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/* Target-dependent code for GNU/Linux running on the Fujitsu FR-V,
for GDB.
Copyright (C) 2004, 2006-2012 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
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 <>. */
#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 "gdb_string.h"
#include "linux-tdep.h"
/* Define the size (in bytes) of an FR-V instruction. */
static const int frv_instr_size = 4;
enum {
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);
char 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 */
else if (instr -= 0x8efc00ad) /* setlos #__NR_rt_sigreturn, gr7 */
retval = RT_SIGTRAMP;
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
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;
CORE_ADDR pc, sp;
char 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;
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);
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);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
struct trad_frame_cache *cache;
char buf[4];
int regnum;
CORE_ADDR sc_addr_cache_val = 0;
struct frame_id this_id;
if (*this_cache)
return *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,
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 =
/* 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;
/* Constants for accessing elements of frv_elf_gregset_t. */
#define FRV_PT_PSR 0
#define FRV_PT_ISR 1
#define FRV_PT_CCR 2
#define FRV_PT_CCCR 3
#define FRV_PT_LR 4
#define FRV_PT_LCR 5
#define FRV_PT_PC 6
#define FRV_PT_GNER0 10
#define FRV_PT_GNER1 11
#define FRV_PT_IACC0H 12
#define FRV_PT_IACC0L 13
/* Note: Only 32 of the GRs will be found in the corefile. */
#define FRV_PT_GR(j) ( 14 + (j)) /* GRj for 0<=j<=63. */
#define FRV_PT_TBR FRV_PT_GR(0) /* gr0 is always 0, so TBR is stuffed
there. */
/* 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. */
/* 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;
char zerobuf[MAX_REGISTER_SIZE];
const frv_elf_gregset_t *gregsetp = gregs;
memset (zerobuf, 0, MAX_REGISTER_SIZE);
/* gr0 always contains 0. Also, the kernel passes the TBR value in
this slot. */
regcache_raw_supply (regcache, first_gpr_regnum, zerobuf);
for (regi = first_gpr_regnum + 1; regi <= last_gpr_regnum; regi++)
if (regi >= first_gpr_regnum + 32)
regcache_raw_supply (regcache, regi, zerobuf);
regcache_raw_supply (regcache, regi,
gregsetp->reg[FRV_PT_GR (regi
- first_gpr_regnum)]);
regcache_raw_supply (regcache, pc_regnum, gregsetp->reg[FRV_PT_PC]);
regcache_raw_supply (regcache, psr_regnum, gregsetp->reg[FRV_PT_PSR]);
regcache_raw_supply (regcache, ccr_regnum, gregsetp->reg[FRV_PT_CCR]);
regcache_raw_supply (regcache, cccr_regnum, gregsetp->reg[FRV_PT_CCCR]);
regcache_raw_supply (regcache, lr_regnum, gregsetp->reg[FRV_PT_LR]);
regcache_raw_supply (regcache, lcr_regnum, gregsetp->reg[FRV_PT_LCR]);
regcache_raw_supply (regcache, gner0_regnum, gregsetp->reg[FRV_PT_GNER0]);
regcache_raw_supply (regcache, gner1_regnum, gregsetp->reg[FRV_PT_GNER1]);
regcache_raw_supply (regcache, tbr_regnum, gregsetp->reg[FRV_PT_TBR]);
regcache_raw_supply (regcache, fdpic_loadmap_exec_regnum,
regcache_raw_supply (regcache, fdpic_loadmap_interp_regnum,
/* Unpack an frv_elf_fpregset_t into GDB's register cache. */
static void
frv_linux_supply_fpregset (const struct regset *regset,
struct regcache *regcache,
int regnum, const void *gregs, size_t len)
int regi;
const frv_elf_fpregset_t *fpregsetp = gregs;
for (regi = first_fpr_regnum; regi <= last_fpr_regnum; regi++)
regcache_raw_supply (regcache, regi,
fpregsetp->fr[regi - first_fpr_regnum]);
regcache_raw_supply (regcache, fner0_regnum, fpregsetp->fner[0]);
regcache_raw_supply (regcache, fner1_regnum, fpregsetp->fner[1]);
regcache_raw_supply (regcache, msr0_regnum, fpregsetp->msr[0]);
regcache_raw_supply (regcache, msr1_regnum, fpregsetp->msr[1]);
for (regi = acc0_regnum; regi <= acc7_regnum; regi++)
regcache_raw_supply (regcache, regi, fpregsetp->acc[regi - acc0_regnum]);
regcache_raw_supply (regcache, accg0123_regnum, fpregsetp->accg);
regcache_raw_supply (regcache, accg4567_regnum, fpregsetp->accg + 4);
regcache_raw_supply (regcache, fsr0_regnum, fpregsetp->fsr[0]);
/* FRV Linux kernel register sets. */
static struct regset frv_linux_gregset =
static struct regset frv_linux_fpregset =
static const struct regset *
frv_linux_regset_from_core_section (struct gdbarch *gdbarch,
const char *sect_name, size_t sect_size)
if (strcmp (sect_name, ".reg") == 0
&& sect_size >= sizeof (frv_elf_gregset_t))
return &frv_linux_gregset;
if (strcmp (sect_name, ".reg2") == 0
&& sect_size >= sizeof (frv_elf_fpregset_t))
return &frv_linux_fpregset;
return NULL;
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_regset_from_core_section (gdbarch,
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)
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_frv_linux_tdep (void);
_initialize_frv_linux_tdep (void)
gdbarch_register_osabi (bfd_arch_frv, 0, GDB_OSABI_LINUX,
gdbarch_register_osabi_sniffer (bfd_arch_frv,