-/* Target-dependent code for Linux/MIPS.
- Copyright 2001 Free Software Foundation, Inc.
+/* Target-dependent code for GNU/Linux on MIPS processors.
+
+ Copyright 2001, 2002, 2004 Free Software Foundation, Inc.
This file is part of GDB.
#include "gdbcore.h"
#include "target.h"
#include "solib-svr4.h"
+#include "osabi.h"
+#include "mips-tdep.h"
+#include "gdb_string.h"
+#include "gdb_assert.h"
+#include "frame.h"
/* Copied from <asm/elf.h>. */
#define ELF_NGREG 45
/* Figure out where the longjmp will land.
We expect the first arg to be a pointer to the jmp_buf structure from
- which we extract the pc (JB_PC) that we will land at. The pc is copied
- into PC. This routine returns 1 on success. */
+ which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
+ is copied into PC. This routine returns 1 on success. */
-int
+#define MIPS_LINUX_JB_ELEMENT_SIZE 4
+#define MIPS_LINUX_JB_PC 0
+
+static int
mips_linux_get_longjmp_target (CORE_ADDR *pc)
{
CORE_ADDR jb_addr;
jb_addr = read_register (A0_REGNUM);
- if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
- TARGET_PTR_BIT / TARGET_CHAR_BIT))
+ if (target_read_memory (jb_addr
+ + MIPS_LINUX_JB_PC * MIPS_LINUX_JB_ELEMENT_SIZE,
+ buf, TARGET_PTR_BIT / TARGET_CHAR_BIT))
return 0;
- *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
+ *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
return 1;
}
+/* Transform the bits comprising a 32-bit register to the right size
+ for supply_register(). This is needed when mips_regsize() is 8. */
+
+static void
+supply_32bit_reg (int regnum, const void *addr)
+{
+ char buf[MAX_REGISTER_SIZE];
+ store_signed_integer (buf, DEPRECATED_REGISTER_RAW_SIZE (regnum),
+ extract_signed_integer (addr, 4));
+ supply_register (regnum, buf);
+}
+
/* Unpack an elf_gregset_t into GDB's register cache. */
void
{
int regi;
elf_greg_t *regp = *gregsetp;
- static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
+ char zerobuf[MAX_REGISTER_SIZE];
+
+ memset (zerobuf, 0, MAX_REGISTER_SIZE);
for (regi = EF_REG0; regi <= EF_REG31; regi++)
- supply_register ((regi - EF_REG0), (char *)(regp + regi));
+ supply_32bit_reg ((regi - EF_REG0), (char *)(regp + regi));
- supply_register (LO_REGNUM, (char *)(regp + EF_LO));
- supply_register (HI_REGNUM, (char *)(regp + EF_HI));
+ supply_32bit_reg (mips_regnum (current_gdbarch)->lo,
+ (char *)(regp + EF_LO));
+ supply_32bit_reg (mips_regnum (current_gdbarch)->hi,
+ (char *)(regp + EF_HI));
- supply_register (PC_REGNUM, (char *)(regp + EF_CP0_EPC));
- supply_register (BADVADDR_REGNUM, (char *)(regp + EF_CP0_BADVADDR));
- supply_register (PS_REGNUM, (char *)(regp + EF_CP0_STATUS));
- supply_register (CAUSE_REGNUM, (char *)(regp + EF_CP0_CAUSE));
+ supply_32bit_reg (mips_regnum (current_gdbarch)->pc,
+ (char *)(regp + EF_CP0_EPC));
+ supply_32bit_reg (mips_regnum (current_gdbarch)->badvaddr,
+ (char *)(regp + EF_CP0_BADVADDR));
+ supply_32bit_reg (PS_REGNUM, (char *)(regp + EF_CP0_STATUS));
+ supply_32bit_reg (mips_regnum (current_gdbarch)->cause,
+ (char *)(regp + EF_CP0_CAUSE));
/* Fill inaccessible registers with zero. */
- supply_register (FP_REGNUM, zerobuf);
supply_register (UNUSED_REGNUM, zerobuf);
for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++)
supply_register (regi, zerobuf);
{
int regaddr, regi;
elf_greg_t *regp = *gregsetp;
- void *src, *dst;
+ void *dst;
if (regno == -1)
{
memset (regp, 0, sizeof (elf_gregset_t));
for (regi = 0; regi < 32; regi++)
fill_gregset (gregsetp, regi);
- fill_gregset (gregsetp, LO_REGNUM);
