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binutils-gdb/gdb/hppa-tdep.c
Randolph Chung 46905982ed 2004-11-30 Randolph Chung <tausq@debian.org> 
* breakpoint.c (break_at_finish_command): Delete.
	(break_at_finish_command_1): Delete.
	(break_at_finish_at_depth_command): Delete.
	(break_at_finish_at_depth_command_1): Delete.
	(tbreak_at_finish_command): Delete.
	* hppa-tdep.c (_initialize_hppa_tdep): Remove deprecated xbreak, tbreak
	and bx commands.
2004-12-01 06:54:56 +00:00

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/* Target-dependent code for the HP PA architecture, for GDB.
Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software
Foundation, Inc.
Contributed by the Center for Software Science at the
University of Utah (pa-gdb-bugs@cs.utah.edu).
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. */
#include "defs.h"
#include "bfd.h"
#include "inferior.h"
#include "regcache.h"
#include "completer.h"
#include "osabi.h"
#include "gdb_assert.h"
#include "arch-utils.h"
/* For argument passing to the inferior */
#include "symtab.h"
#include "dis-asm.h"
#include "trad-frame.h"
#include "frame-unwind.h"
#include "frame-base.h"
#include "gdbcore.h"
#include "gdbcmd.h"
#include "objfiles.h"
#include "hppa-tdep.h"
static int hppa_debug = 0;
/* Some local constants. */
static const int hppa32_num_regs = 128;
static const int hppa64_num_regs = 96;
/* hppa-specific object data -- unwind and solib info.
TODO/maybe: think about splitting this into two parts; the unwind data is
common to all hppa targets, but is only used in this file; we can register
that separately and make this static. The solib data is probably hpux-
specific, so we can create a separate extern objfile_data that is registered
by hppa-hpux-tdep.c and shared with pa64solib.c and somsolib.c. */
const struct objfile_data *hppa_objfile_priv_data = NULL;
/* Get at various relevent fields of an instruction word. */
#define MASK_5 0x1f
#define MASK_11 0x7ff
#define MASK_14 0x3fff
#define MASK_21 0x1fffff
/* Sizes (in bytes) of the native unwind entries. */
#define UNWIND_ENTRY_SIZE 16
#define STUB_UNWIND_ENTRY_SIZE 8
/* FIXME: brobecker 2002-11-07: We will likely be able to make the
following functions static, once we hppa is partially multiarched. */
int hppa_pc_requires_run_before_use (CORE_ADDR pc);
/* Handle 32/64-bit struct return conventions. */
static enum return_value_convention
hppa32_return_value (struct gdbarch *gdbarch,
struct type *type, struct regcache *regcache,
void *readbuf, const void *writebuf)
{
if (TYPE_LENGTH (type) <= 2 * 4)
{
/* The value always lives in the right hand end of the register
(or register pair)? */
int b;
int reg = TYPE_CODE (type) == TYPE_CODE_FLT ? HPPA_FP4_REGNUM : 28;
int part = TYPE_LENGTH (type) % 4;
/* The left hand register contains only part of the value,
transfer that first so that the rest can be xfered as entire
4-byte registers. */
if (part > 0)
{
if (readbuf != NULL)
regcache_cooked_read_part (regcache, reg, 4 - part,
part, readbuf);
if (writebuf != NULL)
regcache_cooked_write_part (regcache, reg, 4 - part,
part, writebuf);
reg++;
}
/* Now transfer the remaining register values. */
for (b = part; b < TYPE_LENGTH (type); b += 4)
{
if (readbuf != NULL)
regcache_cooked_read (regcache, reg, (char *) readbuf + b);
if (writebuf != NULL)
regcache_cooked_write (regcache, reg, (const char *) writebuf + b);
reg++;
}
return RETURN_VALUE_REGISTER_CONVENTION;
}
else
return RETURN_VALUE_STRUCT_CONVENTION;
}
static enum return_value_convention
hppa64_return_value (struct gdbarch *gdbarch,
struct type *type, struct regcache *regcache,
void *readbuf, const void *writebuf)
{
/* RM: Floats are returned in FR4R, doubles in FR4. Integral values
are in r28, padded on the left. Aggregates less that 65 bits are
in r28, right padded. Aggregates upto 128 bits are in r28 and
r29, right padded. */
if (TYPE_CODE (type) == TYPE_CODE_FLT
&& TYPE_LENGTH (type) <= 8)
{
/* Floats are right aligned? */
int offset = register_size (gdbarch, HPPA_FP4_REGNUM) - TYPE_LENGTH (type);
if (readbuf != NULL)
regcache_cooked_read_part (regcache, HPPA_FP4_REGNUM, offset,
TYPE_LENGTH (type), readbuf);
if (writebuf != NULL)
regcache_cooked_write_part (regcache, HPPA_FP4_REGNUM, offset,
TYPE_LENGTH (type), writebuf);
return RETURN_VALUE_REGISTER_CONVENTION;
}
else if (TYPE_LENGTH (type) <= 8 && is_integral_type (type))
{
/* Integrals are right aligned. */
int offset = register_size (gdbarch, HPPA_FP4_REGNUM) - TYPE_LENGTH (type);
if (readbuf != NULL)
regcache_cooked_read_part (regcache, 28, offset,
TYPE_LENGTH (type), readbuf);
if (writebuf != NULL)
regcache_cooked_write_part (regcache, 28, offset,
TYPE_LENGTH (type), writebuf);
return RETURN_VALUE_REGISTER_CONVENTION;
}
else if (TYPE_LENGTH (type) <= 2 * 8)
{
/* Composite values are left aligned. */
int b;
for (b = 0; b < TYPE_LENGTH (type); b += 8)
{
int part = min (8, TYPE_LENGTH (type) - b);
if (readbuf != NULL)
regcache_cooked_read_part (regcache, 28 + b / 8, 0, part,
(char *) readbuf + b);
if (writebuf != NULL)
regcache_cooked_write_part (regcache, 28 + b / 8, 0, part,
(const char *) writebuf + b);
}
return RETURN_VALUE_REGISTER_CONVENTION;
}
else
return RETURN_VALUE_STRUCT_CONVENTION;
}
/* Routines to extract various sized constants out of hppa
instructions. */
/* This assumes that no garbage lies outside of the lower bits of
value. */
int
hppa_sign_extend (unsigned val, unsigned bits)
{
return (int) (val >> (bits - 1) ? (-1 << bits) | val : val);
}
/* For many immediate values the sign bit is the low bit! */
int
hppa_low_hppa_sign_extend (unsigned val, unsigned bits)
{
return (int) ((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1);
}
/* Extract the bits at positions between FROM and TO, using HP's numbering
(MSB = 0). */
int
hppa_get_field (unsigned word, int from, int to)
{
return ((word) >> (31 - (to)) & ((1 << ((to) - (from) + 1)) - 1));
}
/* extract the immediate field from a ld{bhw}s instruction */
int
hppa_extract_5_load (unsigned word)
{
return hppa_low_hppa_sign_extend (word >> 16 & MASK_5, 5);
}
/* extract the immediate field from a break instruction */
unsigned
hppa_extract_5r_store (unsigned word)
{
return (word & MASK_5);
}
/* extract the immediate field from a {sr}sm instruction */
unsigned
hppa_extract_5R_store (unsigned word)
{
return (word >> 16 & MASK_5);
}
/* extract a 14 bit immediate field */
int
hppa_extract_14 (unsigned word)
{
return hppa_low_hppa_sign_extend (word & MASK_14, 14);
}
/* extract a 21 bit constant */
int
hppa_extract_21 (unsigned word)
{
int val;
word &= MASK_21;
word <<= 11;
val = hppa_get_field (word, 20, 20);
val <<= 11;
val |= hppa_get_field (word, 9, 19);
val <<= 2;
val |= hppa_get_field (word, 5, 6);
val <<= 5;
val |= hppa_get_field (word, 0, 4);
val <<= 2;
val |= hppa_get_field (word, 7, 8);
return hppa_sign_extend (val, 21) << 11;
}
/* extract a 17 bit constant from branch instructions, returning the
19 bit signed value. */
int
hppa_extract_17 (unsigned word)
{
return hppa_sign_extend (hppa_get_field (word, 19, 28) |
hppa_get_field (word, 29, 29) << 10 |
hppa_get_field (word, 11, 15) << 11 |
(word & 0x1) << 16, 17) << 2;
}
CORE_ADDR
hppa_symbol_address(const char *sym)
{
struct minimal_symbol *minsym;
minsym = lookup_minimal_symbol (sym, NULL, NULL);
if (minsym)
return SYMBOL_VALUE_ADDRESS (minsym);
else
return (CORE_ADDR)-1;
}
/* Compare the start address for two unwind entries returning 1 if
the first address is larger than the second, -1 if the second is
larger than the first, and zero if they are equal. */
static int
compare_unwind_entries (const void *arg1, const void *arg2)
{
const struct unwind_table_entry *a = arg1;
const struct unwind_table_entry *b = arg2;
if (a->region_start > b->region_start)
return 1;
else if (a->region_start < b->region_start)
return -1;
else
return 0;
}
static void
record_text_segment_lowaddr (bfd *abfd, asection *section, void *data)
{
if ((section->flags & (SEC_ALLOC | SEC_LOAD | SEC_READONLY))
== (SEC_ALLOC | SEC_LOAD | SEC_READONLY))
{
bfd_vma value = section->vma - section->filepos;
CORE_ADDR *low_text_segment_address = (CORE_ADDR *)data;
if (value < *low_text_segment_address)
*low_text_segment_address = value;
}
}
static void
internalize_unwinds (struct objfile *objfile, struct unwind_table_entry *table,
asection *section, unsigned int entries, unsigned int size,
CORE_ADDR text_offset)
{
/* We will read the unwind entries into temporary memory, then
fill in the actual unwind table. */
if (size > 0)
{
unsigned long tmp;
unsigned i;
char *buf = alloca (size);
CORE_ADDR low_text_segment_address;
/* For ELF targets, then unwinds are supposed to
be segment relative offsets instead of absolute addresses.
