
supply_register (CLEANWIN_REGNUM, NULL);
supply_register (OTHERWIN_REGNUM, NULL);
supply_register (ASR16_REGNUM, NULL);
supply_register (ASR17_REGNUM, NULL);
supply_register (ASR18_REGNUM, NULL);
supply_register (ASR19_REGNUM, NULL);
supply_register (ASR20_REGNUM, NULL);
supply_register (ASR21_REGNUM, NULL);
supply_register (ASR22_REGNUM, NULL);
supply_register (ASR23_REGNUM, NULL);
supply_register (ASR24_REGNUM, NULL);
supply_register (ASR25_REGNUM, NULL);
supply_register (ASR26_REGNUM, NULL);
supply_register (ASR27_REGNUM, NULL);
supply_register (ASR28_REGNUM, NULL);
supply_register (ASR29_REGNUM, NULL);
supply_register (ASR30_REGNUM, NULL);
supply_register (ASR31_REGNUM, NULL);
supply_register (ICC_REGNUM, NULL);
supply_register (XCC_REGNUM, NULL);
}
else
{
supply_register (CPS_REGNUM, NULL);
}
}
void
fill_gregset (gdb_gregset_t *gregsetp, int regno)
{
prgreg_t *regp = (prgreg_t *) gregsetp;
int regi, offset = 0;
/* If the host is 64-bit sparc, but the target is 32-bit sparc,
then the gregset may contain 64-bit ints while supply_register
is expecting 32-bit ints. Compensate. */
if (sizeof (regp[0]) == 8 && SPARC_INTREG_SIZE == 4)
offset = 4;
for (regi = 0; regi <= R_I7; regi++)
if ((regno == -1) || (regno == regi))
deprecated_read_register_gen (regi, (char *) (regp + regi) + offset);
if ((regno == -1) || (regno == PC_REGNUM))
deprecated_read_register_gen (PC_REGNUM, (char *) (regp + R_PC) + offset);
if ((regno == -1) || (regno == DEPRECATED_NPC_REGNUM))
deprecated_read_register_gen (DEPRECATED_NPC_REGNUM, (char *) (regp + R_nPC) + offset);
if ((regno == -1) || (regno == Y_REGNUM))
deprecated_read_register_gen (Y_REGNUM, (char *) (regp + R_Y) + offset);
if (GDB_TARGET_IS_SPARC64)
{
#ifdef R_CCR
if (regno == -1 || regno == CCR_REGNUM)
deprecated_read_register_gen (CCR_REGNUM, ((char *) (regp + R_CCR)) + offset);
#endif
#ifdef R_FPRS
if (regno == -1 || regno == FPRS_REGNUM)
deprecated_read_register_gen (FPRS_REGNUM, ((char *) (regp + R_FPRS)) + offset);
#endif
#ifdef R_ASI
if (regno == -1 || regno == ASI_REGNUM)
deprecated_read_register_gen (ASI_REGNUM, ((char *) (regp + R_ASI)) + offset);
#endif
}
else /* sparc32 */
{
#ifdef R_PS
if (regno == -1 || regno == PS_REGNUM)
deprecated_read_register_gen (PS_REGNUM, ((char *) (regp + R_PS)) + offset);
#endif
/* For 64-bit hosts, R_WIM and R_TBR may not be defined.
Steal R_ASI and R_FPRS, and hope for the best! */
#if !defined (R_WIM) && defined (R_ASI)
#define R_WIM R_ASI
#endif
#if !defined (R_TBR) && defined (R_FPRS)
#define R_TBR R_FPRS
#endif
#if defined (R_WIM)
if (regno == -1 || regno == WIM_REGNUM)
deprecated_read_register_gen (WIM_REGNUM, ((char *) (regp + R_WIM)) + offset);
#else
if (regno == -1 || regno == WIM_REGNUM)
deprecated_read_register_gen (WIM_REGNUM, NULL);
#endif
#if defined (R_TBR)
if (regno == -1 || regno == TBR_REGNUM)
deprecated_read_register_gen (TBR_REGNUM, ((char *) (regp + R_TBR)) + offset);
#else
if (regno == -1 || regno == TBR_REGNUM)
deprecated_read_register_gen (TBR_REGNUM, NULL);
#endif
}
}
/* Given a pointer to a floating point register set in /proc format
(fpregset_t *), unpack the register contents and supply them as gdb's
idea of the current floating point register values. */
void
supply_fpregset (gdb_fpregset_t *fpregsetp)
{
int regi;
char *from;
if (!SPARC_HAS_FPU)
return;
for (regi = FP0_REGNUM; regi < FP_MAX_REGNUM; regi++)
{
from = (char *) &fpregsetp->pr_fr.pr_regs[regi - FP0_REGNUM];
supply_register (regi, from);
}
if (GDB_TARGET_IS_SPARC64)
{
/*
* don't know how to get value of the following.
*/
supply_register (FSR_REGNUM, NULL); /* zero it out for now */
supply_register (FCC0_REGNUM, NULL);
supply_register (FCC1_REGNUM, NULL); /* don't know how to get value */
supply_register (FCC2_REGNUM, NULL); /* don't know how to get value */
supply_register (FCC3_REGNUM, NULL); /* don't know how to get value */
}
else
{
supply_register (FPS_REGNUM, (char *) &(fpregsetp->pr_fsr));
}
}
/* Given a pointer to a floating point register set in /proc format
(fpregset_t *), update the register specified by REGNO from gdb's idea
of the current floating point register set. If REGNO is -1, update
them all. */
/* This will probably need some changes for sparc64. */
void
fill_fpregset (gdb_fpregset_t *fpregsetp, int regno)
{
int regi;
char *to;
char *from;
if (!SPARC_HAS_FPU)
return;
for (regi = FP0_REGNUM; regi < FP_MAX_REGNUM; regi++)
{
if ((regno == -1) || (regno == regi))
{
from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regi)];
to = (char *) &fpregsetp->pr_fr.pr_regs[regi - FP0_REGNUM];
memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regi));
}
}
if (!(GDB_TARGET_IS_SPARC64)) /* FIXME: does Sparc64 have this register? */
if ((regno == -1) || (regno == FPS_REGNUM))
{
from = (char *)&deprecated_registers[DEPRECATED_REGISTER_BYTE (FPS_REGNUM)];
to = (char *) &fpregsetp->pr_fsr;
memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (FPS_REGNUM));
}
}
#endif /* USE_PROC_FS */
/* Because of Multi-arch, GET_LONGJMP_TARGET is always defined. So test
for a definition of JB_PC. */
#ifdef JB_PC
/* Figure out where the longjmp will land. We expect that we have just entered
longjmp and haven't yet setup the stack frame, so the args are still in the
output regs. %o0 (O0_REGNUM) points at the jmp_buf structure from which we
extract the pc (JB_PC) that we will land at. The pc is copied into ADDR.
This routine returns true on success */
int
get_longjmp_target (CORE_ADDR *pc)
{
CORE_ADDR jb_addr;
#define LONGJMP_TARGET_SIZE 4
char buf[LONGJMP_TARGET_SIZE];
jb_addr = read_register (O0_REGNUM);
if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
LONGJMP_TARGET_SIZE))
return 0;
*pc = extract_unsigned_integer (buf, LONGJMP_TARGET_SIZE);
return 1;
}
#endif /* GET_LONGJMP_TARGET */
#ifdef STATIC_TRANSFORM_NAME
/* SunPRO (3.0 at least), encodes the static variables. This is not
related to C++ mangling, it is done for C too. */
char *
sunpro_static_transform_name (char *name)
{
char *p;
if (name[0] == '$')
{
/* For file-local statics there will be a dollar sign, a bunch
of junk (the contents of which match a string given in the
N_OPT), a period and the name. For function-local statics
there will be a bunch of junk (which seems to change the
second character from 'A' to 'B'), a period, the name of the
function, and the name. So just skip everything before the
last period. */
p = strrchr (name, '.');
if (p != NULL)
name = p + 1;
}
return name;
}
#endif /* STATIC_TRANSFORM_NAME */
/* Utilities for printing registers.