- fill_gregset (gregsetp, HI_REGNUM);
- fill_gregset (gregsetp, PC_REGNUM);
- fill_gregset (gregsetp, BADVADDR_REGNUM);
+ fill_gregset (gregsetp, mips_regnum (current_gdbarch)->lo);
+ fill_gregset (gregsetp, mips_regnum (current_gdbarch)->hi);
+ fill_gregset (gregsetp, mips_regnum (current_gdbarch)->pc);
+ fill_gregset (gregsetp, mips_regnum (current_gdbarch)->badvaddr);
fill_gregset (gregsetp, PS_REGNUM);
- fill_gregset (gregsetp, CAUSE_REGNUM);
+ fill_gregset (gregsetp, mips_regnum (current_gdbarch)->cause);
return;
}
if (regno < 32)
{
- src = ®isters[REGISTER_BYTE (regno)];
dst = regp + regno + EF_REG0;
- memcpy (dst, src, sizeof (elf_greg_t));
+ regcache_collect (regno, dst);
return;
}
- regaddr = -1;
- switch (regno)
- {
- case LO_REGNUM:
- regaddr = EF_LO;
- break;
- case HI_REGNUM:
- regaddr = EF_HI;
- break;
- case PC_REGNUM:
- regaddr = EF_CP0_EPC;
- break;
- case BADVADDR_REGNUM:
- regaddr = EF_CP0_BADVADDR;
- break;
- case PS_REGNUM:
- regaddr = EF_CP0_STATUS;
- break;
- case CAUSE_REGNUM:
- regaddr = EF_CP0_CAUSE;
- break;
- }
+ if (regno == mips_regnum (current_gdbarch)->lo)
+ regaddr = EF_LO;
+ else if (regno == mips_regnum (current_gdbarch)->hi)
+ regaddr = EF_HI;
+ else if (regno == mips_regnum (current_gdbarch)->pc)
+ regaddr = EF_CP0_EPC;
+ else if (regno == mips_regnum (current_gdbarch)->badvaddr)
+ regaddr = EF_CP0_BADVADDR;
+ else if (regno == PS_REGNUM)
+ regaddr = EF_CP0_STATUS;
+ else if (regno == mips_regnum (current_gdbarch)->cause)
+ regaddr = EF_CP0_CAUSE;
+ else
+ regaddr = -1;
if (regaddr != -1)
{
- src = ®isters[REGISTER_BYTE (regno)];
dst = regp + regaddr;
- memcpy (dst, src, sizeof (elf_greg_t));
+ regcache_collect (regno, dst);
}
}
void
supply_fpregset (elf_fpregset_t *fpregsetp)
{
- register int regi;
- static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
+ int regi;
+ char zerobuf[MAX_REGISTER_SIZE];
+
+ memset (zerobuf, 0, MAX_REGISTER_SIZE);
for (regi = 0; regi < 32; regi++)
supply_register (FP0_REGNUM + regi,
(char *)(*fpregsetp + regi));
- supply_register (FCRCS_REGNUM, (char *)(*fpregsetp + 32));
+ supply_register (mips_regnum (current_gdbarch)->fp_control_status,
+ (char *)(*fpregsetp + 32));
- /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */
- supply_register (FCRIR_REGNUM, zerobuf);
+ /* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */
+ supply_register (mips_regnum (current_gdbarch)->fp_implementation_revision,
+ zerobuf);
}
/* Likewise, pack one or all floating point registers into an
if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
{
- from = (char *) ®isters[REGISTER_BYTE (regno)];
+ from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
to = (char *) (*fpregsetp + regno - FP0_REGNUM);
- memcpy (to, from, REGISTER_RAW_SIZE (regno - FP0_REGNUM));
+ memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno - FP0_REGNUM));
}
- else if (regno == FCRCS_REGNUM)
+ else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
{
- from = (char *) ®isters[REGISTER_BYTE (regno)];
+ from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
to = (char *) (*fpregsetp + 32);
- memcpy (to, from, REGISTER_RAW_SIZE (regno));
+ memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno));
}
else if (regno == -1)
{
for (regi = 0; regi < 32; regi++)
fill_fpregset (fpregsetp, FP0_REGNUM + regi);
- fill_fpregset(fpregsetp, FCRCS_REGNUM);
+ fill_fpregset(fpregsetp, mips_regnum (current_gdbarch)->fp_control_status);
}
}
/* Map gdb internal register number to ptrace ``address''.
