/* Target-dependent code for GNU/Linux on MIPS processors.
- Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007, 2008
+ Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Free Software Foundation, Inc.
This file is part of GDB.
#include "symtab.h"
#include "target-descriptions.h"
#include "mips-linux-tdep.h"
+#include "glibc-tdep.h"
static struct target_so_ops mips_svr4_so_ops;
{
CORE_ADDR jb_addr;
struct gdbarch *gdbarch = get_frame_arch (frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
char buf[gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT];
jb_addr = get_frame_register_unsigned (frame, MIPS_A0_REGNUM);
return 0;
*pc = extract_unsigned_integer (buf,
- gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT);
+ gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT,
+ byte_order);
return 1;
}
static void
supply_32bit_reg (struct regcache *regcache, int regnum, const void *addr)
{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
gdb_byte buf[MAX_REGISTER_SIZE];
- store_signed_integer (buf,
- register_size (get_regcache_arch (regcache), regnum),
- extract_signed_integer (addr, 4));
+ store_signed_integer (buf, register_size (gdbarch, regnum), byte_order,
+ extract_signed_integer (addr, 4, byte_order));
regcache_raw_supply (regcache, regnum, buf);
}
{
CORE_ADDR jb_addr;
struct gdbarch *gdbarch = get_frame_arch (frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
void *buf = alloca (gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT);
int element_size = gdbarch_ptr_bit (gdbarch) == 32 ? 4 : 8;
return 0;
*pc = extract_unsigned_integer (buf,
- gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT);
+ gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT,
+ byte_order);
return 1;
}
/* Supply a 64-bit register. */
-void
+static void
supply_64bit_reg (struct regcache *regcache, int regnum,
const gdb_byte *buf)
{
mips64_elf_gregset_t *gregsetp, int regno)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
int regaddr, regi;
mips64_elf_greg_t *regp = *gregsetp;
void *dst;
LONGEST val;
regcache_raw_collect (regcache, regno, buf);
- val = extract_signed_integer (buf, register_size (gdbarch, regno));
+ val = extract_signed_integer (buf, register_size (gdbarch, regno),
+ byte_order);
dst = regp + regaddr;
- store_signed_integer (dst, 8, val);
+ store_signed_integer (dst, 8, byte_order, val);
}
}
mips64_elf_fpregset_t *fpregsetp, int regno)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
gdb_byte *to;
if ((regno >= gdbarch_fp0_regnum (gdbarch))
LONGEST val;
regcache_raw_collect (regcache, regno, buf);
- val = extract_signed_integer (buf, register_size (gdbarch, regno));
+ val = extract_signed_integer (buf, register_size (gdbarch, regno),
+ byte_order);
to = (gdb_byte *) (*fpregsetp + 32);
- store_signed_integer (to, 4, val);
+ store_signed_integer (to, 4, byte_order, val);
}
else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
{
LONGEST val;
regcache_raw_collect (regcache, regno, buf);
- val = extract_signed_integer (buf, register_size (gdbarch, regno));
+ val = extract_signed_integer (buf, register_size (gdbarch, regno),
+ byte_order);
to = (gdb_byte *) (*fpregsetp + 32) + 4;
- store_signed_integer (to, 4, val);
+ store_signed_integer (to, 4, byte_order, val);
}
else if (regno == -1)
{
{
unsigned char buf[28], *p;
ULONGEST insn, insn1;
- int n64 = (mips_abi (current_gdbarch) == MIPS_ABI_N64);
+ int n64 = (mips_abi (target_gdbarch) == MIPS_ABI_N64);
+ enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
read_memory (pc - 12, buf, 28);
p = buf + 12;
while (p >= buf)
{
- insn = extract_unsigned_integer (p, 4);
+ insn = extract_unsigned_integer (p, 4, byte_order);
if (insn == insn1)
break;
p -= 4;
if (p < buf)
return 0;
- insn = extract_unsigned_integer (p + 4, 4);
+ insn = extract_unsigned_integer (p + 4, 4, byte_order);
if (n64)
{
/* daddu t7,ra */
return 0;
}
- insn = extract_unsigned_integer (p + 8, 4);
+ insn = extract_unsigned_integer (p + 8, 4, byte_order);
/* jalr t9,ra */
if (insn != 0x0320f809)
return 0;
- insn = extract_unsigned_integer (p + 12, 4);
+ insn = extract_unsigned_integer (p + 12, 4, byte_order);
if (n64)
{
/* daddiu t8,zero,0 */
}
/* Return non-zero iff PC belongs to the dynamic linker resolution
- code or to a stub. */
+ code, a PLT entry, or a lazy binding stub. */
static int
mips_linux_in_dynsym_resolve_code (CORE_ADDR pc)
{
/* Check whether PC is in the dynamic linker. This also checks
- whether it is in the .plt section, which MIPS does not use. */
+ whether it is in the .plt section, used by non-PIC executables. */
if (svr4_in_dynsym_resolve_code (pc))
return 1;
and glibc_skip_solib_resolver in glibc-tdep.c. The normal glibc