Page numbers refer to the SPARC Architecture Manual. */
static void dump_ccreg (char *, int);
static void
dump_ccreg (char *reg, int val)
{
/* page 41 */
printf_unfiltered ("%s:%s,%s,%s,%s", reg,
val & 8 ? "N" : "NN",
val & 4 ? "Z" : "NZ",
val & 2 ? "O" : "NO",
val & 1 ? "C" : "NC");
}
static char *
decode_asi (int val)
{
/* page 72 */
switch (val)
{
case 4:
return "ASI_NUCLEUS";
case 0x0c:
return "ASI_NUCLEUS_LITTLE";
case 0x10:
return "ASI_AS_IF_USER_PRIMARY";
case 0x11:
return "ASI_AS_IF_USER_SECONDARY";
case 0x18:
return "ASI_AS_IF_USER_PRIMARY_LITTLE";
case 0x19:
return "ASI_AS_IF_USER_SECONDARY_LITTLE";
case 0x80:
return "ASI_PRIMARY";
case 0x81:
return "ASI_SECONDARY";
case 0x82:
return "ASI_PRIMARY_NOFAULT";
case 0x83:
return "ASI_SECONDARY_NOFAULT";
case 0x88:
return "ASI_PRIMARY_LITTLE";
case 0x89:
return "ASI_SECONDARY_LITTLE";
case 0x8a:
return "ASI_PRIMARY_NOFAULT_LITTLE";
case 0x8b:
return "ASI_SECONDARY_NOFAULT_LITTLE";
default:
return NULL;
}
}
/* Pretty print various registers. */
/* FIXME: Would be nice if this did some fancy things for 32 bit sparc. */
static void
sparc_print_register_hook (int regno)
{
ULONGEST val;
/* Handle double/quad versions of lower 32 fp regs. */
if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32
&& (regno & 1) == 0)
{
char value[16];
if (frame_register_read (deprecated_selected_frame, regno, value)
&& frame_register_read (deprecated_selected_frame, regno + 1, value + 4))
{
printf_unfiltered ("\t");
print_floating (value, builtin_type_double, gdb_stdout);
}
#if 0 /* FIXME: gdb doesn't handle long doubles */
if ((regno & 3) == 0)
{
if (frame_register_read (deprecated_selected_frame, regno + 2, value + 8)
&& frame_register_read (deprecated_selected_frame, regno + 3, value + 12))
{
printf_unfiltered ("\t");
print_floating (value, builtin_type_long_double, gdb_stdout);
}
}
#endif
return;
}
#if 0 /* FIXME: gdb doesn't handle long doubles */
/* Print upper fp regs as long double if appropriate. */
if (regno >= FP0_REGNUM + 32 && regno < FP_MAX_REGNUM
/* We test for even numbered regs and not a multiple of 4 because
the upper fp regs are recorded as doubles. */
&& (regno & 1) == 0)
{
char value[16];
if (frame_register_read (deprecated_selected_frame, regno, value)
&& frame_register_read (deprecated_selected_frame, regno + 1, value + 8))
{
printf_unfiltered ("\t");
print_floating (value, builtin_type_long_double, gdb_stdout);
}
return;
}
#endif
/* FIXME: Some of these are priviledged registers.
Not sure how they should be handled. */
#define BITS(n, mask) ((int) (((val) >> (n)) & (mask)))
val = read_register (regno);
/* pages 40 - 60 */
if (GDB_TARGET_IS_SPARC64)
switch (regno)
{
case CCR_REGNUM:
printf_unfiltered ("\t");
dump_ccreg ("xcc", val >> 4);
printf_unfiltered (", ");
dump_ccreg ("icc", val & 15);
break;
case FPRS_REGNUM:
printf ("\tfef:%d, du:%d, dl:%d",
BITS (2, 1), BITS (1, 1), BITS (0, 1));
break;
case FSR_REGNUM:
{
static char *fcc[4] =
{"=", "<", ">", "?"};
static char *rd[4] =
{"N", "0", "+", "-"};
/* Long, but I'd rather leave it as is and use a wide screen. */
printf_filtered ("\t0:%s, 1:%s, 2:%s, 3:%s, rd:%s, tem:%d, ",
fcc[BITS (10, 3)], fcc[BITS (32, 3)],
fcc[BITS (34, 3)], fcc[BITS (36, 3)],
rd[BITS (30, 3)], BITS (23, 31));
printf_filtered ("ns:%d, ver:%d, ftt:%d, qne:%d, aexc:%d, cexc:%d",
BITS (22, 1), BITS (17, 7), BITS (14, 7),
BITS (13, 1), BITS (5, 31), BITS (0, 31));
break;
}
case ASI_REGNUM:
{
char *asi = decode_asi (val);
if (asi != NULL)
printf ("\t%s", asi);
break;
}
case VER_REGNUM:
printf ("\tmanuf:%d, impl:%d, mask:%d, maxtl:%d, maxwin:%d",
BITS (48, 0xffff), BITS (32, 0xffff),
BITS (24, 0xff), BITS (8, 0xff), BITS (0, 31));
break;
case PSTATE_REGNUM:
{
static char *mm[4] =
{"tso", "pso", "rso", "?"};
printf_filtered ("\tcle:%d, tle:%d, mm:%s, red:%d, ",
BITS (9, 1), BITS (8, 1),
mm[BITS (6, 3)], BITS (5, 1));
printf_filtered ("pef:%d, am:%d, priv:%d, ie:%d, ag:%d",
BITS (4, 1), BITS (3, 1), BITS (2, 1),
BITS (1, 1), BITS (0, 1));
break;
}
case TSTATE_REGNUM:
/* FIXME: print all 4? */
break;
case TT_REGNUM:
/* FIXME: print all 4? */
break;
case TPC_REGNUM:
/* FIXME: print all 4? */
break;
case TNPC_REGNUM:
/* FIXME: print all 4? */
break;
case WSTATE_REGNUM:
printf ("\tother:%d, normal:%d", BITS (3, 7), BITS (0, 7));
break;
case CWP_REGNUM:
printf ("\t%d", BITS (0, 31));
break;
case CANSAVE_REGNUM:
printf ("\t%-2d before spill", BITS (0, 31));
break;
case CANRESTORE_REGNUM:
printf ("\t%-2d before fill", BITS (0, 31));
break;
case CLEANWIN_REGNUM:
printf ("\t%-2d before clean", BITS (0, 31));
break;
case OTHERWIN_REGNUM:
printf ("\t%d", BITS (0, 31));
break;
}
else /* Sparc32 */
switch (regno)
{
case PS_REGNUM:
printf ("\ticc:%c%c%c%c, pil:%d, s:%d, ps:%d, et:%d, cwp:%d",
BITS (23, 1) ? 'N' : '-', BITS (22, 1) ? 'Z' : '-',
BITS (21, 1) ? 'V' : '-', BITS (20, 1) ? 'C' : '-',
BITS (8, 15), BITS (7, 1), BITS (6, 1), BITS (5, 1),
BITS (0, 31));
break;
case FPS_REGNUM:
{
static char *fcc[4] =
{"=", "<", ">", "?"};
static char *rd[4] =
{"N", "0", "+", "-"};
/* Long, but I'd rather leave it as is and use a wide screen. */
printf ("\trd:%s, tem:%d, ns:%d, ver:%d, ftt:%d, qne:%d, "
"fcc:%s, aexc:%d, cexc:%d",
rd[BITS (30, 3)], BITS (23, 31), BITS (22, 1), BITS (17, 7),
BITS (14, 7), BITS (13, 1), fcc[BITS (10, 3)], BITS (5, 31),
BITS (0, 31));
break;
}
}
#undef BITS
}
static void
sparc_print_registers (struct gdbarch *gdbarch,
struct ui_file *file,
struct frame_info *frame,
int regnum, int print_all,
void (*print_register_hook) (int))
{
int i;
const int numregs = NUM_REGS + NUM_PSEUDO_REGS;
char raw_buffer[MAX_REGISTER_SIZE];
char virtual_buffer[MAX_REGISTER_SIZE];
for (i = 0; i < numregs; i++)
{
/* Decide between printing all regs, non-float / vector regs, or
specific reg. */
if (regnum == -1)
{
if (!print_all)
{