These ``addresses'' are normally defined in <asm/ptrace.h>. */
-CORE_ADDR
-register_addr (int regno, CORE_ADDR blockend)
+static CORE_ADDR
+mips_linux_register_addr (int regno, CORE_ADDR blockend)
{
int regaddr;
if (regno < 32)
regaddr = regno;
- else if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
- regaddr = FPR_BASE + (regno - FP0_REGNUM);
- else if (regno == PC_REGNUM)
+ else if ((regno >= mips_regnum (current_gdbarch)->fp0)
+ && (regno < mips_regnum (current_gdbarch)->fp0 + 32))
+ regaddr = FPR_BASE + (regno - mips_regnum (current_gdbarch)->fp0);
+ else if (regno == mips_regnum (current_gdbarch)->pc)
regaddr = PC;
- else if (regno == CAUSE_REGNUM)
+ else if (regno == mips_regnum (current_gdbarch)->cause)
regaddr = CAUSE;
- else if (regno == BADVADDR_REGNUM)
+ else if (regno == mips_regnum (current_gdbarch)->badvaddr)
regaddr = BADVADDR;
- else if (regno == LO_REGNUM)
+ else if (regno == mips_regnum (current_gdbarch)->lo)
regaddr = MMLO;
- else if (regno == HI_REGNUM)
+ else if (regno == mips_regnum (current_gdbarch)->hi)
regaddr = MMHI;
- else if (regno == FCRCS_REGNUM)
+ else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
regaddr = FPC_CSR;
- else if (regno == FCRIR_REGNUM)
+ else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
regaddr = FPC_EIR;
else
error ("Unknowable register number %d.", regno);
return regaddr;
}
+
+/* Fetch (and possibly build) an appropriate link_map_offsets
+ structure for native GNU/Linux MIPS targets using the struct offsets
+ defined in link.h (but without actual reference to that file).
+
+ This makes it possible to access GNU/Linux MIPS shared libraries from a
+ GDB that was built on a different host platform (for cross debugging). */
+
+static struct link_map_offsets *
+mips_linux_svr4_fetch_link_map_offsets (void)
+{
+ static struct link_map_offsets lmo;
+ static struct link_map_offsets *lmp = NULL;
+
+ if (lmp == NULL)
+ {
+ lmp = &lmo;
+
+ lmo.r_debug_size = 8; /* The actual size is 20 bytes, but
+ this is all we need. */
+ lmo.r_map_offset = 4;
+ lmo.r_map_size = 4;
+
+ lmo.link_map_size = 20;
+
+ lmo.l_addr_offset = 0;
+ lmo.l_addr_size = 4;
+
+ lmo.l_name_offset = 4;
+ lmo.l_name_size = 4;
+
+ lmo.l_next_offset = 12;
+ lmo.l_next_size = 4;
+
+ lmo.l_prev_offset = 16;
+ lmo.l_prev_size = 4;
+ }
+
+ return lmp;
+}
+
+/* Support for 64-bit ABIs. */
+
+/* Copied from <asm/elf.h>. */
+#define MIPS64_ELF_NGREG 45
+#define MIPS64_ELF_NFPREG 33
+
+typedef unsigned char mips64_elf_greg_t[8];
+typedef mips64_elf_greg_t mips64_elf_gregset_t[MIPS64_ELF_NGREG];
+
+typedef unsigned char mips64_elf_fpreg_t[8];
+typedef mips64_elf_fpreg_t mips64_elf_fpregset_t[MIPS64_ELF_NFPREG];
+
+/* 0 - 31 are integer registers, 32 - 63 are fp registers. */
+#define MIPS64_FPR_BASE 32
+#define MIPS64_PC 64
+#define MIPS64_CAUSE 65
+#define MIPS64_BADVADDR 66
+#define MIPS64_MMHI 67
+#define MIPS64_MMLO 68
+#define MIPS64_FPC_CSR 69
+#define MIPS64_FPC_EIR 70
+
+#define MIPS64_EF_REG0 0
+#define MIPS64_EF_REG31 31
+#define MIPS64_EF_LO 32
+#define MIPS64_EF_HI 33
+#define MIPS64_EF_CP0_EPC 34
+#define MIPS64_EF_CP0_BADVADDR 35
+#define MIPS64_EF_CP0_STATUS 36
+#define MIPS64_EF_CP0_CAUSE 37
+
+#define MIPS64_EF_SIZE 304
+
+/* Figure out where the longjmp will land.