Note that when loading a shared library (text_offset != 0) the
unwinds are already relative to the text_offset that will be
passed in. */
if (gdbarch_tdep (current_gdbarch)->is_elf && text_offset == 0)
{
low_text_segment_address = -1;
bfd_map_over_sections (objfile->obfd,
record_text_segment_lowaddr,
&low_text_segment_address);
text_offset = low_text_segment_address;
}
bfd_get_section_contents (objfile->obfd, section, buf, 0, size);
/* Now internalize the information being careful to handle host/target
endian issues. */
for (i = 0; i < entries; i++)
{
table[i].region_start = bfd_get_32 (objfile->obfd,
(bfd_byte *) buf);
table[i].region_start += text_offset;
buf += 4;
table[i].region_end = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
table[i].region_end += text_offset;
buf += 4;
tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
buf += 4;
table[i].Cannot_unwind = (tmp >> 31) & 0x1;
table[i].Millicode = (tmp >> 30) & 0x1;
table[i].Millicode_save_sr0 = (tmp >> 29) & 0x1;
table[i].Region_description = (tmp >> 27) & 0x3;
table[i].reserved1 = (tmp >> 26) & 0x1;
table[i].Entry_SR = (tmp >> 25) & 0x1;
table[i].Entry_FR = (tmp >> 21) & 0xf;
table[i].Entry_GR = (tmp >> 16) & 0x1f;
table[i].Args_stored = (tmp >> 15) & 0x1;
table[i].Variable_Frame = (tmp >> 14) & 0x1;
table[i].Separate_Package_Body = (tmp >> 13) & 0x1;
table[i].Frame_Extension_Millicode = (tmp >> 12) & 0x1;
table[i].Stack_Overflow_Check = (tmp >> 11) & 0x1;
table[i].Two_Instruction_SP_Increment = (tmp >> 10) & 0x1;
table[i].Ada_Region = (tmp >> 9) & 0x1;
table[i].cxx_info = (tmp >> 8) & 0x1;
table[i].cxx_try_catch = (tmp >> 7) & 0x1;
table[i].sched_entry_seq = (tmp >> 6) & 0x1;
table[i].reserved2 = (tmp >> 5) & 0x1;
table[i].Save_SP = (tmp >> 4) & 0x1;
table[i].Save_RP = (tmp >> 3) & 0x1;
table[i].Save_MRP_in_frame = (tmp >> 2) & 0x1;
table[i].extn_ptr_defined = (tmp >> 1) & 0x1;
table[i].Cleanup_defined = tmp & 0x1;
tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
buf += 4;
table[i].MPE_XL_interrupt_marker = (tmp >> 31) & 0x1;
table[i].HP_UX_interrupt_marker = (tmp >> 30) & 0x1;
table[i].Large_frame = (tmp >> 29) & 0x1;
table[i].Pseudo_SP_Set = (tmp >> 28) & 0x1;
table[i].reserved4 = (tmp >> 27) & 0x1;
table[i].Total_frame_size = tmp & 0x7ffffff;
/* Stub unwinds are handled elsewhere. */
table[i].stub_unwind.stub_type = 0;
table[i].stub_unwind.padding = 0;
}
}
}
/* Read in the backtrace information stored in the `$UNWIND_START$' section of
the object file. This info is used mainly by find_unwind_entry() to find
out the stack frame size and frame pointer used by procedures. We put
everything on the psymbol obstack in the objfile so that it automatically
gets freed when the objfile is destroyed. */
static void
read_unwind_info (struct objfile *objfile)
{
asection *unwind_sec, *stub_unwind_sec;
unsigned unwind_size, stub_unwind_size, total_size;
unsigned index, unwind_entries;
unsigned stub_entries, total_entries;
CORE_ADDR text_offset;
struct hppa_unwind_info *ui;
struct hppa_objfile_private *obj_private;
text_offset = ANOFFSET (objfile->section_offsets, 0);
ui = (struct hppa_unwind_info *) obstack_alloc (&objfile->objfile_obstack,
sizeof (struct hppa_unwind_info));
ui->table = NULL;
ui->cache = NULL;
ui->last = -1;
/* For reasons unknown the HP PA64 tools generate multiple unwinder
sections in a single executable. So we just iterate over every
section in the BFD looking for unwinder sections intead of trying
to do a lookup with bfd_get_section_by_name.
First determine the total size of the unwind tables so that we
can allocate memory in a nice big hunk. */
total_entries = 0;
for (unwind_sec = objfile->obfd->sections;
unwind_sec;
unwind_sec = unwind_sec->next)
{
if (strcmp (unwind_sec->name, "$UNWIND_START$") == 0
|| strcmp (unwind_sec->name, ".PARISC.unwind") == 0)
{
unwind_size = bfd_section_size (objfile->obfd, unwind_sec);
unwind_entries = unwind_size / UNWIND_ENTRY_SIZE;
total_entries += unwind_entries;
}
}
/* Now compute the size of the stub unwinds. Note the ELF tools do not
use stub unwinds at the curren time. */
stub_unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_END$");
if (stub_unwind_sec)
{
stub_unwind_size = bfd_section_size (objfile->obfd, stub_unwind_sec);
stub_entries = stub_unwind_size / STUB_UNWIND_ENTRY_SIZE;
}
else
{
stub_unwind_size = 0;
stub_entries = 0;
}
/* Compute total number of unwind entries and their total size. */
total_entries += stub_entries;
total_size = total_entries * sizeof (struct unwind_table_entry);
/* Allocate memory for the unwind table. */
ui->table = (struct unwind_table_entry *)
obstack_alloc (&objfile->objfile_obstack, total_size);
ui->last = total_entries - 1;
/* Now read in each unwind section and internalize the standard unwind
entries. */
index = 0;
for (unwind_sec = objfile->obfd->sections;
unwind_sec;
unwind_sec = unwind_sec->next)
{
if (strcmp (unwind_sec->name, "$UNWIND_START$") == 0
|| strcmp (unwind_sec->name, ".PARISC.unwind") == 0)
{
unwind_size = bfd_section_size (objfile->obfd, unwind_sec);
unwind_entries = unwind_size / UNWIND_ENTRY_SIZE;
internalize_unwinds (objfile, &ui->table[index], unwind_sec,
unwind_entries, unwind_size, text_offset);
index += unwind_entries;
}
}
/* Now read in and internalize the stub unwind entries. */
if (stub_unwind_size > 0)
{
unsigned int i;
char *buf = alloca (stub_unwind_size);
/* Read in the stub unwind entries. */
bfd_get_section_contents (objfile->obfd, stub_unwind_sec, buf,
0, stub_unwind_size);
/* Now convert them into regular unwind entries. */
for (i = 0; i < stub_entries; i++, index++)
{
/* Clear out the next unwind entry. */
memset (&ui->table[index], 0, sizeof (struct unwind_table_entry));
/* Convert offset & size into region_start and region_end.
Stuff away the stub type into "reserved" fields. */
ui->table[index].region_start = bfd_get_32 (objfile->obfd,
(bfd_byte *) buf);
ui->table[index].region_start += text_offset;
buf += 4;
ui->table[index].stub_unwind.stub_type = bfd_get_8 (objfile->obfd,
(bfd_byte *) buf);
buf += 2;
ui->table[index].region_end
= ui->table[index].region_start + 4 *
(bfd_get_16 (objfile->obfd, (bfd_byte *) buf) - 1);
buf += 2;
}
}
/* Unwind table needs to be kept sorted. */
qsort (ui->table, total_entries, sizeof (struct unwind_table_entry),
compare_unwind_entries);
/* Keep a pointer to the unwind information. */
obj_private = (struct hppa_objfile_private *)
objfile_data (objfile, hppa_objfile_priv_data);
if (obj_private == NULL)
{
obj_private = (struct hppa_objfile_private *)
obstack_alloc (&objfile->objfile_obstack,
sizeof (struct hppa_objfile_private));
set_objfile_data (objfile, hppa_objfile_priv_data, obj_private);
obj_private->unwind_info = NULL;
obj_private->so_info = NULL;
obj_private->dp = 0;
}
obj_private->unwind_info = ui;
}
/* Lookup the unwind (stack backtrace) info for the given PC. We search all
of the objfiles seeking the unwind table entry for this PC. Each objfile
contains a sorted list of struct unwind_table_entry. Since we do a binary
search of the unwind tables, we depend upon them to be sorted. */
struct unwind_table_entry *
find_unwind_entry (CORE_ADDR pc)
{
int first, middle, last;
struct objfile *objfile;
struct hppa_objfile_private *priv;
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "{ find_unwind_entry 0x%s -> ",
paddr_nz (pc));
/* A function at address 0? Not in HP-UX! */
if (pc == (CORE_ADDR) 0)
{
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "NULL }\n");
return NULL;
}
ALL_OBJFILES (objfile)
{
struct hppa_unwind_info *ui;
ui = NULL;
priv = objfile_data (objfile, hppa_objfile_priv_data);
if (priv)
ui = ((struct hppa_objfile_private *) priv)->unwind_info;
if (!ui)
{
read_unwind_info (objfile);
priv = objfile_data (objfile, hppa_objfile_priv_data);
if (priv == NULL)
error ("Internal error reading unwind information.");
ui = ((struct hppa_objfile_private *) priv)->unwind_info;
}
/* First, check the cache */
if (ui->cache
&& pc >= ui->cache->region_start
&& pc <= ui->cache->region_end)
{
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "0x%s (cached) }\n",
paddr_nz ((CORE_ADDR) ui->cache));
return ui->cache;
}
/* Not in the cache, do a binary search */
first = 0;
last = ui->last;
while (first <= last)
{
middle = (first + last) / 2;
if (pc >= ui->table[middle].region_start
&& pc <= ui->table[middle].region_end)
{
ui->cache = &ui->table[middle];
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "0x%s }\n",
paddr_nz ((CORE_ADDR) ui->cache));
return &ui->table[middle];
}
if (pc < ui->table[middle].region_start)
last = middle - 1;
else
first = middle + 1;
}
} /* ALL_OBJFILES() */
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "NULL (not found) }\n");
return NULL;
}
static const unsigned char *
hppa_breakpoint_from_pc (CORE_ADDR *pc, int *len)
{
static const unsigned char breakpoint[] = {0x00, 0x01, 0x00, 0x04};
(*len) = sizeof (breakpoint);
return breakpoint;
}
/* Return the name of a register. */
static const char *
hppa32_register_name (int i)
{
static char *names[] = {
"flags", "r1", "rp", "r3",
"r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11",
"r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19",
"r20", "r21", "r22", "r23",
"r24", "r25", "r26", "dp",
"ret0", "ret1", "sp", "r31",
"sar", "pcoqh", "pcsqh", "pcoqt",
"pcsqt", "eiem", "iir", "isr",
"ior", "ipsw", "goto", "sr4",
"sr0", "sr1", "sr2", "sr3",
"sr5", "sr6", "sr7", "cr0",
"cr8", "cr9", "ccr", "cr12",
"cr13", "cr24", "cr25", "cr26",
"mpsfu_high","mpsfu_low","mpsfu_ovflo","pad",
"fpsr", "fpe1", "fpe2", "fpe3",
"fpe4", "fpe5", "fpe6", "fpe7",
"fr4", "fr4R", "fr5", "fr5R",
"fr6", "fr6R", "fr7", "fr7R",
"fr8", "fr8R", "fr9", "fr9R",
"fr10", "fr10R", "fr11", "fr11R",
"fr12", "fr12R", "fr13", "fr13R",
"fr14", "fr14R", "fr15", "fr15R",
"fr16", "fr16R", "fr17", "fr17R",
"fr18", "fr18R", "fr19", "fr19R",
"fr20", "fr20R", "fr21", "fr21R",
"fr22", "fr22R", "fr23", "fr23R",
"fr24", "fr24R", "fr25", "fr25R",
"fr26", "fr26R", "fr27", "fr27R",
"fr28", "fr28R", "fr29", "fr29R",
"fr30", "fr30R", "fr31", "fr31R"
};
if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
return NULL;
else
return names[i];
}
static const char *
hppa64_register_name (int i)
{
static char *names[] = {
"flags", "r1", "rp", "r3",
"r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11",
"r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19",
"r20", "r21", "r22", "r23",
"r24", "r25", "r26", "dp",
"ret0", "ret1", "sp", "r31",
"sar", "pcoqh", "pcsqh", "pcoqt",
"pcsqt", "eiem", "iir", "isr",
"ior", "ipsw", "goto", "sr4",
"sr0", "sr1", "sr2", "sr3",
"sr5", "sr6", "sr7", "cr0",
"cr8", "cr9", "ccr", "cr12",
"cr13", "cr24", "cr25", "cr26",
"mpsfu_high","mpsfu_low","mpsfu_ovflo","pad",
"fpsr", "fpe1", "fpe2", "fpe3",
"fr4", "fr5", "fr6", "fr7",
"fr8", "fr9", "fr10", "fr11",
"fr12", "fr13", "fr14", "fr15",
"fr16", "fr17", "fr18", "fr19",
"fr20", "fr21", "fr22", "fr23",
"fr24", "fr25", "fr26", "fr27",
"fr28", "fr29", "fr30", "fr31"
};
if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
return NULL;
else
return names[i];
}
/* This function pushes a stack frame with arguments as part of the
inferior function calling mechanism.
