diff options
Diffstat (limited to 'gdb/mips-linux-tdep.c')
| -rw-r--r-- | gdb/mips-linux-tdep.c | 444 |
1 files changed, 405 insertions, 39 deletions
diff --git a/gdb/mips-linux-tdep.c b/gdb/mips-linux-tdep.c index e5aecfffdac..ae4e6897949 100644 --- a/gdb/mips-linux-tdep.c +++ b/gdb/mips-linux-tdep.c @@ -24,7 +24,9 @@ #include "target.h" #include "solib-svr4.h" #include "osabi.h" +#include "mips-tdep.h" #include "gdb_string.h" +#include "gdb_assert.h" /* Copied from <asm/elf.h>. */ #define ELF_NGREG 45 @@ -83,6 +85,18 @@ mips_linux_get_longjmp_target (CORE_ADDR *pc) 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 = alloca (MAX_REGISTER_RAW_SIZE); + store_signed_integer (buf, REGISTER_RAW_SIZE (regnum), + extract_signed_integer (addr, 4)); + supply_register (regnum, buf); +} + /* Unpack an elf_gregset_t into GDB's register cache. */ void @@ -95,15 +109,15 @@ supply_gregset (elf_gregset_t *gregsetp) memset (zerobuf, 0, MAX_REGISTER_RAW_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 (LO_REGNUM, (char *)(regp + EF_LO)); + supply_32bit_reg (HI_REGNUM, (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 (PC_REGNUM, (char *)(regp + EF_CP0_EPC)); + supply_32bit_reg (BADVADDR_REGNUM, (char *)(regp + EF_CP0_BADVADDR)); + supply_32bit_reg (PS_REGNUM, (char *)(regp + EF_CP0_STATUS)); + supply_32bit_reg (CAUSE_REGNUM, (char *)(regp + EF_CP0_CAUSE)); /* Fill inaccessible registers with zero. */ supply_register (UNUSED_REGNUM, zerobuf); @@ -118,7 +132,7 @@ fill_gregset (elf_gregset_t *gregsetp, int regno) { int regaddr, regi; elf_greg_t *regp = *gregsetp; - void *src, *dst; + void *dst; if (regno == -1) { @@ -137,9 +151,8 @@ fill_gregset (elf_gregset_t *gregsetp, int regno) if (regno < 32) { - src = &deprecated_registers[REGISTER_BYTE (regno)]; dst = regp + regno + EF_REG0; - memcpy (dst, src, sizeof (elf_greg_t)); + regcache_collect (regno, dst); return; } @@ -168,9 +181,8 @@ fill_gregset (elf_gregset_t *gregsetp, int regno) if (regaddr != -1) { - src = &deprecated_registers[REGISTER_BYTE (regno)]; dst = regp + regaddr; - memcpy (dst, src, sizeof (elf_greg_t)); + regcache_collect (regno, dst); } } @@ -227,8 +239,8 @@ fill_fpregset (elf_fpregset_t *fpregsetp, int regno) /* 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; @@ -259,6 +271,282 @@ register_addr (int regno, CORE_ADDR blockend) 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_address (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 = alloca (MAX_REGISTER_RAW_SIZE); + + memset (zerobuf, 0, MAX_REGISTER_RAW_SIZE); + + for (regi = MIPS64_EF_REG0; regi <= MIPS64_EF_REG31; regi++) + supply_register ((regi - MIPS64_EF_REG0), (char *)(regp + regi)); + + supply_register (LO_REGNUM, (char *)(regp + MIPS64_EF_LO)); + supply_register (HI_REGNUM, (char *)(regp + MIPS64_EF_HI)); + + supply_register (PC_REGNUM, (char *)(regp + MIPS64_EF_CP0_EPC)); + supply_register (BADVADDR_REGNUM, (char *)(regp + MIPS64_EF_CP0_BADVADDR)); + supply_register (PS_REGNUM, (char *)(regp + MIPS64_EF_CP0_STATUS)); + supply_register (CAUSE_REGNUM, (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, LO_REGNUM); + mips64_fill_gregset (gregsetp, HI_REGNUM); + mips64_fill_gregset (gregsetp, PC_REGNUM); + mips64_fill_gregset (gregsetp, BADVADDR_REGNUM); + mips64_fill_gregset (gregsetp, PS_REGNUM); + mips64_fill_gregset (gregsetp, CAUSE_REGNUM); + + return; + } + + if (regno < 32) + { + dst = regp + regno + MIPS64_EF_REG0; + regcache_collect (regno, dst); + return; + } + + regaddr = -1; + switch (regno) + { + case LO_REGNUM: + regaddr = MIPS64_EF_LO; + break; + case HI_REGNUM: + regaddr = MIPS64_EF_HI; + break; + case PC_REGNUM: + regaddr = MIPS64_EF_CP0_EPC; + break; + case BADVADDR_REGNUM: + regaddr = MIPS64_EF_CP0_BADVADDR; + break; + case PS_REGNUM: + regaddr = MIPS64_EF_CP0_STATUS; + break; + case CAUSE_REGNUM: + regaddr = MIPS64_EF_CP0_CAUSE; + break; + } + + 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) +{ + register int regi; + char *zerobuf = alloca (MAX_REGISTER_RAW_SIZE); + + memset (zerobuf, 0, MAX_REGISTER_RAW_SIZE); + + for (regi = 0; regi < 32; regi++) + supply_register (FP0_REGNUM + regi, + (char *)(*fpregsetp + regi)); + + supply_register (FCRCS_REGNUM, (char *)(*fpregsetp + 32)); + + /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */ + supply_register (FCRIR_REGNUM, 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[REGISTER_BYTE (regno)]; + to = (char *) (*fpregsetp + regno - FP0_REGNUM); + memcpy (to, from, REGISTER_RAW_SIZE (regno - FP0_REGNUM)); + } + else if (regno == FCRCS_REGNUM) + { + from = (char *) &deprecated_registers[REGISTER_BYTE (regno)]; + to = (char *) (*fpregsetp + 32); + memcpy (to, from, 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, FCRCS_REGNUM); + } +} + + +/* 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 >= FP0_REGNUM) && (regno < FP0_REGNUM + 32)) + regaddr = MIPS64_FPR_BASE + (regno - FP0_REGNUM); + else if (regno == PC_REGNUM) + regaddr = MIPS64_PC; + else if (regno == CAUSE_REGNUM) + regaddr = MIPS64_CAUSE; + else if (regno == BADVADDR_REGNUM) + regaddr = MIPS64_BADVADDR; + else if (regno == LO_REGNUM) + regaddr = MIPS64_MMLO; + else if (regno == HI_REGNUM) + regaddr = MIPS64_MMHI; + else if (regno == FCRCS_REGNUM) + regaddr = MIPS64_FPC_CSR; + else if (regno == FCRIR_REGNUM) + 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. */ @@ -268,29 +556,41 @@ fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, { 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"); } } } @@ -315,7 +615,7 @@ static struct core_fns regset_core_fns = 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) +mips64_linux_svr4_fetch_link_map_offsets (void) { static struct link_map_offsets lmo; static struct link_map_offsets *lmp = NULL; @@ -324,41 +624,107 @@ mips_linux_svr4_fetch_link_map_offsets (void) { 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; +} + static void mips_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { - 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); + 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; + } } void _initialize_mips_linux_tdep (void) { - gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_LINUX, - mips_linux_init_abi); + const struct bfd_arch_info *arch_info; + + register_addr_data = + register_gdbarch_data (init_register_addr_data, 0); + + 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); } |