+ We expect the first arg to be a pointer to the jmp_buf structure from
+ which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
+ is copied into PC. This routine returns 1 on success. */
+
+/* Details about jmp_buf. */
+
+#define MIPS64_LINUX_JB_PC 0
+
+static int
+mips64_linux_get_longjmp_target (CORE_ADDR *pc)
+{
+ CORE_ADDR jb_addr;
+ void *buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
+ int element_size = TARGET_PTR_BIT == 32 ? 4 : 8;
+
+ jb_addr = read_register (A0_REGNUM);
+
+ if (target_read_memory (jb_addr + MIPS64_LINUX_JB_PC * element_size,
+ buf, TARGET_PTR_BIT / TARGET_CHAR_BIT))
+ return 0;
+
+ *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
+
+ return 1;
+}
+
+/* Unpack an elf_gregset_t into GDB's register cache. */
+
+static void
+mips64_supply_gregset (mips64_elf_gregset_t *gregsetp)
+{
+ int regi;
+ mips64_elf_greg_t *regp = *gregsetp;
+ char zerobuf[MAX_REGISTER_SIZE];
+
+ memset (zerobuf, 0, MAX_REGISTER_SIZE);
+
+ for (regi = MIPS64_EF_REG0; regi <= MIPS64_EF_REG31; regi++)
+ supply_register ((regi - MIPS64_EF_REG0), (char *)(regp + regi));
+
+ supply_register (mips_regnum (current_gdbarch)->lo,
+ (char *)(regp + MIPS64_EF_LO));
+ supply_register (mips_regnum (current_gdbarch)->hi,
+ (char *)(regp + MIPS64_EF_HI));
+
+ supply_register (mips_regnum (current_gdbarch)->pc,
+ (char *)(regp + MIPS64_EF_CP0_EPC));
+ supply_register (mips_regnum (current_gdbarch)->badvaddr,
+ (char *)(regp + MIPS64_EF_CP0_BADVADDR));
+ supply_register (PS_REGNUM, (char *)(regp + MIPS64_EF_CP0_STATUS));
+ supply_register (mips_regnum (current_gdbarch)->cause,
+ (char *)(regp + MIPS64_EF_CP0_CAUSE));
+
+ /* Fill inaccessible registers with zero. */
+ supply_register (UNUSED_REGNUM, zerobuf);
+ for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++)
+ supply_register (regi, zerobuf);
+}
+
+/* Pack our registers (or one register) into an elf_gregset_t. */
+
+static void
+mips64_fill_gregset (mips64_elf_gregset_t *gregsetp, int regno)
+{
+ int regaddr, regi;
+ mips64_elf_greg_t *regp = *gregsetp;
+ void *src, *dst;
+
+ if (regno == -1)
+ {
+ memset (regp, 0, sizeof (mips64_elf_gregset_t));
+ for (regi = 0; regi < 32; regi++)
+ mips64_fill_gregset (gregsetp, regi);
+ mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->lo);
+ mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->hi);
+ mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->pc);
+ mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->badvaddr);
+ mips64_fill_gregset (gregsetp, PS_REGNUM);
+ mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->cause);
+
+ return;
+ }
+
+ if (regno < 32)
+ {
+ dst = regp + regno + MIPS64_EF_REG0;
+ regcache_collect (regno, dst);
+ return;
+ }
+
+ if (regno == mips_regnum (current_gdbarch)->lo)
+ regaddr = MIPS64_EF_LO;
+ else if (regno == mips_regnum (current_gdbarch)->hi)
+ regaddr = MIPS64_EF_HI;
+ else if (regno == mips_regnum (current_gdbarch)->pc)
+ regaddr = MIPS64_EF_CP0_EPC;
+ else if (regno == mips_regnum (current_gdbarch)->badvaddr)
+ regaddr = MIPS64_EF_CP0_BADVADDR;
+ else if (regno == PS_REGNUM)
+ regaddr = MIPS64_EF_CP0_STATUS;
+ else if (regno == mips_regnum (current_gdbarch)->cause)
+ regaddr = MIPS64_EF_CP0_CAUSE;
+ else
+ regaddr = -1;
+
+ if (regaddr != -1)
+ {
+ dst = regp + regaddr;
+ regcache_collect (regno, dst);
+ }
+}
+
+/* Likewise, unpack an elf_fpregset_t. */
+
+static void
+mips64_supply_fpregset (mips64_elf_fpregset_t *fpregsetp)
+{
+ int regi;
+ char zerobuf[MAX_REGISTER_SIZE];
+
+ memset (zerobuf, 0, MAX_REGISTER_SIZE);
+
+ for (regi = 0; regi < 32; regi++)
+ supply_register (FP0_REGNUM + regi,
+ (char *)(*fpregsetp + regi));
+
+ supply_register (mips_regnum (current_gdbarch)->fp_control_status,
+ (char *)(*fpregsetp + 32));
+
+ /* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */
+ supply_register (mips_regnum (current_gdbarch)->fp_implementation_revision,
+ zerobuf);
+}
+
+/* Likewise, pack one or all floating point registers into an
+ elf_fpregset_t. */
+
+static void
+mips64_fill_fpregset (mips64_elf_fpregset_t *fpregsetp, int regno)
+{
+ char *from, *to;
+
+ if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
+ {
+ from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
+ to = (char *) (*fpregsetp + regno - FP0_REGNUM);
+ memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno - FP0_REGNUM));
+ }
+ else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
+ {
+ from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
+ to = (char *) (*fpregsetp + 32);
+ memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno));
+ }
+ else if (regno == -1)
+ {
+ int regi;
+
+ for (regi = 0; regi < 32; regi++)
+ mips64_fill_fpregset (fpregsetp, FP0_REGNUM + regi);
+ mips64_fill_fpregset(fpregsetp,
+ mips_regnum (current_gdbarch)->fp_control_status);
+ }
+}
+
+
+/* Map gdb internal register number to ptrace ``address''.
+ These ``addresses'' are normally defined in <asm/ptrace.h>. */
+
+static CORE_ADDR
+mips64_linux_register_addr (int regno, CORE_ADDR blockend)
+{
+ int regaddr;
+
+ if (regno < 0 || regno >= NUM_REGS)
+ error ("Bogon register number %d.", regno);
+
+ if (regno < 32)
+ regaddr = regno;
+ else if ((regno >= mips_regnum (current_gdbarch)->fp0)
+ && (regno < mips_regnum (current_gdbarch)->fp0 + 32))
+ regaddr = MIPS64_FPR_BASE + (regno - FP0_REGNUM);
+ else if (regno == mips_regnum (current_gdbarch)->pc)
+ regaddr = MIPS64_PC;
+ else if (regno == mips_regnum (current_gdbarch)->cause)
+ regaddr = MIPS64_CAUSE;
+ else if (regno == mips_regnum (current_gdbarch)->badvaddr)
+ regaddr = MIPS64_BADVADDR;
+ else if (regno == mips_regnum (current_gdbarch)->lo)
+ regaddr = MIPS64_MMLO;
+ else if (regno == mips_regnum (current_gdbarch)->hi)
+ regaddr = MIPS64_MMHI;
+ else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
+ regaddr = MIPS64_FPC_CSR;
+ else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
+ regaddr = MIPS64_FPC_EIR;
+ else
+ error ("Unknowable register number %d.", regno);
+
+ return regaddr;
+}
+
/* Use a local version of this function to get the correct types for
regsets, until multi-arch core support is ready. */
{
elf_gregset_t gregset;
elf_fpregset_t fpregset;
+ mips64_elf_gregset_t gregset64;
+ mips64_elf_fpregset_t fpregset64;
if (which == 0)
{
- if (core_reg_size != sizeof (gregset))
+ if (core_reg_size == sizeof (gregset))
{
- warning ("wrong size gregset struct in core file");
+ memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
+ supply_gregset (&gregset);
+ }
+ else if (core_reg_size == sizeof (gregset64))
+ {
+ memcpy ((char *) &gregset64, core_reg_sect, sizeof (gregset64));
+ mips64_supply_gregset (&gregset64);
}
else
{
- memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
- supply_gregset (&gregset);
+ warning ("wrong size gregset struct in core file");
}
}
else if (which == 2)
{
- if (core_reg_size != sizeof (fpregset))
+ if (core_reg_size == sizeof (fpregset))
{
- warning ("wrong size fpregset struct in core file");
+ memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
+ supply_fpregset (&fpregset);
+ }
+ else if (core_reg_size == sizeof (fpregset64))
+ {
+ memcpy ((char *) &fpregset64, core_reg_sect, sizeof (fpregset64));
+ mips64_supply_fpregset (&fpregset64);
}
else
{
- memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
- supply_fpregset (&fpregset);
+ warning ("wrong size fpregset struct in core file");
}
}
}
};
/* Fetch (and possibly build) an appropriate link_map_offsets
- structure for native Linux/MIPS targets using the struct offsets
+ structure for native GNU/Linux MIPS targets using the struct offsets
defined in link.h (but without actual reference to that file).