This is the version of the function for the 32-bit PA machines, in
which later arguments appear at lower addresses. (The stack always
grows towards higher addresses.)
We simply allocate the appropriate amount of stack space and put
arguments into their proper slots. */
static CORE_ADDR
hppa32_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
struct regcache *regcache, CORE_ADDR bp_addr,
int nargs, struct value **args, CORE_ADDR sp,
int struct_return, CORE_ADDR struct_addr)
{
/* Stack base address at which any pass-by-reference parameters are
stored. */
CORE_ADDR struct_end = 0;
/* Stack base address at which the first parameter is stored. */
CORE_ADDR param_end = 0;
/* The inner most end of the stack after all the parameters have
been pushed. */
CORE_ADDR new_sp = 0;
/* Two passes. First pass computes the location of everything,
second pass writes the bytes out. */
int write_pass;
/* Global pointer (r19) of the function we are trying to call. */
CORE_ADDR gp;
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
for (write_pass = 0; write_pass < 2; write_pass++)
{
CORE_ADDR struct_ptr = 0;
/* The first parameter goes into sp-36, each stack slot is 4-bytes.
struct_ptr is adjusted for each argument below, so the first
argument will end up at sp-36. */
CORE_ADDR param_ptr = 32;
int i;
int small_struct = 0;
for (i = 0; i < nargs; i++)
{
struct value *arg = args[i];
struct type *type = check_typedef (value_type (arg));
/* The corresponding parameter that is pushed onto the
stack, and [possibly] passed in a register. */
char param_val[8];
int param_len;
memset (param_val, 0, sizeof param_val);
if (TYPE_LENGTH (type) > 8)
{
/* Large parameter, pass by reference. Store the value
in "struct" area and then pass its address. */
param_len = 4;
struct_ptr += align_up (TYPE_LENGTH (type), 8);
if (write_pass)
write_memory (struct_end - struct_ptr, VALUE_CONTENTS (arg),
TYPE_LENGTH (type));
store_unsigned_integer (param_val, 4, struct_end - struct_ptr);
}
else if (TYPE_CODE (type) == TYPE_CODE_INT
|| TYPE_CODE (type) == TYPE_CODE_ENUM)
{
/* Integer value store, right aligned. "unpack_long"
takes care of any sign-extension problems. */
param_len = align_up (TYPE_LENGTH (type), 4);
store_unsigned_integer (param_val, param_len,
unpack_long (type,
VALUE_CONTENTS (arg)));
}
else if (TYPE_CODE (type) == TYPE_CODE_FLT)
{
/* Floating point value store, right aligned. */
param_len = align_up (TYPE_LENGTH (type), 4);
memcpy (param_val, VALUE_CONTENTS (arg), param_len);
}
else
{
param_len = align_up (TYPE_LENGTH (type), 4);
/* Small struct value are stored right-aligned. */
memcpy (param_val + param_len - TYPE_LENGTH (type),
VALUE_CONTENTS (arg), TYPE_LENGTH (type));
/* Structures of size 5, 6 and 7 bytes are special in that
the higher-ordered word is stored in the lower-ordered
argument, and even though it is a 8-byte quantity the
registers need not be 8-byte aligned. */
if (param_len > 4 && param_len < 8)
small_struct = 1;
}
param_ptr += param_len;
if (param_len == 8 && !small_struct)
param_ptr = align_up (param_ptr, 8);
/* First 4 non-FP arguments are passed in gr26-gr23.
First 4 32-bit FP arguments are passed in fr4L-fr7L.
First 2 64-bit FP arguments are passed in fr5 and fr7.
The rest go on the stack, starting at sp-36, towards lower
addresses. 8-byte arguments must be aligned to a 8-byte
stack boundary. */
if (write_pass)
{
write_memory (param_end - param_ptr, param_val, param_len);
/* There are some cases when we don't know the type
expected by the callee (e.g. for variadic functions), so
pass the parameters in both general and fp regs. */
if (param_ptr <= 48)
{
int grreg = 26 - (param_ptr - 36) / 4;
int fpLreg = 72 + (param_ptr - 36) / 4 * 2;
int fpreg = 74 + (param_ptr - 32) / 8 * 4;
regcache_cooked_write (regcache, grreg, param_val);
regcache_cooked_write (regcache, fpLreg, param_val);
if (param_len > 4)
{
regcache_cooked_write (regcache, grreg + 1,
param_val + 4);
regcache_cooked_write (regcache, fpreg, param_val);
regcache_cooked_write (regcache, fpreg + 1,
param_val + 4);
}
}
}
}
/* Update the various stack pointers. */
if (!write_pass)
{
struct_end = sp + align_up (struct_ptr, 64);
/* PARAM_PTR already accounts for all the arguments passed
by the user. However, the ABI mandates minimum stack
space allocations for outgoing arguments. The ABI also
mandates minimum stack alignments which we must
preserve. */
param_end = struct_end + align_up (param_ptr, 64);
}
}
/* If a structure has to be returned, set up register 28 to hold its
address */
if (struct_return)
write_register (28, struct_addr);
gp = tdep->find_global_pointer (function);
if (gp != 0)
write_register (19, gp);
/* Set the return address. */
regcache_cooked_write_unsigned (regcache, HPPA_RP_REGNUM, bp_addr);
/* Update the Stack Pointer. */
regcache_cooked_write_unsigned (regcache, HPPA_SP_REGNUM, param_end);
return param_end;
}
/* This function pushes a stack frame with arguments as part of the
inferior function calling mechanism.
This is the version for the PA64, in which later arguments appear
at higher addresses. (The stack always grows towards higher
addresses.)
We simply allocate the appropriate amount of stack space and put
arguments into their proper slots.
