mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-28 04:25:10 +08:00
493 lines
14 KiB
C
493 lines
14 KiB
C
/* Target-dependent code for GNU/Linux running on the Fujitsu FR-V,
|
||
for GDB.
|
||
|
||
Copyright (C) 2004-2020 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 3 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, see <http://www.gnu.org/licenses/>. */
|
||
|
||
#include "defs.h"
|
||
#include "gdbcore.h"
|
||
#include "target.h"
|
||
#include "frame.h"
|
||
#include "osabi.h"
|
||
#include "regcache.h"
|
||
#include "elf-bfd.h"
|
||
#include "elf/frv.h"
|
||
#include "frv-tdep.h"
|
||
#include "trad-frame.h"
|
||
#include "frame-unwind.h"
|
||
#include "regset.h"
|
||
#include "linux-tdep.h"
|
||
#include "gdbarch.h"
|
||
|
||
/* Define the size (in bytes) of an FR-V instruction. */
|
||
static const int frv_instr_size = 4;
|
||
|
||
enum {
|
||
NORMAL_SIGTRAMP = 1,
|
||
RT_SIGTRAMP = 2
|
||
};
|
||
|
||
static int
|
||
frv_linux_pc_in_sigtramp (struct gdbarch *gdbarch, CORE_ADDR pc,
|
||
const char *name)
|
||
{
|
||
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
||
gdb_byte buf[frv_instr_size];
|
||
LONGEST instr;
|
||
int retval = 0;
|
||
|
||
if (target_read_memory (pc, buf, sizeof buf) != 0)
|
||
return 0;
|
||
|
||
instr = extract_unsigned_integer (buf, sizeof buf, byte_order);
|
||
|
||
if (instr == 0x8efc0077) /* setlos #__NR_sigreturn, gr7 */
|
||
retval = NORMAL_SIGTRAMP;
|
||
else if (instr == 0x8efc00ad) /* setlos #__NR_rt_sigreturn, gr7 */
|
||
retval = RT_SIGTRAMP;
|
||
else
|
||
return 0;
|
||
|
||
if (target_read_memory (pc + frv_instr_size, buf, sizeof buf) != 0)
|
||
return 0;
|
||
instr = extract_unsigned_integer (buf, sizeof buf, byte_order);
|
||
if (instr != 0xc0700000) /* tira gr0, 0 */
|
||
return 0;
|
||
|
||
/* If we get this far, we'll return a non-zero value, either
|
||
NORMAL_SIGTRAMP (1) or RT_SIGTRAMP (2). */
|
||
return retval;
|
||
}
|
||
|
||
/* Given NEXT_FRAME, the "callee" frame of the sigtramp frame that we
|
||
wish to decode, and REGNO, one of the frv register numbers defined
|
||
in frv-tdep.h, return the address of the saved register (corresponding
|
||
to REGNO) in the sigtramp frame. Return -1 if the register is not
|
||
found in the sigtramp frame. The magic numbers in the code below
|
||
were computed by examining the following kernel structs:
|
||
|
||
From arch/frv/kernel/signal.c:
|
||
|
||
struct sigframe
|
||
{
|
||
void (*pretcode)(void);
|
||
int sig;
|
||
struct sigcontext sc;
|
||
unsigned long extramask[_NSIG_WORDS-1];
|
||
uint32_t retcode[2];
|
||
};
|
||
|
||
struct rt_sigframe
|
||
{
|
||
void (*pretcode)(void);
|
||
int sig;
|
||
struct siginfo *pinfo;
|
||
void *puc;
|
||
struct siginfo info;
|
||
struct ucontext uc;
|
||
uint32_t retcode[2];
|
||
};
|
||
|
||
From include/asm-frv/ucontext.h:
|
||
|
||
struct ucontext {
|
||
unsigned long uc_flags;
|
||
struct ucontext *uc_link;
|
||
stack_t uc_stack;
|
||
struct sigcontext uc_mcontext;
|
||
sigset_t uc_sigmask;
|
||
};
|
||
|
||
From include/asm-frv/signal.h:
|
||
|
||
typedef struct sigaltstack {
|
||
void *ss_sp;
|
||
int ss_flags;
|
||
size_t ss_size;
|
||
} stack_t;
|
||