if (TYPE_CODE (DEPRECATED_REGISTER_VIRTUAL_TYPE (i)) == TYPE_CODE_FLT)
continue;
if (TYPE_VECTOR (DEPRECATED_REGISTER_VIRTUAL_TYPE (i)))
continue;
}
}
else
{
if (i != regnum)
continue;
}
/* If the register name is empty, it is undefined for this
processor, so don't display anything. */
if (REGISTER_NAME (i) == NULL || *(REGISTER_NAME (i)) == '\0')
continue;
fputs_filtered (REGISTER_NAME (i), file);
print_spaces_filtered (15 - strlen (REGISTER_NAME (i)), file);
/* Get the data in raw format. */
if (! frame_register_read (frame, i, raw_buffer))
{
fprintf_filtered (file, "*value not available*\n");
continue;
}
memcpy (virtual_buffer, raw_buffer, DEPRECATED_REGISTER_VIRTUAL_SIZE (i));
/* If virtual format is floating, print it that way, and in raw
hex. */
if (TYPE_CODE (DEPRECATED_REGISTER_VIRTUAL_TYPE (i)) == TYPE_CODE_FLT)
{
int j;
val_print (DEPRECATED_REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0,
file, 0, 1, 0, Val_pretty_default);
fprintf_filtered (file, "\t(raw 0x");
for (j = 0; j < DEPRECATED_REGISTER_RAW_SIZE (i); j++)
{
int idx;
if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
idx = j;
else
idx = DEPRECATED_REGISTER_RAW_SIZE (i) - 1 - j;
fprintf_filtered (file, "%02x", (unsigned char) raw_buffer[idx]);
}
fprintf_filtered (file, ")");
}
else
{
/* Print the register in hex. */
val_print (DEPRECATED_REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0,
file, 'x', 1, 0, Val_pretty_default);
/* If not a vector register, print it also according to its
natural format. */
if (TYPE_VECTOR (DEPRECATED_REGISTER_VIRTUAL_TYPE (i)) == 0)
{
fprintf_filtered (file, "\t");
val_print (DEPRECATED_REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, 0,
file, 0, 1, 0, Val_pretty_default);
}
}
/* Some sparc specific info. */
if (print_register_hook != NULL)
print_register_hook (i);
fprintf_filtered (file, "\n");
}
}
static void
sparc_print_registers_info (struct gdbarch *gdbarch,
struct ui_file *file,
struct frame_info *frame,
int regnum, int print_all)
{
sparc_print_registers (gdbarch, file, frame, regnum, print_all,
sparc_print_register_hook);
}
void
sparc_do_registers_info (int regnum, int all)
{
sparc_print_registers_info (current_gdbarch, gdb_stdout, deprecated_selected_frame,
regnum, all);
}
#define SPARC_F0_REGNUM FP0_REGNUM /* %f0 */
#define SPARC_F1_REGNUM (FP0_REGNUM + 1)/* %f1 */
#define SPARC_O0_REGNUM O0_REGNUM /* %o0 */
#define SPARC_O1_REGNUM O1_REGNUM /* %o1 */
/* Push the arguments onto the stack and into the appropriate registers. */
static CORE_ADDR
sparc32_do_push_arguments (struct regcache *regcache, int nargs,
struct value **args, CORE_ADDR sp)
{
CORE_ADDR *addr;
int size = 0;
int i;
/* Structure, union and quad-precision arguments are passed by
reference. We allocate space for these arguments on the stack
and record their addresses in an array. Array elements for
arguments that are passed by value will be set to zero.*/
addr = alloca (nargs * sizeof (CORE_ADDR));
for (i = nargs - 1; i >= 0; i--)
{
struct type *type = VALUE_ENCLOSING_TYPE (args[i]);
enum type_code code = TYPE_CODE (type);
int len = TYPE_LENGTH (type);
/* Push the contents of structure, union and quad-precision
arguments on the stack. */
if (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION || len > 8)
{
/* Keep the stack doubleword aligned. */
sp -= (len + 7) & ~7;
write_memory (sp, VALUE_CONTENTS_ALL (args[i]), len);
addr[i] = sp;
size += 4;
}
else
{
addr[i] = 0;
size += (len > 4) ? 8 : 4;
}
}
/* The needed space for outgoing arguments should be a multiple of 4. */
gdb_assert (size % 4 == 0);
/* Make sure we reserve space for the first six words of arguments
in the stack frame, even if we don't need them. */
if (size < 24)
sp -= (24 - size);
/* Make sure we end up with a doubleword aligned stack in the end.
Reserve an extra word if necessary in order to accomplish this. */
if ((sp - size) % 8 == 0)
sp -= 4;
/* Now push the arguments onto the stack. */
for (i = nargs - 1; i >=0; i--)
{
char buf[8];
int len;
if (addr[i])
{
store_unsigned_integer (buf, 4, addr[i]);
len = 4;
}
else
{
struct value *arg = args[i];
len = TYPE_LENGTH (VALUE_ENCLOSING_TYPE (arg));
/* Expand signed and unsigned bytes and halfwords as needed. */
if (len < 4)
{
arg = value_cast (builtin_type_long, arg);
len = 4;
}
else if (len > 4 && len < 8)
{
arg = value_cast (builtin_type_long_long, arg);
len = 4;
}
gdb_assert (len == 4 || len == 8);
memcpy (buf, VALUE_CONTENTS_ALL (arg), len);
}
/* We always write the argument word on the stack. */
sp -= len;
write_memory (sp, buf, len);
/* If this argument occupies one of the first 6 words, write it
into the appropriate register too. */
size -= len;
if (size < 24)
{
int regnum = SPARC_O0_REGNUM + (size / 4);
regcache_cooked_write (regcache, regnum, buf);
if (len == 8 && size < 20)
regcache_cooked_write (regcache, regnum + 1, buf + 4);
}
}
/* Reserve space for the struct/union return value pointer. */
sp -= 4;
/* Stack should be doubleword aligned at this point. */
gdb_assert (sp % 8 == 0);
/* Return the adjusted stack pointer. */
return sp;
}
/* The SPARC passes the arguments on the stack; arguments smaller
than an int are promoted to an int. The first 6 words worth of
args are also passed in registers o0 - o5. */
CORE_ADDR
sparc32_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
int struct_return, CORE_ADDR struct_addr)
{
sp = sparc32_do_push_arguments (current_regcache, nargs, args, sp);
/* FIXME: kettenis/20030525: We don't let this function set the
struct/union return pointer just yet. */
#if 0
if (struct_return)
{
char buf[4];
/* The space for the struct/union return value pointer has
already been reserved. */
store_unsigned_integer (buf, 4, struct_addr);
write (sp, buf, 4);
}
return sp;
#else
return sp + 4;
#endif
}
/* Extract from REGCACHE a function return value of type TYPE and copy
that into VALBUF.