This ABI also requires that the caller provide an argument pointer
to the callee, so we do that too. */
static CORE_ADDR
hppa64_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
struct regcache *regcache, CORE_ADDR bp_addr,
int nargs, struct value **args, CORE_ADDR sp,
int struct_return, CORE_ADDR struct_addr)
{
/* NOTE: cagney/2004-02-27: This is a guess - its implemented by
reverse engineering testsuite failures. */
/* Stack base address at which any pass-by-reference parameters are
stored. */
CORE_ADDR struct_end = 0;
/* Stack base address at which the first parameter is stored. */
CORE_ADDR param_end = 0;
/* The inner most end of the stack after all the parameters have
been pushed. */
CORE_ADDR new_sp = 0;
/* Two passes. First pass computes the location of everything,
second pass writes the bytes out. */
int write_pass;
for (write_pass = 0; write_pass < 2; write_pass++)
{
CORE_ADDR struct_ptr = 0;
CORE_ADDR param_ptr = 0;
int i;
for (i = 0; i < nargs; i++)
{
struct value *arg = args[i];
struct type *type = check_typedef (value_type (arg));
if ((TYPE_CODE (type) == TYPE_CODE_INT
|| TYPE_CODE (type) == TYPE_CODE_ENUM)
&& TYPE_LENGTH (type) <= 8)
{
/* Integer value store, right aligned. "unpack_long"
takes care of any sign-extension problems. */
param_ptr += 8;
if (write_pass)
{
ULONGEST val = unpack_long (type, VALUE_CONTENTS (arg));
int reg = 27 - param_ptr / 8;
write_memory_unsigned_integer (param_end - param_ptr,
val, 8);
if (reg >= 19)
regcache_cooked_write_unsigned (regcache, reg, val);
}
}
else
{
/* Small struct value, store left aligned? */
int reg;
if (TYPE_LENGTH (type) > 8)
{
param_ptr = align_up (param_ptr, 16);
reg = 26 - param_ptr / 8;
param_ptr += align_up (TYPE_LENGTH (type), 16);
}
else
{
param_ptr = align_up (param_ptr, 8);
reg = 26 - param_ptr / 8;
param_ptr += align_up (TYPE_LENGTH (type), 8);
}
if (write_pass)
{
int byte;
write_memory (param_end - param_ptr, VALUE_CONTENTS (arg),
TYPE_LENGTH (type));
for (byte = 0; byte < TYPE_LENGTH (type); byte += 8)
{
if (reg >= 19)
{
int len = min (8, TYPE_LENGTH (type) - byte);
regcache_cooked_write_part (regcache, reg, 0, len,
VALUE_CONTENTS (arg) + byte);
}
reg--;
}
}
}
}
/* Update the various stack pointers. */
if (!write_pass)
{
struct_end = sp + struct_ptr;
/* PARAM_PTR already accounts for all the arguments passed
by the user. However, the ABI mandates minimum stack
space allocations for outgoing arguments. The ABI also
mandates minimum stack alignments which we must
preserve. */
param_end = struct_end + max (align_up (param_ptr, 16), 64);
}
}
/* If a structure has to be returned, set up register 28 to hold its
address */
if (struct_return)
write_register (28, struct_addr);
/* Set the return address. */
regcache_cooked_write_unsigned (regcache, HPPA_RP_REGNUM, bp_addr);
/* Update the Stack Pointer. */
regcache_cooked_write_unsigned (regcache, HPPA_SP_REGNUM, param_end + 64);
/* The stack will have 32 bytes of additional space for a frame marker. */
return param_end + 64;
}
static CORE_ADDR
hppa32_convert_from_func_ptr_addr (struct gdbarch *gdbarch,
CORE_ADDR addr,
struct target_ops *targ)
{
if (addr & 2)
{
CORE_ADDR plabel;
plabel = addr & ~3;
target_read_memory(plabel, (char *)&addr, 4);
}
return addr;
}
static CORE_ADDR
hppa32_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
{
/* HP frames are 64-byte (or cache line) aligned (yes that's _byte_
and not _bit_)! */
return align_up (addr, 64);
}
/* Force all frames to 16-byte alignment. Better safe than sorry. */
static CORE_ADDR
hppa64_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
{
/* Just always 16-byte align. */
return align_up (addr, 16);
}
/* Get the PC from %r31 if currently in a syscall. Also mask out privilege
bits. */
static CORE_ADDR
hppa_target_read_pc (ptid_t ptid)
{
int flags = read_register_pid (HPPA_FLAGS_REGNUM, ptid);
/* The following test does not belong here. It is OS-specific, and belongs
in native code. */
/* Test SS_INSYSCALL */
if (flags & 2)
return read_register_pid (31, ptid) & ~0x3;
return read_register_pid (HPPA_PCOQ_HEAD_REGNUM, ptid) & ~0x3;
}
/* Write out the PC. If currently in a syscall, then also write the new
PC value into %r31. */
static void
hppa_target_write_pc (CORE_ADDR v, ptid_t ptid)
{
int flags = read_register_pid (HPPA_FLAGS_REGNUM, ptid);
/* The following test does not belong here. It is OS-specific, and belongs
in native code. */
/* If in a syscall, then set %r31. Also make sure to get the
privilege bits set correctly. */
/* Test SS_INSYSCALL */
if (flags & 2)
write_register_pid (31, v | 0x3, ptid);
write_register_pid (HPPA_PCOQ_HEAD_REGNUM, v, ptid);
write_register_pid (HPPA_PCOQ_TAIL_REGNUM, v + 4, ptid);
}
/* return the alignment of a type in bytes. Structures have the maximum
alignment required by their fields. */
static int
hppa_alignof (struct type *type)
{
int max_align, align, i;
CHECK_TYPEDEF (type);
switch (TYPE_CODE (type))
{
case TYPE_CODE_PTR:
case TYPE_CODE_INT:
case TYPE_CODE_FLT:
return TYPE_LENGTH (type);
case TYPE_CODE_ARRAY:
return hppa_alignof (TYPE_FIELD_TYPE (type, 0));
case TYPE_CODE_STRUCT:
case TYPE_CODE_UNION:
max_align = 1;
for (i = 0; i < TYPE_NFIELDS (type); i++)
{
/* Bit fields have no real alignment. */
/* if (!TYPE_FIELD_BITPOS (type, i)) */
if (!TYPE_FIELD_BITSIZE (type, i)) /* elz: this should be bitsize */
{
align = hppa_alignof (TYPE_FIELD_TYPE (type, i));
max_align = max (max_align, align);
}
}
return max_align;
default:
return 4;
}
}
/* For the given instruction (INST), return any adjustment it makes
to the stack pointer or zero for no adjustment.
This only handles instructions commonly found in prologues. */
static int
prologue_inst_adjust_sp (unsigned long inst)
{
/* This must persist across calls. */
static int save_high21;
/* The most common way to perform a stack adjustment ldo X(sp),sp */
if ((inst & 0xffffc000) == 0x37de0000)
return hppa_extract_14 (inst);
/* stwm X,D(sp) */
if ((inst & 0xffe00000) == 0x6fc00000)
return hppa_extract_14 (inst);
/* std,ma X,D(sp) */
if ((inst & 0xffe00008) == 0x73c00008)
return (inst & 0x1 ? -1 << 13 : 0) | (((inst >> 4) & 0x3ff) << 3);
/* addil high21,%r1; ldo low11,(%r1),%r30)
save high bits in save_high21 for later use. */
if ((inst & 0xffe00000) == 0x28200000)
{
save_high21 = hppa_extract_21 (inst);
return 0;
}
if ((inst & 0xffff0000) == 0x343e0000)
return save_high21 + hppa_extract_14 (inst);
/* fstws as used by the HP compilers. */
if ((inst & 0xffffffe0) == 0x2fd01220)
return hppa_extract_5_load (inst);
/* No adjustment. */
return 0;
}
/* Return nonzero if INST is a branch of some kind, else return zero. */
static int
is_branch (unsigned long inst)
{
switch (inst >> 26)
{
case 0x20:
case 0x21:
case 0x22:
case 0x23:
case 0x27:
case 0x28:
case 0x29:
case 0x2a:
case 0x2b:
case 0x2f:
case 0x30:
case 0x31:
case 0x32:
case 0x33:
case 0x38:
case 0x39:
case 0x3a:
case 0x3b:
return 1;
default:
return 0;
}
}
/* Return the register number for a GR which is saved by INST or
zero it INST does not save a GR. */
static int
inst_saves_gr (unsigned long inst)
{
/* Does it look like a stw? */
if ((inst >> 26) == 0x1a || (inst >> 26) == 0x1b
|| (inst >> 26) == 0x1f
|| ((inst >> 26) == 0x1f
&& ((inst >> 6) == 0xa)))
return hppa_extract_5R_store (inst);
/* Does it look like a std? */
if ((inst >> 26) == 0x1c
|| ((inst >> 26) == 0x03
&& ((inst >> 6) & 0xf) == 0xb))
return hppa_extract_5R_store (inst);
/* Does it look like a stwm? GCC & HPC may use this in prologues. */
if ((inst >> 26) == 0x1b)
return hppa_extract_5R_store (inst);
/* Does it look like sth or stb? HPC versions 9.0 and later use these
too. */
if ((inst >> 26) == 0x19 || (inst >> 26) == 0x18
|| ((inst >> 26) == 0x3
&& (((inst >> 6) & 0xf) == 0x8
|| (inst >> 6) & 0xf) == 0x9))
return hppa_extract_5R_store (inst);
return 0;
}
/* Return the register number for a FR which is saved by INST or
zero it INST does not save a FR.
Note we only care about full 64bit register stores (that's the only
kind of stores the prologue will use).
FIXME: What about argument stores with the HP compiler in ANSI mode? */
static int
inst_saves_fr (unsigned long inst)
{
/* is this an FSTD ? */
if ((inst & 0xfc00dfc0) == 0x2c001200)
return hppa_extract_5r_store (inst);
if ((inst & 0xfc000002) == 0x70000002)
return hppa_extract_5R_store (inst);
/* is this an FSTW ? */
if ((inst & 0xfc00df80) == 0x24001200)
return hppa_extract_5r_store (inst);
if ((inst & 0xfc000002) == 0x7c000000)
return hppa_extract_5R_store (inst);
return 0;
}
/* Advance PC across any function entry prologue instructions
to reach some "real" code.
Use information in the unwind table to determine what exactly should
be in the prologue. */
static CORE_ADDR
skip_prologue_hard_way (CORE_ADDR pc, int stop_before_branch)
{
char buf[4];
CORE_ADDR orig_pc = pc;
unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp;
unsigned long args_stored, status, i, restart_gr, restart_fr;
struct unwind_table_entry *u;
int final_iteration;
restart_gr = 0;
restart_fr = 0;
restart:
u = find_unwind_entry (pc);
if (!u)
return pc;
/* If we are not at the beginning of a function, then return now. */
if ((pc & ~0x3) != u->region_start)
return pc;
/* This is how much of a frame adjustment we need to account for. */
stack_remaining = u->Total_frame_size << 3;
/* Magic register saves we want to know about. */
save_rp = u->Save_RP;
save_sp = u->Save_SP;
/* An indication that args may be stored into the stack. Unfortunately
the HPUX compilers tend to set this in cases where no args were
stored too!. */
args_stored = 1;
/* Turn the Entry_GR field into a bitmask. */
save_gr = 0;
for (i = 3; i < u->Entry_GR + 3; i++)
{
/* Frame pointer gets saved into a special location. */
if (u->Save_SP && i == HPPA_FP_REGNUM)
continue;
save_gr |= (1 << i);
}
save_gr &= ~restart_gr;
/* Turn the Entry_FR field into a bitmask too. */
save_fr = 0;
for (i = 12; i < u->Entry_FR + 12; i++)
save_fr |= (1 << i);
save_fr &= ~restart_fr;
final_iteration = 0;
/* Loop until we find everything of interest or hit a branch.
For unoptimized GCC code and for any HP CC code this will never ever
examine any user instructions.
For optimzied GCC code we're faced with problems. GCC will schedule
its prologue and make prologue instructions available for delay slot
filling. The end result is user code gets mixed in with the prologue
and a prologue instruction may be in the delay slot of the first branch
or call.
Some unexpected things are expected with debugging optimized code, so
we allow this routine to walk past user instructions in optimized
GCC code. */
while (save_gr || save_fr || save_rp || save_sp || stack_remaining > 0
|| args_stored)
{
unsigned int reg_num;
unsigned long old_stack_remaining, old_save_gr, old_save_fr;
unsigned long old_save_rp, old_save_sp, next_inst;
/* Save copies of all the triggers so we can compare them later
(only for HPC). */
old_save_gr = save_gr;
old_save_fr = save_fr;
old_save_rp = save_rp;
old_save_sp = save_sp;
old_stack_remaining = stack_remaining;
status = deprecated_read_memory_nobpt (pc, buf, 4);
inst = extract_unsigned_integer (buf, 4);
/* Yow! */
if (status != 0)
return pc;
/* Note the interesting effects of this instruction. */
stack_remaining -= prologue_inst_adjust_sp (inst);
/* There are limited ways to store the return pointer into the
stack. */
if (inst == 0x6bc23fd9 || inst == 0x0fc212c1)
save_rp = 0;
/* These are the only ways we save SP into the stack. At this time
the HP compilers never bother to save SP into the stack. */
if ((inst & 0xffffc000) == 0x6fc10000
|| (inst & 0xffffc00c) == 0x73c10008)
save_sp = 0;
/* Are we loading some register with an offset from the argument
pointer? */
if ((inst & 0xffe00000) == 0x37a00000
|| (inst & 0xffffffe0) == 0x081d0240)
{
pc += 4;
continue;
}
/* Account for general and floating-point register saves. */
reg_num = inst_saves_gr (inst);
save_gr &= ~(1 << reg_num);
/* Ugh. Also account for argument stores into the stack.