|
||
From include/asm-frv/sigcontext.h:
|
||
|
||
struct sigcontext {
|
||
struct user_context sc_context;
|
||
unsigned long sc_oldmask;
|
||
} __attribute__((aligned(8)));
|
||
|
||
From include/asm-frv/registers.h:
|
||
struct user_int_regs
|
||
{
|
||
unsigned long psr;
|
||
unsigned long isr;
|
||
unsigned long ccr;
|
||
unsigned long cccr;
|
||
unsigned long lr;
|
||
unsigned long lcr;
|
||
unsigned long pc;
|
||
unsigned long __status;
|
||
unsigned long syscallno;
|
||
unsigned long orig_gr8;
|
||
unsigned long gner[2];
|
||
unsigned long long iacc[1];
|
||
|
||
union {
|
||
unsigned long tbr;
|
||
unsigned long gr[64];
|
||
};
|
||
};
|
||
|
||
struct user_fpmedia_regs
|
||
{
|
||
unsigned long fr[64];
|
||
unsigned long fner[2];
|
||
unsigned long msr[2];
|
||
unsigned long acc[8];
|
||
unsigned char accg[8];
|
||
unsigned long fsr[1];
|
||
};
|
||
|
||
struct user_context
|
||
{
|
||
struct user_int_regs i;
|
||
struct user_fpmedia_regs f;
|
||
|
||
void *extension;
|
||
} __attribute__((aligned(8))); */
|
||
|
||
static LONGEST
|
||
frv_linux_sigcontext_reg_addr (struct frame_info *this_frame, int regno,
|
||
CORE_ADDR *sc_addr_cache_ptr)
|
||
{
|
||
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
||
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
||
CORE_ADDR sc_addr;
|
||
|
||
if (sc_addr_cache_ptr && *sc_addr_cache_ptr)
|
||
{
|
||
sc_addr = *sc_addr_cache_ptr;
|
||
}
|
||
else
|
||
{
|
||
CORE_ADDR pc, sp;
|
||
gdb_byte buf[4];
|
||
int tramp_type;
|
||
|
||
pc = get_frame_pc (this_frame);
|
||
tramp_type = frv_linux_pc_in_sigtramp (gdbarch, pc, 0);
|
||
|
||
get_frame_register (this_frame, sp_regnum, buf);
|
||
sp = extract_unsigned_integer (buf, sizeof buf, byte_order);
|
||
|
||
if (tramp_type == NORMAL_SIGTRAMP)
|
||
{
|
||
/* For a normal sigtramp frame, the sigcontext struct starts
|
||
at SP + 8. */
|
||
sc_addr = sp + 8;
|
||
}
|
||
else if (tramp_type == RT_SIGTRAMP)
|
||
{
|
||
/* For a realtime sigtramp frame, SP + 12 contains a pointer
|
||
to a ucontext struct. The ucontext struct contains a
|
||
sigcontext struct starting 24 bytes in. (The offset of
|
||
uc_mcontext within struct ucontext is derived as follows:
|
||
stack_t is a 12-byte struct and struct sigcontext is
|
||
8-byte aligned. This gives an offset of 8 + 12 + 4 (for
|
||
padding) = 24.) */
|
||
if (target_read_memory (sp + 12, buf, sizeof buf) != 0)
|
||
{
|
||
warning (_("Can't read realtime sigtramp frame."));
|
||
return 0;
|
||
}
|
||
sc_addr = extract_unsigned_integer (buf, sizeof buf, byte_order);
|
||
sc_addr += 24;
|
||
}
|
||
else
|
||
internal_error (__FILE__, __LINE__, _("not a signal trampoline"));
|
||
|
||
if (sc_addr_cache_ptr)
|
||
*sc_addr_cache_ptr = sc_addr;
|
||
}
|
||
|
||
switch (regno)
|
||
{
|
||
case psr_regnum :
|
||
return sc_addr + 0;
|
||
/* sc_addr + 4 has "isr", the Integer Status Register. */
|
||
case ccr_regnum :
|
||
return sc_addr + 8;
|
||
case cccr_regnum :
|
||
return sc_addr + 12;
|
||
case lr_regnum :
|
||
return sc_addr + 16;
|
||
case lcr_regnum :
|
||
return sc_addr + 20;
|
||
case pc_regnum :
|
||
return sc_addr + 24;
|
||
/* sc_addr + 28 is __status, the exception status.