Note that REGCACHE specifies the register values for the frame of
the calling function. This means that we need to fetch the value
form %o0 and %o1, which correspond to %i0 and %i1 in the frame of
the called function. */
void
sparc32_extract_return_value (struct type *type, struct regcache *regcache,
void *valbuf)
{
int len = TYPE_LENGTH (type);
char buf[8];
if (TYPE_CODE (type) == TYPE_CODE_FLT && SPARC_HAS_FPU)
{
if (len == 4 || len == 8)
{
regcache_cooked_read (regcache, SPARC_F0_REGNUM, buf);
regcache_cooked_read (regcache, SPARC_F1_REGNUM, buf + 4);
memcpy (valbuf, buf, len);
return;
}
else
internal_error (__FILE__, __LINE__, "\
Cannot extract floating-point return value of %d bytes long.", len);
}
if (len <= 4)
{
regcache_cooked_read (regcache, SPARC_O0_REGNUM, buf);
memcpy (valbuf, buf + 4 - len, len);
}
else if (len <= 8)
{
regcache_cooked_read (regcache, SPARC_O0_REGNUM, buf);
regcache_cooked_read (regcache, SPARC_O1_REGNUM, buf + 4);
memcpy (valbuf, buf + 8 - len, len);
}
else
internal_error (__FILE__, __LINE__,
"Cannot extract return value of %d bytes long.", len);
}
/* Write into REGBUF a function return value VALBUF of type TYPE. */
void
sparc32_store_return_value (struct type *type, struct regcache *regcache,
const void *valbuf)
{
int len = TYPE_LENGTH (type);
char buf[8];
if (TYPE_CODE (type) == TYPE_CODE_FLT && SPARC_HAS_FPU)
{
const char *buf = valbuf;
if (len == 4)
{
regcache_cooked_write (regcache, SPARC_F0_REGNUM, buf);
return;
}
else if (len == 8)
{
regcache_cooked_write (regcache, SPARC_F0_REGNUM, buf);
regcache_cooked_write (regcache, SPARC_F1_REGNUM, buf + 4);
return;
}
else
internal_error (__FILE__, __LINE__, "\
Cannot extract floating-point return value of %d bytes long.", len);
}
/* Add leading zeros to the value. */
memset (buf, 0, sizeof buf);
if (len <= 4)
{
memcpy (buf + 4 - len, valbuf, len);
regcache_cooked_write (regcache, SPARC_O0_REGNUM, buf);
}
else if (len <= 8)
{
memcpy (buf + 8 - len, valbuf, len);
regcache_cooked_write (regcache, SPARC_O0_REGNUM, buf);
regcache_cooked_write (regcache, SPARC_O1_REGNUM, buf);
}
else
internal_error (__FILE__, __LINE__,
"Cannot extract return value of %d bytes long.", len);
}
/* Extract from REGCACHE the address in which a function should return
its structure value. */
CORE_ADDR
sparc_extract_struct_value_address (struct regcache *regcache)
{
ULONGEST addr;
regcache_cooked_read_unsigned (regcache, SPARC_O0_REGNUM, &addr);
return addr;
}
/* FIXME: kettenis/2003/05/24: Still used for sparc64. */
static void
sparc_store_return_value (struct type *type, char *valbuf)
{
int regno;
char buffer[MAX_REGISTER_SIZE];
if (TYPE_CODE (type) == TYPE_CODE_FLT && SPARC_HAS_FPU)
/* Floating-point values are returned in the register pair */
/* formed by %f0 and %f1 (doubles are, anyway). */
regno = FP0_REGNUM;
else
/* Other values are returned in register %o0. */
regno = O0_REGNUM;
/* Add leading zeros to the value. */
if (TYPE_LENGTH (type) < DEPRECATED_REGISTER_RAW_SIZE (regno))
{
memset (buffer, 0, DEPRECATED_REGISTER_RAW_SIZE (regno));
memcpy (buffer + DEPRECATED_REGISTER_RAW_SIZE (regno) - TYPE_LENGTH (type), valbuf,
TYPE_LENGTH (type));
deprecated_write_register_gen (regno, buffer);
}
else
deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (regno), valbuf,
TYPE_LENGTH (type));
}
#ifndef CALL_DUMMY_CALL_OFFSET
#define CALL_DUMMY_CALL_OFFSET \
(gdbarch_tdep (current_gdbarch)->call_dummy_call_offset)
#endif /* CALL_DUMMY_CALL_OFFSET */
/* Insert the function address into a call dummy instruction sequence
stored at DUMMY.
For structs and unions, if the function was compiled with Sun cc,
it expects 'unimp' after the call. But gcc doesn't use that
(twisted) convention. So leave a nop there for gcc
(DEPRECATED_FIX_CALL_DUMMY can assume it is operating on a pristine
CALL_DUMMY, not one that has already been customized for a
different function). */
void
sparc_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun,
struct type *value_type, int using_gcc)
{
int i;
/* Store the relative adddress of the target function into the
'call' instruction. */
store_unsigned_integer (dummy + CALL_DUMMY_CALL_OFFSET, 4,
(0x40000000
| (((fun - (pc + CALL_DUMMY_CALL_OFFSET)) >> 2)
& 0x3fffffff)));
/* If the called function returns an aggregate value, fill in the UNIMP
instruction containing the size of the returned aggregate return value,
which follows the call instruction.
For details see the SPARC Architecture Manual Version 8, Appendix D.3.
Adjust the call_dummy_breakpoint_offset for the bp_call_dummy breakpoint
to the proper address in the call dummy, so that `finish' after a stop
in a call dummy works.
Tweeking current_gdbarch is not an optimal solution, but the call
to sparc_fix_call_dummy is immediately followed by a call to
call_function_by_hand, which is the only function where
dummy_breakpoint_offset is actually used, if it is non-zero. */
if (TYPE_CODE (value_type) == TYPE_CODE_STRUCT
|| TYPE_CODE (value_type) == TYPE_CODE_UNION)
{
store_unsigned_integer (dummy + CALL_DUMMY_CALL_OFFSET + 8, 4,
TYPE_LENGTH (value_type) & 0x1fff);
set_gdbarch_deprecated_call_dummy_breakpoint_offset (current_gdbarch, 0x30);
}
else
set_gdbarch_deprecated_call_dummy_breakpoint_offset (current_gdbarch, 0x2c);
if (!(GDB_TARGET_IS_SPARC64))
{
/* If this is not a simulator target, change the first four
instructions of the call dummy to NOPs. Those instructions
include a 'save' instruction and are designed to work around
problems with register window flushing in the simulator. */
if (strcmp (target_shortname, "sim") != 0)
{
for (i = 0; i < 4; i++)
store_unsigned_integer (dummy + (i * 4), 4, 0x01000000);
}
}
}
/*
* Module "constructor" function.
*/
static struct gdbarch * sparc_gdbarch_init (struct gdbarch_info info,
struct gdbarch_list *arches);
static void sparc_dump_tdep (struct gdbarch *, struct ui_file *);
extern initialize_file_ftype _initialize_sparc_tdep; /* -Wmissing-prototypes */
void
_initialize_sparc_tdep (void)
{
/* Hook us into the gdbarch mechanism. */
gdbarch_register (bfd_arch_sparc, sparc_gdbarch_init, sparc_dump_tdep);
}
/* Compensate for stack bias. Note that we currently don't handle
mixed 32/64 bit code. */
static CORE_ADDR
sparc64_read_sp (void)
{
CORE_ADDR sp = read_register (SP_REGNUM);
if (sp & 1)
sp += 2047;
return sp;
}
static CORE_ADDR
sparc64_read_fp (void)
{
CORE_ADDR fp = read_register (DEPRECATED_FP_REGNUM);
if (fp & 1)
fp += 2047;
return fp;
}
static void
sparc64_write_sp (CORE_ADDR val)
{
CORE_ADDR oldsp = read_register (SP_REGNUM);
if (oldsp & 1)
write_register (SP_REGNUM, val - 2047);
else
write_register (SP_REGNUM, val);
}
/* The SPARC 64 ABI passes floating-point arguments in FP0 to FP31,
and all other arguments in O0 to O5. They are also copied onto
the stack in the correct places. Apparently (empirically),
structs of less than 16 bytes are passed member-by-member in
separate registers, but I am unable to figure out the algorithm.