Unfortunately args_stored only tells us that some arguments
where stored into the stack. Not how many or what kind!
This is a kludge as on the HP compiler sets this bit and it
never does prologue scheduling. So once we see one, skip past
all of them. We have similar code for the fp arg stores below.
FIXME. Can still die if we have a mix of GR and FR argument
stores! */
if (reg_num >= (TARGET_PTR_BIT == 64 ? 19 : 23) && reg_num <= 26)
{
while (reg_num >= (TARGET_PTR_BIT == 64 ? 19 : 23) && reg_num <= 26)
{
pc += 4;
status = deprecated_read_memory_nobpt (pc, buf, 4);
inst = extract_unsigned_integer (buf, 4);
if (status != 0)
return pc;
reg_num = inst_saves_gr (inst);
}
args_stored = 0;
continue;
}
reg_num = inst_saves_fr (inst);
save_fr &= ~(1 << reg_num);
status = deprecated_read_memory_nobpt (pc + 4, buf, 4);
next_inst = extract_unsigned_integer (buf, 4);
/* Yow! */
if (status != 0)
return pc;
/* We've got to be read to handle the ldo before the fp register
save. */
if ((inst & 0xfc000000) == 0x34000000
&& inst_saves_fr (next_inst) >= 4
&& inst_saves_fr (next_inst) <= (TARGET_PTR_BIT == 64 ? 11 : 7))
{
/* So we drop into the code below in a reasonable state. */
reg_num = inst_saves_fr (next_inst);
pc -= 4;
}
/* Ugh. Also account for argument stores into the stack.
This is a kludge as on the HP compiler sets this bit and it
never does prologue scheduling. So once we see one, skip past
all of them. */
if (reg_num >= 4 && reg_num <= (TARGET_PTR_BIT == 64 ? 11 : 7))
{
while (reg_num >= 4 && reg_num <= (TARGET_PTR_BIT == 64 ? 11 : 7))
{
pc += 8;
status = deprecated_read_memory_nobpt (pc, buf, 4);
inst = extract_unsigned_integer (buf, 4);
if (status != 0)
return pc;
if ((inst & 0xfc000000) != 0x34000000)
break;
status = deprecated_read_memory_nobpt (pc + 4, buf, 4);
next_inst = extract_unsigned_integer (buf, 4);
if (status != 0)
return pc;
reg_num = inst_saves_fr (next_inst);
}
args_stored = 0;
continue;
}
/* Quit if we hit any kind of branch. This can happen if a prologue
instruction is in the delay slot of the first call/branch. */
if (is_branch (inst) && stop_before_branch)
break;
/* What a crock. The HP compilers set args_stored even if no
arguments were stored into the stack (boo hiss). This could
cause this code to then skip a bunch of user insns (up to the
first branch).
To combat this we try to identify when args_stored was bogusly
set and clear it. We only do this when args_stored is nonzero,
all other resources are accounted for, and nothing changed on
this pass. */
if (args_stored
&& !(save_gr || save_fr || save_rp || save_sp || stack_remaining > 0)
&& old_save_gr == save_gr && old_save_fr == save_fr
&& old_save_rp == save_rp && old_save_sp == save_sp
&& old_stack_remaining == stack_remaining)
break;
/* Bump the PC. */
pc += 4;
/* !stop_before_branch, so also look at the insn in the delay slot
of the branch. */
if (final_iteration)
break;
if (is_branch (inst))
final_iteration = 1;
}
/* We've got a tenative location for the end of the prologue. However
because of limitations in the unwind descriptor mechanism we may
have went too far into user code looking for the save of a register
that does not exist. So, if there registers we expected to be saved
but never were, mask them out and restart.
This should only happen in optimized code, and should be very rare. */
if (save_gr || (save_fr && !(restart_fr || restart_gr)))
{
pc = orig_pc;
restart_gr = save_gr;
restart_fr = save_fr;
goto restart;
}
return pc;
}
/* Return the address of the PC after the last prologue instruction if
we can determine it from the debug symbols. Else return zero. */
static CORE_ADDR
after_prologue (CORE_ADDR pc)
{
struct symtab_and_line sal;
CORE_ADDR func_addr, func_end;
struct symbol *f;
/* If we can not find the symbol in the partial symbol table, then
there is no hope we can determine the function's start address
with this code. */
if (!find_pc_partial_function (pc, NULL, &func_addr, &func_end))
return 0;
/* Get the line associated with FUNC_ADDR. */
sal = find_pc_line (func_addr, 0);
/* There are only two cases to consider. First, the end of the source line
is within the function bounds. In that case we return the end of the
source line. Second is the end of the source line extends beyond the
bounds of the current function. We need to use the slow code to
examine instructions in that case.
Anything else is simply a bug elsewhere. Fixing it here is absolutely
the wrong thing to do. In fact, it should be entirely possible for this
function to always return zero since the slow instruction scanning code
is supposed to *always* work. If it does not, then it is a bug. */
if (sal.end < func_end)
return sal.end;
else
return 0;
}
/* To skip prologues, I use this predicate. Returns either PC itself
if the code at PC does not look like a function prologue; otherwise
returns an address that (if we're lucky) follows the prologue.
hppa_skip_prologue is called by gdb to place a breakpoint in a function.
It doesn't necessarily skips all the insns in the prologue. In fact
we might not want to skip all the insns because a prologue insn may
appear in the delay slot of the first branch, and we don't want to
skip over the branch in that case. */
static CORE_ADDR
hppa_skip_prologue (CORE_ADDR pc)
{
unsigned long inst;
int offset;
CORE_ADDR post_prologue_pc;
char buf[4];
/* See if we can determine the end of the prologue via the symbol table.
If so, then return either PC, or the PC after the prologue, whichever
is greater. */
post_prologue_pc = after_prologue (pc);
/* If after_prologue returned a useful address, then use it. Else
fall back on the instruction skipping code.
Some folks have claimed this causes problems because the breakpoint
may be the first instruction of the prologue. If that happens, then
the instruction skipping code has a bug that needs to be fixed. */
if (post_prologue_pc != 0)
return max (pc, post_prologue_pc);
else
return (skip_prologue_hard_way (pc, 1));
}
struct hppa_frame_cache
{
CORE_ADDR base;
struct trad_frame_saved_reg *saved_regs;
};
static struct hppa_frame_cache *
hppa_frame_cache (struct frame_info *next_frame, void **this_cache)
{
struct hppa_frame_cache *cache;
long saved_gr_mask;
long saved_fr_mask;
CORE_ADDR this_sp;
long frame_size;
struct unwind_table_entry *u;
CORE_ADDR prologue_end;
int fp_in_r1 = 0;
int i;
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "{ hppa_frame_cache (frame=%d) -> ",
frame_relative_level(next_frame));
if ((*this_cache) != NULL)
{
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "base=0x%s (cached) }",
paddr_nz (((struct hppa_frame_cache *)*this_cache)->base));
return (*this_cache);
}
cache = FRAME_OBSTACK_ZALLOC (struct hppa_frame_cache);
(*this_cache) = cache;
cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
/* Yow! */
u = find_unwind_entry (frame_pc_unwind (next_frame));
if (!u)
{
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "base=NULL (no unwind entry) }");
return (*this_cache);
}
/* Turn the Entry_GR field into a bitmask. */
saved_gr_mask = 0;
for (i = 3; i < u->Entry_GR + 3; i++)
{
/* Frame pointer gets saved into a special location. */
if (u->Save_SP && i == HPPA_FP_REGNUM)
continue;
saved_gr_mask |= (1 << i);
}
/* Turn the Entry_FR field into a bitmask too. */
saved_fr_mask = 0;
for (i = 12; i < u->Entry_FR + 12; i++)
saved_fr_mask |= (1 << i);
/* Loop until we find everything of interest or hit a branch.
For unoptimized GCC code and for any HP CC code this will never ever
examine any user instructions.
For optimized GCC code we're faced with problems. GCC will schedule
its prologue and make prologue instructions available for delay slot
filling. The end result is user code gets mixed in with the prologue
and a prologue instruction may be in the delay slot of the first branch
or call.
Some unexpected things are expected with debugging optimized code, so
we allow this routine to walk past user instructions in optimized
GCC code. */
{
int final_iteration = 0;
CORE_ADDR pc, end_pc;
int looking_for_sp = u->Save_SP;
int looking_for_rp = u->Save_RP;
int fp_loc = -1;
/* We have to use skip_prologue_hard_way instead of just
skip_prologue_using_sal, in case we stepped into a function without
symbol information. hppa_skip_prologue also bounds the returned
pc by the passed in pc, so it will not return a pc in the next
function.