|
||
sc_addr + 32 is syscallno, the syscall number or -1.
|
||
sc_addr + 36 is orig_gr8, the original syscall arg #1.
|
||
sc_addr + 40 is gner[0].
|
||
sc_addr + 44 is gner[1]. */
|
||
case iacc0h_regnum :
|
||
return sc_addr + 48;
|
||
case iacc0l_regnum :
|
||
return sc_addr + 52;
|
||
default :
|
||
if (first_gpr_regnum <= regno && regno <= last_gpr_regnum)
|
||
return sc_addr + 56 + 4 * (regno - first_gpr_regnum);
|
||
else if (first_fpr_regnum <= regno && regno <= last_fpr_regnum)
|
||
return sc_addr + 312 + 4 * (regno - first_fpr_regnum);
|
||
else
|
||
return -1; /* not saved. */
|
||
}
|
||
}
|
||
|
||
/* Signal trampolines. */
|
||
|
||
static struct trad_frame_cache *
|
||
frv_linux_sigtramp_frame_cache (struct frame_info *this_frame,
|
||
void **this_cache)
|
||
{
|
||
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
||
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
||
struct trad_frame_cache *cache;
|
||
CORE_ADDR addr;
|
||
gdb_byte buf[4];
|
||
int regnum;
|
||
CORE_ADDR sc_addr_cache_val = 0;
|
||
struct frame_id this_id;
|
||
|
||
if (*this_cache)
|
||
return (struct trad_frame_cache *) *this_cache;
|
||
|
||
cache = trad_frame_cache_zalloc (this_frame);
|
||
|
||
/* FIXME: cagney/2004-05-01: This is is long standing broken code.
|
||
The frame ID's code address should be the start-address of the
|
||
signal trampoline and not the current PC within that
|
||
trampoline. */
|
||
get_frame_register (this_frame, sp_regnum, buf);
|
||
addr = extract_unsigned_integer (buf, sizeof buf, byte_order);
|
||
this_id = frame_id_build (addr, get_frame_pc (this_frame));
|
||
trad_frame_set_id (cache, this_id);
|
||
|
||
for (regnum = 0; regnum < frv_num_regs; regnum++)
|
||
{
|
||
LONGEST reg_addr = frv_linux_sigcontext_reg_addr (this_frame, regnum,
|
||
&sc_addr_cache_val);
|
||
if (reg_addr != -1)
|
||
trad_frame_set_reg_addr (cache, regnum, reg_addr);
|
||
}
|
||
|
||
*this_cache = cache;
|
||
return cache;
|
||
}
|
||
|
||
static void
|
||
frv_linux_sigtramp_frame_this_id (struct frame_info *this_frame,
|
||
void **this_cache,
|
||
struct frame_id *this_id)
|
||
{
|
||
struct trad_frame_cache *cache
|
||
= frv_linux_sigtramp_frame_cache (this_frame, this_cache);
|
||
trad_frame_get_id (cache, this_id);
|
||
}
|
||
|
||
static struct value *
|
||
frv_linux_sigtramp_frame_prev_register (struct frame_info *this_frame,
|
||
void **this_cache, int regnum)
|
||
{
|
||
/* Make sure we've initialized the cache. */
|
||
struct trad_frame_cache *cache
|
||
= frv_linux_sigtramp_frame_cache (this_frame, this_cache);
|
||
return trad_frame_get_register (cache, this_frame, regnum);
|
||
}
|
||
|
||
static int
|
||