Some members go in floating point regs, but I don't know which.
FIXME: Handle small structs (less than 16 bytes containing floats).
The counting regimen for using both integer and FP registers
for argument passing is rather odd -- a single counter is used
for both; this means that if the arguments alternate between
int and float, we will waste every other register of both types. */
static CORE_ADDR
sparc64_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
int struct_return, CORE_ADDR struct_retaddr)
{
int i, j, register_counter = 0;
CORE_ADDR tempsp;
struct type *sparc_intreg_type =
TYPE_LENGTH (builtin_type_long) == SPARC_INTREG_SIZE ?
builtin_type_long : builtin_type_long_long;
sp = (sp & ~(((unsigned long) SPARC_INTREG_SIZE) - 1UL));
/* Figure out how much space we'll need. */
for (i = nargs - 1; i >= 0; i--)
{
int len = TYPE_LENGTH (check_typedef (VALUE_TYPE (args[i])));
struct value *copyarg = args[i];
int copylen = len;
if (copylen < SPARC_INTREG_SIZE)
{
copyarg = value_cast (sparc_intreg_type, copyarg);
copylen = SPARC_INTREG_SIZE;
}
sp -= copylen;
}
/* Round down. */
sp = sp & ~7;
tempsp = sp;
/* if STRUCT_RETURN, then first argument is the struct return location. */
if (struct_return)
write_register (O0_REGNUM + register_counter++, struct_retaddr);
/* Now write the arguments onto the stack, while writing FP
arguments into the FP registers, and other arguments into the
first six 'O' registers. */
for (i = 0; i < nargs; i++)
{
int len = TYPE_LENGTH (check_typedef (VALUE_TYPE (args[i])));
struct value *copyarg = args[i];
enum type_code typecode = TYPE_CODE (VALUE_TYPE (args[i]));
int copylen = len;
if (typecode == TYPE_CODE_INT ||
typecode == TYPE_CODE_BOOL ||
typecode == TYPE_CODE_CHAR ||
typecode == TYPE_CODE_RANGE ||
typecode == TYPE_CODE_ENUM)
if (len < SPARC_INTREG_SIZE)
{
/* Small ints will all take up the size of one intreg on
the stack. */
copyarg = value_cast (sparc_intreg_type, copyarg);
copylen = SPARC_INTREG_SIZE;
}
write_memory (tempsp, VALUE_CONTENTS (copyarg), copylen);
tempsp += copylen;
/* Corner case: Structs consisting of a single float member are floats.
* FIXME! I don't know about structs containing multiple floats!
* Structs containing mixed floats and ints are even more weird.
*/
/* Separate float args from all other args. */
if (typecode == TYPE_CODE_FLT && SPARC_HAS_FPU)
{
if (register_counter < 16)
{
/* This arg gets copied into a FP register. */
int fpreg;
switch (len) {
case 4: /* Single-precision (float) */
fpreg = FP0_REGNUM + 2 * register_counter + 1;
register_counter += 1;
break;
case 8: /* Double-precision (double) */
fpreg = FP0_REGNUM + 2 * register_counter;
register_counter += 1;
break;
case 16: /* Quad-precision (long double) */
fpreg = FP0_REGNUM + 2 * register_counter;
register_counter += 2;
break;
default:
internal_error (__FILE__, __LINE__, "bad switch");
}
deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (fpreg),
VALUE_CONTENTS (args[i]),
len);
}
}
else /* all other args go into the first six 'o' registers */
{
for (j = 0;
j < len && register_counter < 6;
j += SPARC_INTREG_SIZE)
{
int oreg = O0_REGNUM + register_counter;
deprecated_write_register_gen (oreg, VALUE_CONTENTS (copyarg) + j);
register_counter += 1;
}
}
}
return sp;
}
/* Values <= 32 bytes are returned in o0-o3 (floating-point values are
returned in f0-f3). */
static void
sp64_extract_return_value (struct type *type, char *regbuf, char *valbuf,
int bitoffset)
{
int typelen = TYPE_LENGTH (type);
int regsize = DEPRECATED_REGISTER_RAW_SIZE (O0_REGNUM);
if (TYPE_CODE (type) == TYPE_CODE_FLT && SPARC_HAS_FPU)
{
memcpy (valbuf, &regbuf[DEPRECATED_REGISTER_BYTE (FP0_REGNUM)], typelen);
return;
}
if (TYPE_CODE (type) != TYPE_CODE_STRUCT
|| (TYPE_LENGTH (type) > 32))
{
memcpy (valbuf,
&regbuf[O0_REGNUM * regsize +
(typelen >= regsize ? 0 : regsize - typelen)],
typelen);
return;
}
else
{
char *o0 = &regbuf[O0_REGNUM * regsize];
char *f0 = &regbuf[FP0_REGNUM * regsize];
int x;
for (x = 0; x < TYPE_NFIELDS (type); x++)
{
struct field *f = &TYPE_FIELDS (type)[x];
/* FIXME: We may need to handle static fields here. */
int whichreg = (f->loc.bitpos + bitoffset) / 32;
int remainder = ((f->loc.bitpos + bitoffset) % 32) / 8;
int where = (f->loc.bitpos + bitoffset) / 8;
int size = TYPE_LENGTH (f->type);
int typecode = TYPE_CODE (f->type);
if (typecode == TYPE_CODE_STRUCT)
{
sp64_extract_return_value (f->type,
regbuf,
valbuf,
bitoffset + f->loc.bitpos);
}
else if (typecode == TYPE_CODE_FLT && SPARC_HAS_FPU)
{
memcpy (valbuf + where, &f0[whichreg * 4] + remainder, size);
}
else
{
memcpy (valbuf + where, &o0[whichreg * 4] + remainder, size);
}
}
}
}
static void
sparc64_extract_return_value (struct type *type, char *regbuf, char *valbuf)
{
sp64_extract_return_value (type, regbuf, valbuf, 0);
}
extern CORE_ADDR
sparc32_stack_align (CORE_ADDR addr)
{
return ((addr + 7) & -8);
}
static CORE_ADDR
sparc64_stack_align (CORE_ADDR addr)
{
return ((addr + 15) & -16);
}
extern void
sparc_print_extra_frame_info (struct frame_info *fi)
{
if (fi && get_frame_extra_info (fi) && get_frame_extra_info (fi)->flat)
printf_filtered (" flat, pc saved at 0x%s, fp saved at 0x%s\n",
paddr_nz (get_frame_extra_info (fi)->pc_addr),
paddr_nz (get_frame_extra_info (fi)->fp_addr));
}
static const char *
sparc32_register_name (int regno)
{
static char *register_names[] =
{ "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7",
"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
"y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr"
};
if (regno < 0 ||
regno >= (sizeof (register_names) / sizeof (register_names[0])))
return NULL;
else
return register_names[regno];
}
static const char *
sparc64_register_name (int regno)
{
static char *register_names[] =
{ "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7",
"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
"f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46",
"f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62",
"pc", "npc", "ccr", "fsr", "fprs", "y", "asi", "ver",
"tick", "pil", "pstate", "tstate", "tba", "tl", "tt", "tpc",
"tnpc", "wstate", "cwp", "cansave", "canrestore", "cleanwin", "otherwin",
"asr16", "asr17", "asr18", "asr19", "asr20", "asr21", "asr22", "asr23",
"asr24", "asr25", "asr26", "asr27", "asr28", "asr29", "asr30", "asr31",
/* These are here at the end to simplify removing them if we have to. */
"icc", "xcc", "fcc0", "fcc1", "fcc2", "fcc3"
};
if (regno < 0 ||
regno >= (sizeof (register_names) / sizeof (register_names[0])))
return NULL;
else
return register_names[regno];
}
static CORE_ADDR
sparc_push_return_address (CORE_ADDR pc_unused, CORE_ADDR sp)
{
if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT)
{
/* The return PC of the dummy_frame is the former 'current' PC
(where we were before we made the target function call).