We used to call hppa_skip_prologue to find the end of the prologue,
but if some non-prologue instructions get scheduled into the prologue,
and the program is compiled with debug information, the "easy" way
in hppa_skip_prologue will return a prologue end that is too early
for us to notice any potential frame adjustments. */
/* We used to use frame_func_unwind () to locate the beginning of the
function to pass to skip_prologue (). However, when objects are
compiled without debug symbols, frame_func_unwind can return the wrong
function (or 0). We can do better than that by using unwind records. */
prologue_end = skip_prologue_hard_way (u->region_start, 0);
end_pc = frame_pc_unwind (next_frame);
if (prologue_end != 0 && end_pc > prologue_end)
end_pc = prologue_end;
frame_size = 0;
for (pc = u->region_start;
((saved_gr_mask || saved_fr_mask
|| looking_for_sp || looking_for_rp
|| frame_size < (u->Total_frame_size << 3))
&& pc < end_pc);
pc += 4)
{
int reg;
char buf4[4];
long inst;
if (!safe_frame_unwind_memory (next_frame, pc, buf4,
sizeof buf4))
{
error ("Cannot read instruction at 0x%s\n", paddr_nz (pc));
return (*this_cache);
}
inst = extract_unsigned_integer (buf4, sizeof buf4);
/* Note the interesting effects of this instruction. */
frame_size += prologue_inst_adjust_sp (inst);
/* There are limited ways to store the return pointer into the
stack. */
if (inst == 0x6bc23fd9) /* stw rp,-0x14(sr0,sp) */
{
looking_for_rp = 0;
cache->saved_regs[HPPA_RP_REGNUM].addr = -20;
}
else if (inst == 0x6bc23fd1) /* stw rp,-0x18(sr0,sp) */
{
looking_for_rp = 0;
cache->saved_regs[HPPA_RP_REGNUM].addr = -24;
}
else if (inst == 0x0fc212c1) /* std rp,-0x10(sr0,sp) */
{
looking_for_rp = 0;
cache->saved_regs[HPPA_RP_REGNUM].addr = -16;
}
/* Check to see if we saved SP into the stack. This also
happens to indicate the location of the saved frame
pointer. */
if ((inst & 0xffffc000) == 0x6fc10000 /* stw,ma r1,N(sr0,sp) */
|| (inst & 0xffffc00c) == 0x73c10008) /* std,ma r1,N(sr0,sp) */
{
looking_for_sp = 0;
cache->saved_regs[HPPA_FP_REGNUM].addr = 0;
}
else if (inst == 0x08030241) /* copy %r3, %r1 */
{
fp_in_r1 = 1;
}
/* Account for general and floating-point register saves. */
reg = inst_saves_gr (inst);
if (reg >= 3 && reg <= 18
&& (!u->Save_SP || reg != HPPA_FP_REGNUM))
{
saved_gr_mask &= ~(1 << reg);
if ((inst >> 26) == 0x1b && hppa_extract_14 (inst) >= 0)
/* stwm with a positive displacement is a _post_
_modify_. */
cache->saved_regs[reg].addr = 0;
else if ((inst & 0xfc00000c) == 0x70000008)
/* A std has explicit post_modify forms. */
cache->saved_regs[reg].addr = 0;
else
{
CORE_ADDR offset;
if ((inst >> 26) == 0x1c)
offset = (inst & 0x1 ? -1 << 13 : 0) | (((inst >> 4) & 0x3ff) << 3);
else if ((inst >> 26) == 0x03)
offset = hppa_low_hppa_sign_extend (inst & 0x1f, 5);
else
offset = hppa_extract_14 (inst);
/* Handle code with and without frame pointers. */
if (u->Save_SP)
cache->saved_regs[reg].addr = offset;
else
cache->saved_regs[reg].addr = (u->Total_frame_size << 3) + offset;
}
}
/* GCC handles callee saved FP regs a little differently.
It emits an instruction to put the value of the start of
the FP store area into %r1. It then uses fstds,ma with a
basereg of %r1 for the stores.
HP CC emits them at the current stack pointer modifying the
stack pointer as it stores each register. */
/* ldo X(%r3),%r1 or ldo X(%r30),%r1. */
if ((inst & 0xffffc000) == 0x34610000
|| (inst & 0xffffc000) == 0x37c10000)
fp_loc = hppa_extract_14 (inst);
reg = inst_saves_fr (inst);
if (reg >= 12 && reg <= 21)
{
/* Note +4 braindamage below is necessary because the FP
status registers are internally 8 registers rather than
the expected 4 registers. */
saved_fr_mask &= ~(1 << reg);
if (fp_loc == -1)
{
/* 1st HP CC FP register store. After this
instruction we've set enough state that the GCC and
HPCC code are both handled in the same manner. */
cache->saved_regs[reg + HPPA_FP4_REGNUM + 4].addr = 0;
fp_loc = 8;
}
else
{
cache->saved_regs[reg + HPPA_FP0_REGNUM + 4].addr = fp_loc;
fp_loc += 8;
}
}
/* Quit if we hit any kind of branch the previous iteration. */
if (final_iteration)
break;
/* We want to look precisely one instruction beyond the branch
if we have not found everything yet. */
if (is_branch (inst))
final_iteration = 1;
}
}
{
/* The frame base always represents the value of %sp at entry to
the current function (and is thus equivalent to the "saved"
stack pointer. */
CORE_ADDR this_sp = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM);
CORE_ADDR fp;
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, " (this_sp=0x%s, pc=0x%s, "
"prologue_end=0x%s) ",
paddr_nz (this_sp),
paddr_nz (frame_pc_unwind (next_frame)),
paddr_nz (prologue_end));
/* Check to see if a frame pointer is available, and use it for
frame unwinding if it is.
There are some situations where we need to rely on the frame
pointer to do stack unwinding. For example, if a function calls
alloca (), the stack pointer can get adjusted inside the body of
the function. In this case, the ABI requires that the compiler
maintain a frame pointer for the function.
The unwind record has a flag (alloca_frame) that indicates that
a function has a variable frame; unfortunately, gcc/binutils
does not set this flag. Instead, whenever a frame pointer is used
and saved on the stack, the Save_SP flag is set. We use this to
decide whether to use the frame pointer for unwinding.
TODO: For the HP compiler, maybe we should use the alloca_frame flag
instead of Save_SP. */
fp = frame_unwind_register_unsigned (next_frame, HPPA_FP_REGNUM);
if (frame_pc_unwind (next_frame) >= prologue_end
&& u->Save_SP && fp != 0)
{
cache->base = fp;
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, " (base=0x%s) [frame pointer] }",
paddr_nz (cache->base));
}
else if (u->Save_SP
&& trad_frame_addr_p (cache->saved_regs, HPPA_SP_REGNUM))
{
/* Both we're expecting the SP to be saved and the SP has been
saved. The entry SP value is saved at this frame's SP
address. */
cache->base = read_memory_integer (this_sp, TARGET_PTR_BIT / 8);
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, " (base=0x%s) [saved] }",
paddr_nz (cache->base));
}
else
{
/* The prologue has been slowly allocating stack space. Adjust
the SP back. */
cache->base = this_sp - frame_size;
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, " (base=0x%s) [unwind adjust] } ",
paddr_nz (cache->base));
}
trad_frame_set_value (cache->saved_regs, HPPA_SP_REGNUM, cache->base);
}
/* The PC is found in the "return register", "Millicode" uses "r31"
as the return register while normal code uses "rp". */
if (u->Millicode)
{
if (trad_frame_addr_p (cache->saved_regs, 31))
cache->saved_regs[HPPA_PCOQ_HEAD_REGNUM] = cache->saved_regs[31];
else
{
ULONGEST r31 = frame_unwind_register_unsigned (next_frame, 31);
trad_frame_set_value (cache->saved_regs, HPPA_PCOQ_HEAD_REGNUM, r31);
}
}
else
{
if (trad_frame_addr_p (cache->saved_regs, HPPA_RP_REGNUM))
cache->saved_regs[HPPA_PCOQ_HEAD_REGNUM] = cache->saved_regs[HPPA_RP_REGNUM];
else
{
ULONGEST rp = frame_unwind_register_unsigned (next_frame, HPPA_RP_REGNUM);
trad_frame_set_value (cache->saved_regs, HPPA_PCOQ_HEAD_REGNUM, rp);
}
}
/* If Save_SP is set, then we expect the frame pointer to be saved in the
frame. However, there is a one-insn window where we haven't saved it
yet, but we've already clobbered it. Detect this case and fix it up.
The prologue sequence for frame-pointer functions is:
0: stw %rp, -20(%sp)
4: copy %r3, %r1
8: copy %sp, %r3
c: stw,ma %r1, XX(%sp)
So if we are at offset c, the r3 value that we want is not yet saved
on the stack, but it's been overwritten. The prologue analyzer will
set fp_in_r1 when it sees the copy insn so we know to get the value
from r1 instead. */
if (u->Save_SP && !trad_frame_addr_p (cache->saved_regs, HPPA_FP_REGNUM)
&& fp_in_r1)
{
ULONGEST r1 = frame_unwind_register_unsigned (next_frame, 1);
trad_frame_set_value (cache->saved_regs, HPPA_FP_REGNUM, r1);
}
{
/* Convert all the offsets into addresses. */
int reg;
for (reg = 0; reg < NUM_REGS; reg++)
{
if (trad_frame_addr_p (cache->saved_regs, reg))
cache->saved_regs[reg].addr += cache->base;
}
}
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "base=0x%s }",
paddr_nz (((struct hppa_frame_cache *)*this_cache)->base));
return (*this_cache);
}
static void
hppa_frame_this_id (struct frame_info *next_frame, void **this_cache,
struct frame_id *this_id)
{
struct hppa_frame_cache *info;
CORE_ADDR pc = frame_pc_unwind (next_frame);
struct unwind_table_entry *u;
info = hppa_frame_cache (next_frame, this_cache);
u = find_unwind_entry (pc);
(*this_id) = frame_id_build (info->base, u->region_start);
}
static void
hppa_frame_prev_register (struct frame_info *next_frame,
void **this_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
int *realnump, void *valuep)
{
struct hppa_frame_cache *info = hppa_frame_cache (next_frame, this_cache);
hppa_frame_prev_register_helper (next_frame, info->saved_regs, regnum,
optimizedp, lvalp, addrp, realnump, valuep);
}
static const struct frame_unwind hppa_frame_unwind =
{
NORMAL_FRAME,
hppa_frame_this_id,
hppa_frame_prev_register
};
static const struct frame_unwind *
hppa_frame_unwind_sniffer (struct frame_info *next_frame)
{
CORE_ADDR pc = frame_pc_unwind (next_frame);
if (find_unwind_entry (pc))
return &hppa_frame_unwind;
return NULL;
}
/* This is a generic fallback frame unwinder that kicks in if we fail all
the other ones. Normally we would expect the stub and regular unwinder
to work, but in some cases we might hit a function that just doesn't
have any unwind information available. In this case we try to do
unwinding solely based on code reading. This is obviously going to be
slow, so only use this as a last resort. Currently this will only
identify the stack and pc for the frame. */
static struct hppa_frame_cache *
hppa_fallback_frame_cache (struct frame_info *next_frame, void **this_cache)
{
struct hppa_frame_cache *cache;