frv_linux_sigtramp_frame_sniffer (const struct frame_unwind *self,
|
||
struct frame_info *this_frame,
|
||
void **this_cache)
|
||
{
|
||
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
||
CORE_ADDR pc = get_frame_pc (this_frame);
|
||
const char *name;
|
||
|
||
find_pc_partial_function (pc, &name, NULL, NULL);
|
||
if (frv_linux_pc_in_sigtramp (gdbarch, pc, name))
|
||
return 1;
|
||
|
||
return 0;
|
||
}
|
||
|
||
static const struct frame_unwind frv_linux_sigtramp_frame_unwind =
|
||
{
|
||
SIGTRAMP_FRAME,
|
||
default_frame_unwind_stop_reason,
|
||
frv_linux_sigtramp_frame_this_id,
|
||
frv_linux_sigtramp_frame_prev_register,
|
||
NULL,
|
||
frv_linux_sigtramp_frame_sniffer
|
||
};
|
||
|
||
/* The FRV kernel defines ELF_NGREG as 46. We add 2 in order to include
|
||
the loadmap addresses in the register set. (See below for more info.) */
|
||
#define FRV_ELF_NGREG (46 + 2)
|
||
typedef unsigned char frv_elf_greg_t[4];
|
||
typedef struct { frv_elf_greg_t reg[FRV_ELF_NGREG]; } frv_elf_gregset_t;
|
||
|
||
typedef unsigned char frv_elf_fpreg_t[4];
|
||
typedef struct
|
||
{
|
||
frv_elf_fpreg_t fr[64];
|
||
frv_elf_fpreg_t fner[2];
|
||
frv_elf_fpreg_t msr[2];
|
||
frv_elf_fpreg_t acc[8];
|
||
unsigned char accg[8];
|
||
frv_elf_fpreg_t fsr[1];
|
||
} frv_elf_fpregset_t;
|
||
|
||
/* Register maps. */
|
||
|
||
static const struct regcache_map_entry frv_linux_gregmap[] =
|
||
{
|
||
{ 1, psr_regnum, 4 },
|
||
{ 1, REGCACHE_MAP_SKIP, 4 }, /* isr */
|
||
{ 1, ccr_regnum, 4 },
|
||
{ 1, cccr_regnum, 4 },
|
||
{ 1, lr_regnum, 4 },
|
||
{ 1, lcr_regnum, 4 },
|
||
{ 1, pc_regnum, 4 },
|
||
{ 1, REGCACHE_MAP_SKIP, 4 }, /* __status */
|
||
{ 1, REGCACHE_MAP_SKIP, 4 }, /* syscallno */
|
||
{ 1, REGCACHE_MAP_SKIP, 4 }, /* orig_gr8 */
|
||
{ 1, gner0_regnum, 4 },
|
||
{ 1, gner1_regnum, 4 },
|
||
{ 1, REGCACHE_MAP_SKIP, 8 }, /* iacc0 */
|
||
{ 1, tbr_regnum, 4 },
|
||
{ 31, first_gpr_regnum + 1, 4 }, /* gr1 ... gr31 */
|
||
|
||
/* Technically, the loadmap addresses are not part of `pr_reg' as
|
||
found in the elf_prstatus struct. The fields which communicate
|
||
the loadmap address appear (by design) immediately after
|
||
`pr_reg' though, and the BFD function elf32_frv_grok_prstatus()
|
||
has been implemented to include these fields in the register
|
||
section that it extracts from the core file. So, for our
|
||
purposes, they may be viewed as registers. */
|
||
|
||
{ 1, fdpic_loadmap_exec_regnum, 4 },
|
||
{ 1, fdpic_loadmap_interp_regnum, 4 },
|
||
{ 0 }
|
||
};
|
||
|
||
static const struct regcache_map_entry frv_linux_fpregmap[] =
|
||
{
|
||
{ 64, first_fpr_regnum, 4 }, /* fr0 ... fr63 */
|
||
{ 1, fner0_regnum, 4 },
|
||
{ 1, fner1_regnum, 4 },
|
||
{ 1, msr0_regnum, 4 },