This is saved in %i7 by push_dummy_frame.
We will save the 'call dummy location' (ie. the address
to which the target function will return) in %o7.
This address will actually be the program's entry point.
There will be a special call_dummy breakpoint there. */
if (DEPRECATED_CALL_DUMMY_ADDRESS_P ())
write_register (O7_REGNUM, DEPRECATED_CALL_DUMMY_ADDRESS () - 8);
else
write_register (O7_REGNUM, entry_point_address () - 8);
}
return sp;
}
/* Should call_function allocate stack space for a struct return? */
static int
sparc64_use_struct_convention (int gcc_p, struct type *type)
{
return (TYPE_LENGTH (type) > 32);
}
/* Store the address of the place in which to copy the structure the
subroutine will return. This is called from call_function_by_hand.
The ultimate mystery is, tho, what is the value "16"?
MVS: That's the offset from where the sp is now, to where the
subroutine is gonna expect to find the struct return address. */
static void
sparc32_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
{
char *val;
CORE_ADDR o7;
val = alloca (SPARC_INTREG_SIZE);
store_unsigned_integer (val, SPARC_INTREG_SIZE, addr);
write_memory (sp + (16 * SPARC_INTREG_SIZE), val, SPARC_INTREG_SIZE);
if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT)
{
/* Now adjust the value of the link register, which was previously
stored by push_return_address. Functions that return structs are
peculiar in that they return to link register + 12, rather than
link register + 8. */
o7 = read_register (O7_REGNUM);
write_register (O7_REGNUM, o7 - 4);
}
}
static void
sparc64_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
{
/* FIXME: V9 uses %o0 for this. */
/* FIXME MVS: Only for small enough structs!!! */
target_write_memory (sp + (16 * SPARC_INTREG_SIZE),
(char *) &addr, SPARC_INTREG_SIZE);
#if 0
if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT)
{
/* Now adjust the value of the link register, which was previously
stored by push_return_address. Functions that return structs are
peculiar in that they return to link register + 12, rather than
link register + 8. */
write_register (O7_REGNUM, read_register (O7_REGNUM) - 4);
}
#endif
}
/* Default target data type for register REGNO. */
static struct type *
sparc32_register_virtual_type (int regno)
{
if (regno == PC_REGNUM ||
regno == DEPRECATED_FP_REGNUM ||
regno == SP_REGNUM)
return builtin_type_unsigned_int;
if (regno < 32)
return builtin_type_int;
if (regno < 64)
return builtin_type_float;
return builtin_type_int;
}
static struct type *
sparc64_register_virtual_type (int regno)
{
if (regno == PC_REGNUM ||
regno == DEPRECATED_FP_REGNUM ||
regno == SP_REGNUM)
return builtin_type_unsigned_long_long;
if (regno < 32)
return builtin_type_long_long;
if (regno < 64)
return builtin_type_float;
if (regno < 80)
return builtin_type_double;
return builtin_type_long_long;
}
/* Number of bytes of storage in the actual machine representation for
register REGNO. */
static int
sparc32_register_size (int regno)
{
return 4;
}
static int
sparc64_register_size (int regno)
{
return (regno < 32 ? 8 : regno < 64 ? 4 : 8);
}
/* Index within the `registers' buffer of the first byte of the space
for register REGNO. */
static int
sparc32_register_byte (int regno)
{
return (regno * 4);
}
static int
sparc64_register_byte (int regno)
{
if (regno < 32)
return regno * 8;
else if (regno < 64)
return 32 * 8 + (regno - 32) * 4;
else if (regno < 80)
return 32 * 8 + 32 * 4 + (regno - 64) * 8;
else
return 64 * 8 + (regno - 80) * 8;
}
/* Immediately after a function call, return the saved pc.
Can't go through the frames for this because on some machines
the new frame is not set up until the new function executes
some instructions. */
static CORE_ADDR
sparc_saved_pc_after_call (struct frame_info *fi)
{
return sparc_pc_adjust (read_register (RP_REGNUM));
}
/* Init saved regs: nothing to do, just a place-holder function. */
static void
sparc_frame_init_saved_regs (struct frame_info *fi_ignored)
{ /* no-op */
}
/* gdbarch fix call dummy:
All this function does is rearrange the arguments before calling
sparc_fix_call_dummy (which does the real work). */
static void
sparc_gdbarch_fix_call_dummy (char *dummy,
CORE_ADDR pc,
CORE_ADDR fun,
int nargs,
struct value **args,
struct type *type,
int gcc_p)
{
if (CALL_DUMMY_LOCATION == ON_STACK)
sparc_fix_call_dummy (dummy, pc, fun, type, gcc_p);
}
/* DEPRECATED_CALL_DUMMY_ADDRESS: fetch the breakpoint address for a
call dummy. */
static CORE_ADDR
sparc_call_dummy_address (void)
{
return (DEPRECATED_CALL_DUMMY_START_OFFSET) + DEPRECATED_CALL_DUMMY_BREAKPOINT_OFFSET;
}
/* Supply the Y register number to those that need it. */
int
sparc_y_regnum (void)
{
return gdbarch_tdep (current_gdbarch)->y_regnum;
}
int
sparc_reg_struct_has_addr (int gcc_p, struct type *type)
{
if (GDB_TARGET_IS_SPARC64)
return (TYPE_LENGTH (type) > 32);
else
return (gcc_p != 1);
}
int
sparc_intreg_size (void)
{
return SPARC_INTREG_SIZE;
}
static int
sparc_return_value_on_stack (struct type *type)
{
if (TYPE_CODE (type) == TYPE_CODE_FLT &&
TYPE_LENGTH (type) > 8)
return 1;
else
return 0;
}
/* Get the ith function argument for the current function. */
static CORE_ADDR
sparc_fetch_pointer_argument (struct frame_info *frame, int argi,
struct type *type)
{
CORE_ADDR addr;
get_frame_register (frame, O0_REGNUM + argi, &addr);
return addr;
}
/*
* Gdbarch "constructor" function.