unsigned int frame_size;
int found_rp;
CORE_ADDR pc, start_pc, end_pc, cur_pc;
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "{ hppa_fallback_frame_cache (frame=%d)-> ",
frame_relative_level(next_frame));
cache = FRAME_OBSTACK_ZALLOC (struct hppa_frame_cache);
(*this_cache) = cache;
cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
pc = frame_func_unwind (next_frame);
cur_pc = frame_pc_unwind (next_frame);
frame_size = 0;
found_rp = 0;
find_pc_partial_function (pc, NULL, &start_pc, &end_pc);
if (start_pc == 0 || end_pc == 0)
{
error ("Cannot find bounds of current function (@0x%s), unwinding will "
"fail.", paddr_nz (pc));
return cache;
}
if (end_pc > cur_pc)
end_pc = cur_pc;
for (pc = start_pc; pc < end_pc; pc += 4)
{
unsigned int insn;
insn = read_memory_unsigned_integer (pc, 4);
frame_size += prologue_inst_adjust_sp (insn);
/* There are limited ways to store the return pointer into the
stack. */
if (insn == 0x6bc23fd9) /* stw rp,-0x14(sr0,sp) */
{
cache->saved_regs[HPPA_RP_REGNUM].addr = -20;
found_rp = 1;
}
else if (insn == 0x0fc212c1) /* std rp,-0x10(sr0,sp) */
{
cache->saved_regs[HPPA_RP_REGNUM].addr = -16;
found_rp = 1;
}
}
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, " frame_size = %d, found_rp = %d }\n",
frame_size, found_rp);
cache->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM) - frame_size;
trad_frame_set_value (cache->saved_regs, HPPA_SP_REGNUM, cache->base);
if (trad_frame_addr_p (cache->saved_regs, HPPA_RP_REGNUM))
{
cache->saved_regs[HPPA_RP_REGNUM].addr += cache->base;
cache->saved_regs[HPPA_PCOQ_HEAD_REGNUM] = cache->saved_regs[HPPA_RP_REGNUM];
}
else
{
ULONGEST rp = frame_unwind_register_unsigned (next_frame, HPPA_RP_REGNUM);
trad_frame_set_value (cache->saved_regs, HPPA_PCOQ_HEAD_REGNUM, rp);
}
return cache;
}
static void
hppa_fallback_frame_this_id (struct frame_info *next_frame, void **this_cache,
struct frame_id *this_id)
{
struct hppa_frame_cache *info =
hppa_fallback_frame_cache (next_frame, this_cache);
(*this_id) = frame_id_build (info->base, frame_func_unwind (next_frame));
}
static void
hppa_fallback_frame_prev_register (struct frame_info *next_frame,
void **this_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
int *realnump, void *valuep)
{
struct hppa_frame_cache *info =
hppa_fallback_frame_cache (next_frame, this_cache);
hppa_frame_prev_register_helper (next_frame, info->saved_regs, regnum,
optimizedp, lvalp, addrp, realnump, valuep);
}
static const struct frame_unwind hppa_fallback_frame_unwind =
{
NORMAL_FRAME,
hppa_fallback_frame_this_id,
hppa_fallback_frame_prev_register
};
static const struct frame_unwind *
hppa_fallback_unwind_sniffer (struct frame_info *next_frame)
{
return &hppa_fallback_frame_unwind;
}
/* Stub frames, used for all kinds of call stubs. */
struct hppa_stub_unwind_cache
{
CORE_ADDR base;
struct trad_frame_saved_reg *saved_regs;
};
static struct hppa_stub_unwind_cache *
hppa_stub_frame_unwind_cache (struct frame_info *next_frame,
void **this_cache)
{
struct gdbarch *gdbarch = get_frame_arch (next_frame);
struct hppa_stub_unwind_cache *info;
struct unwind_table_entry *u;
if (*this_cache)
return *this_cache;
info = FRAME_OBSTACK_ZALLOC (struct hppa_stub_unwind_cache);
*this_cache = info;
info->saved_regs = trad_frame_alloc_saved_regs (next_frame);
info->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM);
if (gdbarch_osabi (gdbarch) == GDB_OSABI_HPUX_SOM)
{
/* HPUX uses export stubs in function calls; the export stub clobbers
the return value of the caller, and, later restores it from the
stack. */
u = find_unwind_entry (frame_pc_unwind (next_frame));
if (u && u->stub_unwind.stub_type == EXPORT)
{
info->saved_regs[HPPA_PCOQ_HEAD_REGNUM].addr = info->base - 24;
return info;
}
}
/* By default we assume that stubs do not change the rp. */
info->saved_regs[HPPA_PCOQ_HEAD_REGNUM].realreg = HPPA_RP_REGNUM;
return info;
}
static void
hppa_stub_frame_this_id (struct frame_info *next_frame,
void **this_prologue_cache,
struct frame_id *this_id)
{
struct hppa_stub_unwind_cache *info
= hppa_stub_frame_unwind_cache (next_frame, this_prologue_cache);
*this_id = frame_id_build (info->base, frame_pc_unwind (next_frame));
}
static void
hppa_stub_frame_prev_register (struct frame_info *next_frame,
void **this_prologue_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
int *realnump, void *valuep)
{
struct hppa_stub_unwind_cache *info
= hppa_stub_frame_unwind_cache (next_frame, this_prologue_cache);
hppa_frame_prev_register_helper (next_frame, info->saved_regs, regnum,
optimizedp, lvalp, addrp, realnump, valuep);
}
static const struct frame_unwind hppa_stub_frame_unwind = {
NORMAL_FRAME,
hppa_stub_frame_this_id,
hppa_stub_frame_prev_register
};
static const struct frame_unwind *
hppa_stub_unwind_sniffer (struct frame_info *next_frame)
{
CORE_ADDR pc = frame_pc_unwind (next_frame);
struct gdbarch *gdbarch = get_frame_arch (next_frame);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
if (pc == 0
|| (tdep->in_solib_call_trampoline != NULL
&& tdep->in_solib_call_trampoline (pc, NULL))
|| IN_SOLIB_RETURN_TRAMPOLINE (pc, NULL))
return &hppa_stub_frame_unwind;
return NULL;
}
static struct frame_id
hppa_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
return frame_id_build (frame_unwind_register_unsigned (next_frame,
HPPA_SP_REGNUM),
frame_pc_unwind (next_frame));
}
static CORE_ADDR
hppa_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
return frame_unwind_register_signed (next_frame, HPPA_PCOQ_HEAD_REGNUM) & ~3;
}
/* Instead of this nasty cast, add a method pvoid() that prints out a
host VOID data type (remember %p isn't portable). */
static CORE_ADDR
hppa_pointer_to_address_hack (void *ptr)
{
gdb_assert (sizeof (ptr) == TYPE_LENGTH (builtin_type_void_data_ptr));
return POINTER_TO_ADDRESS (builtin_type_void_data_ptr, &ptr);
}
static void
unwind_command (char *exp, int from_tty)
{
CORE_ADDR address;
struct unwind_table_entry *u;
/* If we have an expression, evaluate it and use it as the address. */
if (exp != 0 && *exp != 0)
address = parse_and_eval_address (exp);
else
return;
u = find_unwind_entry (address);
if (!u)
{
printf_unfiltered ("Can't find unwind table entry for %s\n", exp);
return;
}
printf_unfiltered ("unwind_table_entry (0x%s):\n",
paddr_nz (hppa_pointer_to_address_hack (u)));
printf_unfiltered ("\tregion_start = ");
print_address (u->region_start, gdb_stdout);
gdb_flush (gdb_stdout);
printf_unfiltered ("\n\tregion_end = ");
print_address (u->region_end, gdb_stdout);
gdb_flush (gdb_stdout);
#define pif(FLD) if (u->FLD) printf_unfiltered (" "#FLD);
printf_unfiltered ("\n\tflags =");
pif (Cannot_unwind);
pif (Millicode);
pif (Millicode_save_sr0);
pif (Entry_SR);
pif (Args_stored);
pif (Variable_Frame);
pif (Separate_Package_Body);
pif (Frame_Extension_Millicode);
pif (Stack_Overflow_Check);
pif (Two_Instruction_SP_Increment);
pif (Ada_Region);
pif (Save_SP);
pif (Save_RP);
pif (Save_MRP_in_frame);
pif (extn_ptr_defined);
pif (Cleanup_defined);
pif (MPE_XL_interrupt_marker);
pif (HP_UX_interrupt_marker);
pif (Large_frame);
putchar_unfiltered ('\n');
#define pin(FLD) printf_unfiltered ("\t"#FLD" = 0x%x\n", u->FLD);
pin (Region_description);
pin (Entry_FR);
pin (Entry_GR);
pin (Total_frame_size);
}
int
hppa_pc_requires_run_before_use (CORE_ADDR pc)
{
/* Sometimes we may pluck out a minimal symbol that has a negative address.
An example of this occurs when an a.out is linked against a foo.sl.
The foo.sl defines a global bar(), and the a.out declares a signature
for bar(). However, the a.out doesn't directly call bar(), but passes
its address in another call.
If you have this scenario and attempt to "break bar" before running,
gdb will find a minimal symbol for bar() in the a.out. But that
symbol's address will be negative. What this appears to denote is
an index backwards from the base of the procedure linkage table (PLT)
into the data linkage table (DLT), the end of which is contiguous
with the start of the PLT. This is clearly not a valid address for
us to set a breakpoint on.
Note that one must be careful in how one checks for a negative address.
0xc0000000 is a legitimate address of something in a shared text
segment, for example. Since I don't know what the possible range
is of these "really, truly negative" addresses that come from the
minimal symbols, I'm resorting to the gross hack of checking the
top byte of the address for all 1's. Sigh. */
return (!target_has_stack && (pc & 0xFF000000));
}
static int
hppa_instruction_nullified (struct gdbarch *gdbarch, struct regcache *regcache)
{
ULONGEST tmp, ipsw, flags;
regcache_cooked_read (regcache, HPPA_IPSW_REGNUM, &tmp);
ipsw = extract_unsigned_integer (&tmp,
register_size (gdbarch, HPPA_IPSW_REGNUM));
regcache_cooked_read (regcache, HPPA_FLAGS_REGNUM, &tmp);
flags = extract_unsigned_integer (&tmp,
register_size (gdbarch, HPPA_FLAGS_REGNUM));
return ((ipsw & 0x00200000) && !(flags & 0x2));
}
/* Return the GDB type object for the "standard" data type of data
in register N. */
static struct type *
hppa32_register_type (struct gdbarch *gdbarch, int reg_nr)
{
if (reg_nr < HPPA_FP4_REGNUM)
return builtin_type_uint32;
else
return builtin_type_ieee_single_big;
}
/* Return the GDB type object for the "standard" data type of data
in register N. hppa64 version. */
static struct type *
hppa64_register_type (struct gdbarch *gdbarch, int reg_nr)
{
if (reg_nr < HPPA_FP4_REGNUM)
return builtin_type_uint64;
else
return builtin_type_ieee_double_big;
}
/* Return True if REGNUM is not a register available to the user
through ptrace(). */
static int
hppa_cannot_store_register (int regnum)
{
return (regnum == 0
|| regnum == HPPA_PCSQ_HEAD_REGNUM
|| (regnum >= HPPA_PCSQ_TAIL_REGNUM && regnum < HPPA_IPSW_REGNUM)
|| (regnum > HPPA_IPSW_REGNUM && regnum < HPPA_FP4_REGNUM));
}
static CORE_ADDR
hppa_smash_text_address (CORE_ADDR addr)
{
/* The low two bits of the PC on the PA contain the privilege level.