|
||
{ 1, msr1_regnum, 4 },
|
||
{ 8, acc0_regnum, 4 }, /* acc0 ... acc7 */
|
||
{ 1, accg0123_regnum, 4 },
|
||
{ 1, accg4567_regnum, 4 },
|
||
{ 1, fsr0_regnum, 4 },
|
||
{ 0 }
|
||
};
|
||
|
||
/* Unpack an frv_elf_gregset_t into GDB's register cache. */
|
||
|
||
static void
|
||
frv_linux_supply_gregset (const struct regset *regset,
|
||
struct regcache *regcache,
|
||
int regnum, const void *gregs, size_t len)
|
||
{
|
||
int regi;
|
||
|
||
/* gr0 always contains 0. Also, the kernel passes the TBR value in
|
||
this slot. */
|
||
regcache->raw_supply_zeroed (first_gpr_regnum);
|
||
|
||
/* Fill gr32, ..., gr63 with zeros. */
|
||
for (regi = first_gpr_regnum + 32; regi <= last_gpr_regnum; regi++)
|
||
regcache->raw_supply_zeroed (regi);
|
||
|
||
regcache_supply_regset (regset, regcache, regnum, gregs, len);
|
||
}
|
||
|
||
/* FRV Linux kernel register sets. */
|
||
|
||
static const struct regset frv_linux_gregset =
|
||
{
|
||
frv_linux_gregmap,
|
||
frv_linux_supply_gregset, regcache_collect_regset
|
||
};
|
||
|
||
static const struct regset frv_linux_fpregset =
|
||
{
|
||
frv_linux_fpregmap,
|
||
regcache_supply_regset, regcache_collect_regset
|
||
};
|
||
|
||
static void
|
||
frv_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
|
||
iterate_over_regset_sections_cb *cb,
|
||
void *cb_data,
|
||
const struct regcache *regcache)
|
||
{
|
||
cb (".reg", sizeof (frv_elf_gregset_t), sizeof (frv_elf_gregset_t),
|
||
&frv_linux_gregset, NULL, cb_data);
|
||
cb (".reg2", sizeof (frv_elf_fpregset_t), sizeof (frv_elf_fpregset_t),
|
||
&frv_linux_fpregset, NULL, cb_data);
|
||
}
|
||
|
||
|
||
static void
|
||
frv_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
linux_init_abi (info, gdbarch);
|
||
|
||
/* Set the sigtramp frame sniffer. */
|
||
frame_unwind_append_unwinder (gdbarch, &frv_linux_sigtramp_frame_unwind);
|
||
|
||
set_gdbarch_iterate_over_regset_sections
|
||
(gdbarch, frv_linux_iterate_over_regset_sections);
|
||
}
|
||
|
||
static enum gdb_osabi
|
||
frv_linux_elf_osabi_sniffer (bfd *abfd)
|
||
{
|
||
int elf_flags;
|
||
|
||
elf_flags = elf_elfheader (abfd)->e_flags;
|
||
|
||
/* Assume GNU/Linux if using the FDPIC ABI. If/when another OS shows
|
||
up that uses this ABI, we'll need to start using .note sections
|
||
or some such. */
|
||
if (elf_flags & EF_FRV_FDPIC)
|
||
return GDB_OSABI_LINUX;
|
||
else
|
||
return GDB_OSABI_UNKNOWN;
|
||
}
|
||
|
||
void
|
||
_initialize_frv_linux_tdep (void)
|
||
{
|
||
gdbarch_register_osabi (bfd_arch_frv, 0, GDB_OSABI_LINUX,
|
||
frv_linux_init_abi);
|
||
gdbarch_register_osabi_sniffer (bfd_arch_frv,
|
||
bfd_target_elf_flavour,
|
||
frv_linux_elf_osabi_sniffer);
|
||
}
|