- This makes it possible to access Linux/MIPS shared libraries from a
- GDB that was not built on an Linux/MIPS host (for cross debugging). */
+ This makes it possible to access GNU/Linux MIPS shared libraries from a
+ GDB that was built on a different host platform (for cross debugging). */
-struct link_map_offsets *
-mips_linux_svr4_fetch_link_map_offsets (void)
+static struct link_map_offsets *
+mips64_linux_svr4_fetch_link_map_offsets (void)
{
static struct link_map_offsets lmo;
static struct link_map_offsets *lmp = NULL;
{
lmp = &lmo;
- lmo.r_debug_size = 8; /* The actual size is 20 bytes, but
+ lmo.r_debug_size = 16; /* The actual size is 40 bytes, but
this is all we need. */
- lmo.r_map_offset = 4;
- lmo.r_map_size = 4;
+ lmo.r_map_offset = 8;
+ lmo.r_map_size = 8;
- lmo.link_map_size = 20;
+ lmo.link_map_size = 40;
lmo.l_addr_offset = 0;
- lmo.l_addr_size = 4;
+ lmo.l_addr_size = 8;
- lmo.l_name_offset = 4;
- lmo.l_name_size = 4;
+ lmo.l_name_offset = 8;
+ lmo.l_name_size = 8;
- lmo.l_next_offset = 12;
- lmo.l_next_size = 4;
+ lmo.l_next_offset = 24;
+ lmo.l_next_size = 8;
- lmo.l_prev_offset = 16;
- lmo.l_prev_size = 4;
+ lmo.l_prev_offset = 32;
+ lmo.l_prev_size = 8;
}
return lmp;
}
+/* Handle for obtaining pointer to the current register_addr() function
+ for a given architecture. */
+static struct gdbarch_data *register_addr_data;
+
+CORE_ADDR
+register_addr (int regno, CORE_ADDR blockend)
+{
+ CORE_ADDR (*register_addr_ptr) (int, CORE_ADDR) =
+ gdbarch_data (current_gdbarch, register_addr_data);
+
+ gdb_assert (register_addr_ptr != 0);
+
+ return register_addr_ptr (regno, blockend);
+}
+
+static void
+set_mips_linux_register_addr (struct gdbarch *gdbarch,
+ CORE_ADDR (*register_addr_ptr) (int, CORE_ADDR))
+{
+ set_gdbarch_data (gdbarch, register_addr_data, register_addr_ptr);
+}
+
+static void *
+init_register_addr_data (struct gdbarch *gdbarch)
+{
+ return 0;
+}
+
+/* Check the code at PC for a dynamic linker lazy resolution stub. Because
+ they aren't in the .plt section, we pattern-match on the code generated
+ by GNU ld. They look like this:
+
+ lw t9,0x8010(gp)
+ addu t7,ra
+ jalr t9,ra
+ addiu t8,zero,INDEX
+
+ (with the appropriate doubleword instructions for N64). Also return the
+ dynamic symbol index used in the last instruction. */
+
+static int
+mips_linux_in_dynsym_stub (CORE_ADDR pc, char *name)
+{
+ unsigned char buf[28], *p;
+ ULONGEST insn, insn1;
+ int n64 = (mips_abi (current_gdbarch) == MIPS_ABI_N64);
+
+ read_memory (pc - 12, buf, 28);
+
+ if (n64)
+ {
+ /* ld t9,0x8010(gp) */
+ insn1 = 0xdf998010;
+ }
+ else
+ {
+ /* lw t9,0x8010(gp) */
+ insn1 = 0x8f998010;
+ }
+
+ p = buf + 12;
+ while (p >= buf)
+ {
+ insn = extract_unsigned_integer (p, 4);
+ if (insn == insn1)
+ break;
+ p -= 4;
+ }
+ if (p < buf)
+ return 0;
+
+ insn = extract_unsigned_integer (p + 4, 4);
+ if (n64)
+ {
+ /* daddu t7,ra */
+ if (insn != 0x03e0782d)
+ return 0;
+ }
+ else
+ {
+ /* addu t7,ra */
+ if (insn != 0x03e07821)
+ return 0;
+ }
+
+ insn = extract_unsigned_integer (p + 8, 4);