*/
#define SPARC32_CALL_DUMMY_ON_STACK
#define SPARC_SP_REGNUM 14
#define SPARC_FP_REGNUM 30
#define SPARC_FP0_REGNUM 32
#define SPARC32_NPC_REGNUM 69
#define SPARC32_PC_REGNUM 68
#define SPARC32_Y_REGNUM 64
#define SPARC64_PC_REGNUM 80
#define SPARC64_NPC_REGNUM 81
#define SPARC64_Y_REGNUM 85
static struct gdbarch *
sparc_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
struct gdbarch *gdbarch;
struct gdbarch_tdep *tdep;
static LONGEST call_dummy_32[] =
{ 0xbc100001, 0x9de38000, 0xbc100002, 0xbe100003,
0xda03a058, 0xd803a054, 0xd603a050, 0xd403a04c,
0xd203a048, 0x40000000, 0xd003a044, 0x01000000,
0x91d02001, 0x01000000
};
static LONGEST call_dummy_64[] =
{ 0x9de3bec0fd3fa7f7LL, 0xf93fa7eff53fa7e7LL,
0xf13fa7dfed3fa7d7LL, 0xe93fa7cfe53fa7c7LL,
0xe13fa7bfdd3fa7b7LL, 0xd93fa7afd53fa7a7LL,
0xd13fa79fcd3fa797LL, 0xc93fa78fc53fa787LL,
0xc13fa77fcc3fa777LL, 0xc83fa76fc43fa767LL,
0xc03fa75ffc3fa757LL, 0xf83fa74ff43fa747LL,
0xf03fa73f01000000LL, 0x0100000001000000LL,
0x0100000091580000LL, 0xd027a72b93500000LL,
0xd027a72791480000LL, 0xd027a72391400000LL,
0xd027a71fda5ba8a7LL, 0xd85ba89fd65ba897LL,
0xd45ba88fd25ba887LL, 0x9fc02000d05ba87fLL,
0x0100000091d02001LL, 0x0100000001000000LL
};
static LONGEST call_dummy_nil[] = {0};
/* Try to determine the OS ABI of the object we are loading. */
if (info.abfd != NULL
&& info.osabi == GDB_OSABI_UNKNOWN)
{
/* If it's an ELF file, assume it's Solaris. */
if (bfd_get_flavour (info.abfd) == bfd_target_elf_flavour)
info.osabi = GDB_OSABI_SOLARIS;
}
/* First see if there is already a gdbarch that can satisfy the request. */
arches = gdbarch_list_lookup_by_info (arches, &info);
if (arches != NULL)
return arches->gdbarch;
/* None found: is the request for a sparc architecture? */
if (info.bfd_arch_info->arch != bfd_arch_sparc)
return NULL; /* No; then it's not for us. */
/* Yes: create a new gdbarch for the specified machine type. */
tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep));
gdbarch = gdbarch_alloc (&info, tdep);
/* First set settings that are common for all sparc architectures. */
set_gdbarch_believe_pcc_promotion (gdbarch, 1);
set_gdbarch_breakpoint_from_pc (gdbarch, sparc_breakpoint_from_pc);
set_gdbarch_decr_pc_after_break (gdbarch, 0);
set_gdbarch_double_bit (gdbarch, 8 * TARGET_CHAR_BIT);
set_gdbarch_extract_struct_value_address (gdbarch,
sparc_extract_struct_value_address);
set_gdbarch_deprecated_fix_call_dummy (gdbarch, sparc_gdbarch_fix_call_dummy);
set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT);
set_gdbarch_deprecated_fp_regnum (gdbarch, SPARC_FP_REGNUM);
set_gdbarch_fp0_regnum (gdbarch, SPARC_FP0_REGNUM);
set_gdbarch_deprecated_frame_chain (gdbarch, sparc_frame_chain);
set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, sparc_frame_init_saved_regs);
set_gdbarch_deprecated_frame_saved_pc (gdbarch, sparc_frame_saved_pc);
set_gdbarch_frameless_function_invocation (gdbarch,
frameless_look_for_prologue);
set_gdbarch_deprecated_get_saved_register (gdbarch, sparc_get_saved_register);
set_gdbarch_deprecated_init_extra_frame_info (gdbarch, sparc_init_extra_frame_info);
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
set_gdbarch_int_bit (gdbarch, 4 * TARGET_CHAR_BIT);
set_gdbarch_long_double_bit (gdbarch, 16 * TARGET_CHAR_BIT);
set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT);
set_gdbarch_deprecated_max_register_raw_size (gdbarch, 8);
set_gdbarch_deprecated_max_register_virtual_size (gdbarch, 8);
set_gdbarch_deprecated_pop_frame (gdbarch, sparc_pop_frame);
set_gdbarch_deprecated_push_return_address (gdbarch, sparc_push_return_address);
set_gdbarch_deprecated_push_dummy_frame (gdbarch, sparc_push_dummy_frame);
set_gdbarch_deprecated_reg_struct_has_addr
(gdbarch, sparc_reg_struct_has_addr);
set_gdbarch_return_value_on_stack (gdbarch, sparc_return_value_on_stack);
set_gdbarch_deprecated_saved_pc_after_call (gdbarch, sparc_saved_pc_after_call);
set_gdbarch_prologue_frameless_p (gdbarch, sparc_prologue_frameless_p);
set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT);
set_gdbarch_skip_prologue (gdbarch, sparc_skip_prologue);
set_gdbarch_sp_regnum (gdbarch, SPARC_SP_REGNUM);
set_gdbarch_deprecated_use_generic_dummy_frames (gdbarch, 0);
set_gdbarch_write_pc (gdbarch, generic_target_write_pc);
/* Helper for function argument information. */
set_gdbarch_fetch_pointer_argument (gdbarch, sparc_fetch_pointer_argument);
/*
* Settings that depend only on 32/64 bit word size
*/
switch (info.bfd_arch_info->mach)
{
case bfd_mach_sparc:
case bfd_mach_sparc_v8plus:
case bfd_mach_sparc_v8plusa:
/* 32-bit machine types: */
#ifdef SPARC32_CALL_DUMMY_ON_STACK
set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_on_stack);
set_gdbarch_deprecated_call_dummy_address (gdbarch, sparc_call_dummy_address);
set_gdbarch_deprecated_call_dummy_breakpoint_offset (gdbarch, 0x30);
set_gdbarch_deprecated_call_dummy_length (gdbarch, 0x38);
/* NOTE: cagney/2003-05-01: Using the just added push_dummy_code
architecture method, it is now possible to implement a
generic dummy frames based inferior function call that stores
the breakpoint (and struct info) on the stack. Further, by
treating a SIGSEG at a breakpoint as equivalent to a SIGTRAP
it is even possible to make this work when the stack is
no-execute.
NOTE: cagney/2002-04-26: Based from info posted by Peter
Schauer around Oct '99. Briefly, due to aspects of the SPARC
ABI, it isn't possible to use ON_STACK with a strictly
compliant compiler.
Peter Schauer writes ...
No, any call from GDB to a user function returning a
struct/union will fail miserably. Try this:
*NOINDENT*
struct x
{
int a[4];
};
struct x gx;
struct x
sret ()
{
return gx;
}
main ()
{
int i;
for (i = 0; i < 4; i++)
gx.a[i] = i + 1;
gx = sret ();
}
*INDENT*
Set a breakpoint at the gx = sret () statement, run to it and
issue a `print sret()'. It will not succed with your
approach, and I doubt that continuing the program will work
as well.