Some genius implementing a (non-GCC) compiler apparently decided
this means that "addresses" in a text section therefore include a
privilege level, and thus symbol tables should contain these bits.
This seems like a bonehead thing to do--anyway, it seems to work
for our purposes to just ignore those bits. */
return (addr &= ~0x3);
}
/* Get the ith function argument for the current function. */
static CORE_ADDR
hppa_fetch_pointer_argument (struct frame_info *frame, int argi,
struct type *type)
{
CORE_ADDR addr;
get_frame_register (frame, HPPA_R0_REGNUM + 26 - argi, &addr);
return addr;
}
static void
hppa_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
int regnum, void *buf)
{
ULONGEST tmp;
regcache_raw_read_unsigned (regcache, regnum, &tmp);
if (regnum == HPPA_PCOQ_HEAD_REGNUM || regnum == HPPA_PCOQ_TAIL_REGNUM)
tmp &= ~0x3;
store_unsigned_integer (buf, sizeof(tmp), tmp);
}
static CORE_ADDR
hppa_find_global_pointer (struct value *function)
{
return 0;
}
void
hppa_frame_prev_register_helper (struct frame_info *next_frame,
struct trad_frame_saved_reg saved_regs[],
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
int *realnump, void *valuep)
{
if (regnum == HPPA_PCOQ_TAIL_REGNUM)
{
if (valuep)
{
CORE_ADDR pc;
trad_frame_get_prev_register (next_frame, saved_regs,
HPPA_PCOQ_HEAD_REGNUM, optimizedp,
lvalp, addrp, realnump, valuep);
pc = extract_unsigned_integer (valuep, 4);
store_unsigned_integer (valuep, 4, pc + 4);
}
/* It's a computed value. */
*optimizedp = 0;
*lvalp = not_lval;
*addrp = 0;
*realnump = -1;
return;
}
trad_frame_get_prev_register (next_frame, saved_regs, regnum,
optimizedp, lvalp, addrp, realnump, valuep);
}
/* Here is a table of C type sizes on hppa with various compiles
and options. I measured this on PA 9000/800 with HP-UX 11.11
and these compilers:
/usr/ccs/bin/cc HP92453-01 A.11.01.21
/opt/ansic/bin/cc HP92453-01 B.11.11.28706.GP
/opt/aCC/bin/aCC B3910B A.03.45
gcc gcc 3.3.2 native hppa2.0w-hp-hpux11.11
cc : 1 2 4 4 8 : 4 8 -- : 4 4
ansic +DA1.1 : 1 2 4 4 8 : 4 8 16 : 4 4
ansic +DA2.0 : 1 2 4 4 8 : 4 8 16 : 4 4
ansic +DA2.0W : 1 2 4 8 8 : 4 8 16 : 8 8
acc +DA1.1 : 1 2 4 4 8 : 4 8 16 : 4 4
acc +DA2.0 : 1 2 4 4 8 : 4 8 16 : 4 4
acc +DA2.0W : 1 2 4 8 8 : 4 8 16 : 8 8
gcc : 1 2 4 4 8 : 4 8 16 : 4 4
Each line is:
compiler and options
char, short, int, long, long long
float, double, long double
char *, void (*)()
So all these compilers use either ILP32 or LP64 model.
TODO: gcc has more options so it needs more investigation.
For floating point types, see:
http://docs.hp.com/hpux/pdf/B3906-90006.pdf
HP-UX floating-point guide, hpux 11.00
-- chastain 2003-12-18 */
static struct gdbarch *
hppa_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
struct gdbarch_tdep *tdep;
struct gdbarch *gdbarch;
/* Try to determine the ABI of the object we are loading. */
if (info.abfd != NULL && info.osabi == GDB_OSABI_UNKNOWN)
{
/* If it's a SOM file, assume it's HP/UX SOM. */
if (bfd_get_flavour (info.abfd) == bfd_target_som_flavour)
info.osabi = GDB_OSABI_HPUX_SOM;
}
/* find a candidate among the list of pre-declared architectures. */
arches = gdbarch_list_lookup_by_info (arches, &info);
if (arches != NULL)
return (arches->gdbarch);
/* If none found, then allocate and initialize one. */
tdep = XZALLOC (struct gdbarch_tdep);
gdbarch = gdbarch_alloc (&info, tdep);
/* Determine from the bfd_arch_info structure if we are dealing with
a 32 or 64 bits architecture. If the bfd_arch_info is not available,
then default to a 32bit machine. */
if (info.bfd_arch_info != NULL)
tdep->bytes_per_address =
info.bfd_arch_info->bits_per_address / info.bfd_arch_info->bits_per_byte;
else
tdep->bytes_per_address = 4;
tdep->find_global_pointer = hppa_find_global_pointer;
/* Some parts of the gdbarch vector depend on whether we are running
on a 32 bits or 64 bits target. */
switch (tdep->bytes_per_address)
{
case 4:
set_gdbarch_num_regs (gdbarch, hppa32_num_regs);
set_gdbarch_register_name (gdbarch, hppa32_register_name);
set_gdbarch_register_type (gdbarch, hppa32_register_type);
break;
case 8:
set_gdbarch_num_regs (gdbarch, hppa64_num_regs);
set_gdbarch_register_name (gdbarch, hppa64_register_name);
set_gdbarch_register_type (gdbarch, hppa64_register_type);
break;
default:
internal_error (__FILE__, __LINE__, "Unsupported address size: %d",
tdep->bytes_per_address);
}
set_gdbarch_long_bit (gdbarch, tdep->bytes_per_address * TARGET_CHAR_BIT);
set_gdbarch_ptr_bit (gdbarch, tdep->bytes_per_address * TARGET_CHAR_BIT);
/* The following gdbarch vector elements are the same in both ILP32
and LP64, but might show differences some day. */
set_gdbarch_long_long_bit (gdbarch, 64);
set_gdbarch_long_double_bit (gdbarch, 128);
set_gdbarch_long_double_format (gdbarch, &floatformat_ia64_quad_big);
/* The following gdbarch vector elements do not depend on the address
size, or in any other gdbarch element previously set. */
set_gdbarch_skip_prologue (gdbarch, hppa_skip_prologue);
set_gdbarch_inner_than (gdbarch, core_addr_greaterthan);
set_gdbarch_sp_regnum (gdbarch, HPPA_SP_REGNUM);
set_gdbarch_fp0_regnum (gdbarch, HPPA_FP0_REGNUM);
set_gdbarch_cannot_store_register (gdbarch, hppa_cannot_store_register);
set_gdbarch_cannot_fetch_register (gdbarch, hppa_cannot_store_register);
set_gdbarch_addr_bits_remove (gdbarch, hppa_smash_text_address);
set_gdbarch_smash_text_address (gdbarch, hppa_smash_text_address);
set_gdbarch_believe_pcc_promotion (gdbarch, 1);
set_gdbarch_read_pc (gdbarch, hppa_target_read_pc);
set_gdbarch_write_pc (gdbarch, hppa_target_write_pc);
/* Helper for function argument information. */
set_gdbarch_fetch_pointer_argument (gdbarch, hppa_fetch_pointer_argument);
set_gdbarch_print_insn (gdbarch, print_insn_hppa);
/* When a hardware watchpoint triggers, we'll move the inferior past
it by removing all eventpoints; stepping past the instruction
that caused the trigger; reinserting eventpoints; and checking
whether any watched location changed. */
set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1);
/* Inferior function call methods. */
switch (tdep->bytes_per_address)
{
case 4:
set_gdbarch_push_dummy_call (gdbarch, hppa32_push_dummy_call);
set_gdbarch_frame_align (gdbarch, hppa32_frame_align);
set_gdbarch_convert_from_func_ptr_addr
(gdbarch, hppa32_convert_from_func_ptr_addr);
break;
case 8:
set_gdbarch_push_dummy_call (gdbarch, hppa64_push_dummy_call);
set_gdbarch_frame_align (gdbarch, hppa64_frame_align);
break;
default:
internal_error (__FILE__, __LINE__, "bad switch");
}
/* Struct return methods. */
switch (tdep->bytes_per_address)
{
case 4:
set_gdbarch_return_value (gdbarch, hppa32_return_value);
break;
case 8:
set_gdbarch_return_value (gdbarch, hppa64_return_value);
break;
default:
internal_error (__FILE__, __LINE__, "bad switch");
}
set_gdbarch_breakpoint_from_pc (gdbarch, hppa_breakpoint_from_pc);
set_gdbarch_pseudo_register_read (gdbarch, hppa_pseudo_register_read);
set_gdbarch_instruction_nullified (gdbarch, hppa_instruction_nullified);
/* Frame unwind methods. */
set_gdbarch_unwind_dummy_id (gdbarch, hppa_unwind_dummy_id);
set_gdbarch_unwind_pc (gdbarch, hppa_unwind_pc);
/* Hook in ABI-specific overrides, if they have been registered. */
gdbarch_init_osabi (info, gdbarch);
/* Hook in the default unwinders. */
frame_unwind_append_sniffer (gdbarch, hppa_stub_unwind_sniffer);
frame_unwind_append_sniffer (gdbarch, hppa_frame_unwind_sniffer);
frame_unwind_append_sniffer (gdbarch, hppa_fallback_unwind_sniffer);
return gdbarch;
}
static void
hppa_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
fprintf_unfiltered (file, "bytes_per_address = %d\n",
tdep->bytes_per_address);
fprintf_unfiltered (file, "elf = %s\n", tdep->is_elf ? "yes" : "no");
}
void
_initialize_hppa_tdep (void)
{
struct cmd_list_element *c;
gdbarch_register (bfd_arch_hppa, hppa_gdbarch_init, hppa_dump_tdep);
hppa_objfile_priv_data = register_objfile_data ();
add_cmd ("unwind", class_maintenance, unwind_command,
"Print unwind table entry at given address.",
&maintenanceprintlist);
/* Debug this files internals. */
add_setshow_boolean_cmd ("hppa", class_maintenance, &hppa_debug, "\
Set whether hppa target specific debugging information should be displayed.", "\
Show whether hppa target specific debugging information is displayed.", "\
This flag controls whether hppa target specific debugging information is\n\
displayed. This information is particularly useful for debugging frame\n\
unwinding problems.", "hppa debug flag is %s.",
NULL, NULL, &setdebuglist, &showdebuglist);
}
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