+ /* jalr t9,ra */
+ if (insn != 0x0320f809)
+ return 0;
+
+ insn = extract_unsigned_integer (p + 12, 4);
+ if (n64)
+ {
+ /* daddiu t8,zero,0 */
+ if ((insn & 0xffff0000) != 0x64180000)
+ return 0;
+ }
+ else
+ {
+ /* addiu t8,zero,0 */
+ if ((insn & 0xffff0000) != 0x24180000)
+ return 0;
+ }
+
+ return (insn & 0xffff);
+}
+
+/* Return non-zero iff PC belongs to the dynamic linker resolution code
+ or to a stub. */
+
+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. */
+ if (in_solib_dynsym_resolve_code (pc))
+ return 1;
+
+ /* Pattern match for the stub. It would be nice if there were a more
+ efficient way to avoid this check. */
+ if (mips_linux_in_dynsym_stub (pc, NULL))
+ return 1;
+
+ return 0;
+}
+
+/* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c,
+ 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, and then pass control to the resolved
+ function. */
+
+static CORE_ADDR
+mips_linux_skip_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ struct minimal_symbol *resolver;
+
+ resolver = lookup_minimal_symbol ("__dl_runtime_resolve", NULL, NULL);
+
+ if (resolver && SYMBOL_VALUE_ADDRESS (resolver) == pc)
+ return frame_pc_unwind (get_current_frame ());
+
+ return 0;
+}
+
+static void
+mips_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum mips_abi abi = mips_abi (gdbarch);
+
+ switch (abi)
+ {
+ case MIPS_ABI_O32:
+ set_gdbarch_get_longjmp_target (gdbarch,
+ mips_linux_get_longjmp_target);
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, mips_linux_svr4_fetch_link_map_offsets);
+ set_mips_linux_register_addr (gdbarch, mips_linux_register_addr);
+ break;
+ case MIPS_ABI_N32:
+ set_gdbarch_get_longjmp_target (gdbarch,
+ mips_linux_get_longjmp_target);
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, mips_linux_svr4_fetch_link_map_offsets);
+ set_mips_linux_register_addr (gdbarch, mips64_linux_register_addr);
+ break;
+ case MIPS_ABI_N64:
+ set_gdbarch_get_longjmp_target (gdbarch,
+ mips64_linux_get_longjmp_target);
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, mips64_linux_svr4_fetch_link_map_offsets);
+ set_mips_linux_register_addr (gdbarch, mips64_linux_register_addr);
+ break;
+ default:
+ internal_error (__FILE__, __LINE__, "can't handle ABI");
+ break;
+ }
+
+ set_gdbarch_skip_solib_resolver (gdbarch, mips_linux_skip_resolver);
+
+ /* This overrides the MIPS16 stub support from mips-tdep. But no
+ one uses MIPS16 on GNU/Linux yet, so this isn't much of a loss. */
+ set_gdbarch_in_solib_call_trampoline (gdbarch, mips_linux_in_dynsym_stub);
+}
+
void
-_initialize_mips_linux_tdep ()
+_initialize_mips_linux_tdep (void)
{
+ const struct bfd_arch_info *arch_info;
+
+ register_addr_data =
+ register_gdbarch_data (init_register_addr_data);
+
+ for (arch_info = bfd_lookup_arch (bfd_arch_mips, 0);
+ arch_info != NULL;
+ arch_info = arch_info->next)
+ {
+ gdbarch_register_osabi (bfd_arch_mips, arch_info->mach, GDB_OSABI_LINUX,
+ mips_linux_init_abi);
+ }
+
add_core_fns (®set_core_fns);
}
projects / deliverable / binutils-gdb.git / blobdiff