implementation of this triggers at "fixup" from the same objfile as
"_dl_runtime_resolve"; MIPS GNU/Linux can trigger at
- "__dl_runtime_resolve" directly. An unresolved PLT entry will
- point to _dl_runtime_resolve, which will first call
+ "__dl_runtime_resolve" directly. An unresolved lazy binding
+ stub will point to _dl_runtime_resolve, which will first call
__dl_runtime_resolve, and then pass control to the resolved
function. */
if (resolver && SYMBOL_VALUE_ADDRESS (resolver) == pc)
return frame_unwind_caller_pc (get_current_frame ());
- return 0;
+ return glibc_skip_solib_resolver (gdbarch, pc);
}
/* Signal trampoline support. There are four supported layouts for a
struct sigframe {
u32 sf_ass[4]; [argument save space for o32]
- u32 sf_code[2]; [signal trampoline]
+ u32 sf_code[2]; [signal trampoline or fill]
struct sigcontext sf_sc;
sigset_t sf_mask;
};
struct rt_sigframe {
u32 rs_ass[4]; [argument save space for o32]
- u32 rs_code[2] [signal trampoline]
+ u32 rs_code[2] [signal trampoline or fill]
struct siginfo rs_info;
struct ucontext rs_uc;
};
}; */
/* *INDENT-ON* */
-#define SIGFRAME_CODE_OFFSET (4 * 4)
#define SIGFRAME_SIGCONTEXT_OFFSET (6 * 4)
#define RTSIGFRAME_SIGINFO_SIZE 128
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
int ireg, reg_position;
- CORE_ADDR sigcontext_base = func - SIGFRAME_CODE_OFFSET;
+ CORE_ADDR frame_sp = get_frame_sp (this_frame);
+ CORE_ADDR sigcontext_base;
const struct mips_regnum *regs = mips_regnum (gdbarch);
CORE_ADDR regs_base;
if (self == &mips_linux_o32_sigframe)
- sigcontext_base += SIGFRAME_SIGCONTEXT_OFFSET;
+ sigcontext_base = frame_sp + SIGFRAME_SIGCONTEXT_OFFSET;
else
- sigcontext_base += RTSIGFRAME_SIGCONTEXT_OFFSET;
+ sigcontext_base = frame_sp + RTSIGFRAME_SIGCONTEXT_OFFSET;
/* I'm not proud of this hack. Eventually we will have the
infrastructure to indicate the size of saved registers on a
sigcontext_base + SIGCONTEXT_BADVADDR);
/* Choice of the bottom of the sigframe is somewhat arbitrary. */
- trad_frame_set_id (this_cache,
- frame_id_build (func - SIGFRAME_CODE_OFFSET,
- func));
+ trad_frame_set_id (this_cache, frame_id_build (frame_sp, func));
}
/* *INDENT-OFF* */
struct rt_sigframe_n32 {
u32 rs_ass[4]; [ argument save space for o32 ]
- u32 rs_code[2]; [ signal trampoline ]
+ u32 rs_code[2]; [ signal trampoline or fill ]
struct siginfo rs_info;
struct ucontextn32 rs_uc;
};
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
int ireg, reg_position;
- CORE_ADDR sigcontext_base = func - SIGFRAME_CODE_OFFSET;
+ CORE_ADDR frame_sp = get_frame_sp (this_frame);
+ CORE_ADDR sigcontext_base;
const struct mips_regnum *regs = mips_regnum (gdbarch);
if (self == &mips_linux_n32_rt_sigframe)
- sigcontext_base += N32_SIGFRAME_SIGCONTEXT_OFFSET;
+ sigcontext_base = frame_sp + N32_SIGFRAME_SIGCONTEXT_OFFSET;
else
- sigcontext_base += N64_SIGFRAME_SIGCONTEXT_OFFSET;
+ sigcontext_base = frame_sp + N64_SIGFRAME_SIGCONTEXT_OFFSET;
if (mips_linux_restart_reg_p (gdbarch))
trad_frame_set_reg_addr (this_cache,
sigcontext_base + N64_SIGCONTEXT_LO);
/* Choice of the bottom of the sigframe is somewhat arbitrary. */
- trad_frame_set_id (this_cache,
- frame_id_build (func - SIGFRAME_CODE_OFFSET,
- func));
+ trad_frame_set_id (this_cache, frame_id_build (frame_sp, func));
}
static void
return register_size (gdbarch, MIPS_RESTART_REGNUM) > 0;
}
+/* When FRAME is at a syscall instruction, return the PC of the next
+ instruction to be executed. */
+
+static CORE_ADDR
+mips_linux_syscall_next_pc (struct frame_info *frame)
+{
+ CORE_ADDR pc = get_frame_pc (frame);
+ ULONGEST v0 = get_frame_register_unsigned (frame, MIPS_V0_REGNUM);
+
+ /* If we are about to make a sigreturn syscall, use the unwinder to
+ decode the signal frame. */
+ if (v0 == MIPS_NR_sigreturn
+ || v0 == MIPS_NR_rt_sigreturn
+ || v0 == MIPS_NR_N64_rt_sigreturn
+ || v0 == MIPS_NR_N32_rt_sigreturn)
+ return frame_unwind_caller_pc (get_current_frame ());
+
+ return pc + 4;
+}
+
/* Initialize one of the GNU/Linux OS ABIs. */
static void
break;
}
- set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
set_gdbarch_skip_solib_resolver (gdbarch, mips_linux_skip_resolver);
set_gdbarch_software_single_step (gdbarch, mips_software_single_step);
set_gdbarch_core_read_description (gdbarch,
mips_linux_core_read_description);
+ tdep->syscall_next_pc = mips_linux_syscall_next_pc;
+
if (tdesc_data)
{
const struct tdesc_feature *feature;
}
}
+/* Provide a prototype to silence -Wmissing-prototypes. */
+extern initialize_file_ftype _initialize_mips_linux_tdep;
+
void
_initialize_mips_linux_tdep (void)
{
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