For details of the ABI see the Sparc Architecture Manual. I
have Version 8 (Prentice Hall ISBN 0-13-825001-4) and the
calling conventions for functions returning aggregate values
are explained in Appendix D.3. */
set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
set_gdbarch_deprecated_call_dummy_words (gdbarch, call_dummy_32);
#else
set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point);
set_gdbarch_deprecated_call_dummy_words (gdbarch, call_dummy_nil);
#endif
set_gdbarch_deprecated_call_dummy_stack_adjust (gdbarch, 68);
set_gdbarch_frame_args_skip (gdbarch, 68);
set_gdbarch_function_start_offset (gdbarch, 0);
set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT);
set_gdbarch_deprecated_npc_regnum (gdbarch, SPARC32_NPC_REGNUM);
set_gdbarch_pc_regnum (gdbarch, SPARC32_PC_REGNUM);
set_gdbarch_ptr_bit (gdbarch, 4 * TARGET_CHAR_BIT);
set_gdbarch_deprecated_push_arguments (gdbarch, sparc32_push_arguments);
set_gdbarch_deprecated_register_byte (gdbarch, sparc32_register_byte);
set_gdbarch_deprecated_register_raw_size (gdbarch, sparc32_register_size);
set_gdbarch_deprecated_register_size (gdbarch, 4);
set_gdbarch_deprecated_register_virtual_size (gdbarch, sparc32_register_size);
set_gdbarch_deprecated_register_virtual_type (gdbarch, sparc32_register_virtual_type);
#ifdef SPARC32_CALL_DUMMY_ON_STACK
set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof (call_dummy_32));
#else
set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, 0);
#endif
set_gdbarch_deprecated_stack_align (gdbarch, sparc32_stack_align);
set_gdbarch_deprecated_extra_stack_alignment_needed (gdbarch, 1);
set_gdbarch_deprecated_store_struct_return (gdbarch, sparc32_store_struct_return);
set_gdbarch_use_struct_convention (gdbarch,
generic_use_struct_convention);
set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp);
tdep->y_regnum = SPARC32_Y_REGNUM;
tdep->fp_max_regnum = SPARC_FP0_REGNUM + 32;
tdep->intreg_size = 4;
tdep->reg_save_offset = 0x60;
tdep->call_dummy_call_offset = 0x24;
break;
case bfd_mach_sparc_v9:
case bfd_mach_sparc_v9a:
/* 64-bit machine types: */
default: /* Any new machine type is likely to be 64-bit. */
#ifdef SPARC64_CALL_DUMMY_ON_STACK
set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_on_stack);
set_gdbarch_deprecated_call_dummy_address (gdbarch, sparc_call_dummy_address);
set_gdbarch_deprecated_call_dummy_breakpoint_offset (gdbarch, 8 * 4);
set_gdbarch_deprecated_call_dummy_length (gdbarch, 192);
set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
set_gdbarch_deprecated_call_dummy_start_offset (gdbarch, 148);
set_gdbarch_deprecated_call_dummy_words (gdbarch, call_dummy_64);
#else
set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point);
set_gdbarch_deprecated_call_dummy_words (gdbarch, call_dummy_nil);
#endif
set_gdbarch_deprecated_call_dummy_stack_adjust (gdbarch, 128);
set_gdbarch_frame_args_skip (gdbarch, 136);
set_gdbarch_function_start_offset (gdbarch, 0);
set_gdbarch_long_bit (gdbarch, 8 * TARGET_CHAR_BIT);
set_gdbarch_deprecated_npc_regnum (gdbarch, SPARC64_NPC_REGNUM);
set_gdbarch_pc_regnum (gdbarch, SPARC64_PC_REGNUM);
set_gdbarch_ptr_bit (gdbarch, 8 * TARGET_CHAR_BIT);
set_gdbarch_deprecated_push_arguments (gdbarch, sparc64_push_arguments);
/* NOTE different for at_entry */
set_gdbarch_deprecated_target_read_fp (gdbarch, sparc64_read_fp);
set_gdbarch_read_sp (gdbarch, sparc64_read_sp);
/* Some of the registers aren't 64 bits, but it's a lot simpler just
to assume they all are (since most of them are). */
set_gdbarch_deprecated_register_byte (gdbarch, sparc64_register_byte);
set_gdbarch_deprecated_register_raw_size (gdbarch, sparc64_register_size);
set_gdbarch_deprecated_register_size (gdbarch, 8);
set_gdbarch_deprecated_register_virtual_size (gdbarch, sparc64_register_size);
set_gdbarch_deprecated_register_virtual_type (gdbarch, sparc64_register_virtual_type);
#ifdef SPARC64_CALL_DUMMY_ON_STACK
set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof (call_dummy_64));
#else
set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, 0);
#endif
set_gdbarch_deprecated_stack_align (gdbarch, sparc64_stack_align);
set_gdbarch_deprecated_extra_stack_alignment_needed (gdbarch, 1);
set_gdbarch_deprecated_store_struct_return (gdbarch, sparc64_store_struct_return);
set_gdbarch_use_struct_convention (gdbarch,
sparc64_use_struct_convention);
set_gdbarch_deprecated_dummy_write_sp (gdbarch, sparc64_write_sp);
tdep->y_regnum = SPARC64_Y_REGNUM;
tdep->fp_max_regnum = SPARC_FP0_REGNUM + 48;
tdep->intreg_size = 8;
tdep->reg_save_offset = 0x90;
tdep->call_dummy_call_offset = 148 + 4 * 5;
break;
}
/*
* Settings that vary per-architecture:
*/
switch (info.bfd_arch_info->mach)
{
case bfd_mach_sparc:
set_gdbarch_extract_return_value (gdbarch, sparc32_extract_return_value);
set_gdbarch_store_return_value (gdbarch, sparc32_store_return_value);
set_gdbarch_num_regs (gdbarch, 72);
set_gdbarch_deprecated_register_bytes (gdbarch, 32*4 + 32*4 + 8*4);
set_gdbarch_register_name (gdbarch, sparc32_register_name);
tdep->fp_register_bytes = 32 * 4;
tdep->print_insn_mach = bfd_mach_sparc;
break;
case bfd_mach_sparc_v8plus:
set_gdbarch_extract_return_value (gdbarch, sparc32_extract_return_value);
set_gdbarch_store_return_value (gdbarch, sparc32_store_return_value);
set_gdbarch_num_regs (gdbarch, 72);
set_gdbarch_deprecated_register_bytes (gdbarch, 32*4 + 32*4 + 8*4);
set_gdbarch_register_name (gdbarch, sparc32_register_name);
tdep->print_insn_mach = bfd_mach_sparc;
tdep->fp_register_bytes = 32 * 4;
break;
case bfd_mach_sparc_v8plusa:
set_gdbarch_extract_return_value (gdbarch, sparc32_extract_return_value);
set_gdbarch_store_return_value (gdbarch, sparc32_store_return_value);
set_gdbarch_num_regs (gdbarch, 72);
set_gdbarch_deprecated_register_bytes (gdbarch, 32*4 + 32*4 + 8*4);
set_gdbarch_register_name (gdbarch, sparc32_register_name);
tdep->fp_register_bytes = 32 * 4;
tdep->print_insn_mach = bfd_mach_sparc;
break;
case bfd_mach_sparc_v9:
set_gdbarch_deprecated_extract_return_value (gdbarch, sparc64_extract_return_value);
set_gdbarch_num_regs (gdbarch, 125);
set_gdbarch_deprecated_register_bytes (gdbarch, 32*8 + 32*8 + 45*8);
set_gdbarch_register_name (gdbarch, sparc64_register_name);
set_gdbarch_deprecated_store_return_value (gdbarch, sparc_store_return_value);
tdep->fp_register_bytes = 64 * 4;
tdep->print_insn_mach = bfd_mach_sparc_v9a;
break;
case bfd_mach_sparc_v9a:
set_gdbarch_deprecated_extract_return_value (gdbarch, sparc64_extract_return_value);
set_gdbarch_num_regs (gdbarch, 125);
set_gdbarch_deprecated_register_bytes (gdbarch, 32*8 + 32*8 + 45*8);
set_gdbarch_register_name (gdbarch, sparc64_register_name);
set_gdbarch_deprecated_store_return_value (gdbarch, sparc_store_return_value);
tdep->fp_register_bytes = 64 * 4;
tdep->print_insn_mach = bfd_mach_sparc_v9a;
break;
}
set_gdbarch_print_insn (gdbarch, print_insn_sparc);
/* Hook in OS ABI-specific overrides, if they have been registered. */
gdbarch_init_osabi (info, gdbarch);
return gdbarch;
}
static void
sparc_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
if (tdep == NULL)
return;
fprintf_unfiltered (file, "sparc_dump_tdep: fp_register_bytes = %d\n",
tdep->fp_register_bytes);
fprintf_unfiltered (file, "sparc_dump_tdep: y_regnum = %d\n",
tdep->y_regnum);
fprintf_unfiltered (file, "sparc_dump_tdep: fp_max_regnum = %d\n",
tdep->fp_max_regnum);
fprintf_unfiltered (file, "sparc_dump_tdep: intreg_size = %d\n",
tdep->intreg_size);
fprintf_unfiltered (file, "sparc_dump_tdep: reg_save_offset = %d\n",
tdep->reg_save_offset);
fprintf_unfiltered (file, "sparc_dump_tdep: call_dummy_call_offset = %d\n",
tdep->call_dummy_call_offset);
fprintf_unfiltered (file, "sparc_dump_tdep: print_insn_match = %d\n",
tdep->print_insn_mach);
}
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