diff options
Diffstat (limited to 'gdb/mips-linux-tdep.c')
| -rw-r--r-- | gdb/mips-linux-tdep.c | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/gdb/mips-linux-tdep.c b/gdb/mips-linux-tdep.c index 7e59eb1..48a82f7 100644 --- a/gdb/mips-linux-tdep.c +++ b/gdb/mips-linux-tdep.c @@ -28,6 +28,8 @@ #include "gdb_string.h" #include "gdb_assert.h" #include "frame.h" +#include "trad-frame.h" +#include "tramp-frame.h" /* Copied from <asm/elf.h>. */ #define ELF_NGREG 45 @@ -797,6 +799,312 @@ mips_linux_skip_resolver (struct gdbarch *gdbarch, CORE_ADDR pc) return 0; } +/* Signal trampoline support. There are four supported layouts for a + signal frame: o32 sigframe, o32 rt_sigframe, n32 rt_sigframe, and + n64 rt_sigframe. We handle them all independently; not the most + efficient way, but simplest. First, declare all the unwinders. */ + +static void mips_linux_o32_sigframe_init (const struct tramp_frame *self, + struct frame_info *next_frame, + struct trad_frame_cache *this_cache, + CORE_ADDR func); + +static void mips_linux_n32n64_sigframe_init (const struct tramp_frame *self, + struct frame_info *next_frame, + struct trad_frame_cache *this_cache, + CORE_ADDR func); + +#define MIPS_NR_LINUX 4000 +#define MIPS_NR_N64_LINUX 5000 +#define MIPS_NR_N32_LINUX 6000 + +#define MIPS_NR_sigreturn MIPS_NR_LINUX + 119 +#define MIPS_NR_rt_sigreturn MIPS_NR_LINUX + 193 +#define MIPS_NR_N64_rt_sigreturn MIPS_NR_N64_LINUX + 211 +#define MIPS_NR_N32_rt_sigreturn MIPS_NR_N32_LINUX + 211 + +#define MIPS_INST_LI_V0_SIGRETURN 0x24020000 + MIPS_NR_sigreturn +#define MIPS_INST_LI_V0_RT_SIGRETURN 0x24020000 + MIPS_NR_rt_sigreturn +#define MIPS_INST_LI_V0_N64_RT_SIGRETURN 0x24020000 + MIPS_NR_N64_rt_sigreturn +#define MIPS_INST_LI_V0_N32_RT_SIGRETURN 0x24020000 + MIPS_NR_N32_rt_sigreturn +#define MIPS_INST_SYSCALL 0x0000000c + +struct tramp_frame mips_linux_o32_sigframe = { + 4, + { MIPS_INST_LI_V0_SIGRETURN, MIPS_INST_SYSCALL, TRAMP_SENTINEL_INSN }, + mips_linux_o32_sigframe_init +}; + +struct tramp_frame mips_linux_o32_rt_sigframe = { + 4, + { MIPS_INST_LI_V0_RT_SIGRETURN, MIPS_INST_SYSCALL, TRAMP_SENTINEL_INSN }, + mips_linux_o32_sigframe_init +}; + +struct tramp_frame mips_linux_n32_rt_sigframe = { + 4, + { MIPS_INST_LI_V0_N32_RT_SIGRETURN, MIPS_INST_SYSCALL, TRAMP_SENTINEL_INSN }, + mips_linux_n32n64_sigframe_init +}; + +struct tramp_frame mips_linux_n64_rt_sigframe = { + 4, + { MIPS_INST_LI_V0_N64_RT_SIGRETURN, MIPS_INST_SYSCALL, TRAMP_SENTINEL_INSN }, + mips_linux_n32n64_sigframe_init +}; + +/* *INDENT-OFF* */ +/* The unwinder for o32 signal frames. The legacy structures look + like this: + + struct sigframe { + u32 sf_ass[4]; [argument save space for o32] + u32 sf_code[2]; [signal trampoline] + struct sigcontext sf_sc; + sigset_t sf_mask; + }; + + struct sigcontext { + unsigned int sc_regmask; [Unused] + unsigned int sc_status; + unsigned long long sc_pc; + unsigned long long sc_regs[32]; + unsigned long long sc_fpregs[32]; + unsigned int sc_ownedfp; + unsigned int sc_fpc_csr; + unsigned int sc_fpc_eir; [Unused] + unsigned int sc_used_math; + unsigned int sc_ssflags; [Unused] + [Alignment hole of four bytes] + unsigned long long sc_mdhi; + unsigned long long sc_mdlo; + + unsigned int sc_cause; [Unused] + unsigned int sc_badvaddr; [Unused] + + unsigned long sc_sigset[4]; [kernel's sigset_t] + }; + + The RT signal frames look like this: + + struct rt_sigframe { + u32 rs_ass[4]; [argument save space for o32] + u32 rs_code[2] [signal trampoline] + struct siginfo rs_info; + struct ucontext rs_uc; + }; + + struct ucontext { + unsigned long uc_flags; + struct ucontext *uc_link; + stack_t uc_stack; + [Alignment hole of four bytes] + struct sigcontext uc_mcontext; + sigset_t uc_sigmask; + }; */ +/* *INDENT-ON* */ + +#define SIGFRAME_CODE_OFFSET (4 * 4) +#define SIGFRAME_SIGCONTEXT_OFFSET (6 * 4) + +#define RTSIGFRAME_SIGINFO_SIZE 128 +#define STACK_T_SIZE (3 * 4) +#define UCONTEXT_SIGCONTEXT_OFFSET (2 * 4 + STACK_T_SIZE + 4) +#define RTSIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \ + + RTSIGFRAME_SIGINFO_SIZE \ + + UCONTEXT_SIGCONTEXT_OFFSET) + +#define SIGCONTEXT_PC (1 * 8) +#define SIGCONTEXT_REGS (2 * 8) +#define SIGCONTEXT_FPREGS (34 * 8) +#define SIGCONTEXT_FPCSR (66 * 8 + 4) +#define SIGCONTEXT_HI (69 * 8) +#define SIGCONTEXT_LO (70 * 8) +#define SIGCONTEXT_CAUSE (71 * 8 + 0) +#define SIGCONTEXT_BADVADDR (71 * 8 + 4) + +#define SIGCONTEXT_REG_SIZE 8 + +static void +mips_linux_o32_sigframe_init (const struct tramp_frame *self, + struct frame_info *next_frame, + struct trad_frame_cache *this_cache, + CORE_ADDR func) +{ + int ireg, reg_position; + CORE_ADDR sigcontext_base = func - SIGFRAME_CODE_OFFSET; + const struct mips_regnum *regs = mips_regnum (current_gdbarch); + + if (self == &mips_linux_o32_sigframe) + sigcontext_base += SIGFRAME_SIGCONTEXT_OFFSET; + else + sigcontext_base += 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 per-frame basis, but + right now we don't; the kernel saves eight bytes but we only want + four. */ + if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) + sigcontext_base += 4; + +#if 0 + trad_frame_set_reg_addr (this_cache, ORIG_ZERO_REGNUM + NUM_REGS, + sigcontext_base + SIGCONTEXT_REGS); +#endif + + for (ireg = 1; ireg < 32; ireg++) + trad_frame_set_reg_addr (this_cache, ireg + ZERO_REGNUM + NUM_REGS, + sigcontext_base + SIGCONTEXT_REGS + + ireg * SIGCONTEXT_REG_SIZE); + + for (ireg = 0; ireg < 32; ireg++) + trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + NUM_REGS, + sigcontext_base + SIGCONTEXT_FPREGS + + ireg * SIGCONTEXT_REG_SIZE); + + trad_frame_set_reg_addr (this_cache, regs->pc + NUM_REGS, + sigcontext_base + SIGCONTEXT_PC); + + trad_frame_set_reg_addr (this_cache, regs->fp_control_status + NUM_REGS, + sigcontext_base + SIGCONTEXT_FPCSR); + trad_frame_set_reg_addr (this_cache, regs->hi + NUM_REGS, + sigcontext_base + SIGCONTEXT_HI); + trad_frame_set_reg_addr (this_cache, regs->lo + NUM_REGS, + sigcontext_base + SIGCONTEXT_LO); + trad_frame_set_reg_addr (this_cache, regs->cause + NUM_REGS, + sigcontext_base + SIGCONTEXT_CAUSE); + trad_frame_set_reg_addr (this_cache, regs->badvaddr + NUM_REGS, + 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)); +} + +/* *INDENT-OFF* */ +/* For N32/N64 things look different. There is no non-rt signal frame. + + struct rt_sigframe_n32 { + u32 rs_ass[4]; [ argument save space for o32 ] + u32 rs_code[2]; [ signal trampoline ] + struct siginfo rs_info; + struct ucontextn32 rs_uc; + }; + + struct ucontextn32 { + u32 uc_flags; + s32 uc_link; + stack32_t uc_stack; + struct sigcontext uc_mcontext; + sigset_t uc_sigmask; [ mask last for extensibility ] + }; + + struct rt_sigframe_n32 { + u32 rs_ass[4]; [ argument save space for o32 ] + u32 rs_code[2]; [ signal trampoline ] + struct siginfo rs_info; + struct ucontext rs_uc; + }; + + struct ucontext { + unsigned long uc_flags; + struct ucontext *uc_link; + stack_t uc_stack; + struct sigcontext uc_mcontext; + sigset_t uc_sigmask; [ mask last for extensibility ] + }; + + And the sigcontext is different (this is for both n32 and n64): + + struct sigcontext { + unsigned long long sc_regs[32]; + unsigned long long sc_fpregs[32]; + unsigned long long sc_mdhi; + unsigned long long sc_mdlo; + unsigned long long sc_pc; + unsigned int sc_status; + unsigned int sc_fpc_csr; + unsigned int sc_fpc_eir; + unsigned int sc_used_math; + unsigned int sc_cause; + unsigned int sc_badvaddr; + }; */ +/* *INDENT-ON* */ + +#define N32_STACK_T_SIZE STACK_T_SIZE +#define N64_STACK_T_SIZE (2 * 8 + 4) +#define N32_UCONTEXT_SIGCONTEXT_OFFSET (2 * 4 + N32_STACK_T_SIZE + 4) +#define N64_UCONTEXT_SIGCONTEXT_OFFSET (2 * 8 + N64_STACK_T_SIZE + 4) +#define N32_SIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \ + + RTSIGFRAME_SIGINFO_SIZE \ + + N32_UCONTEXT_SIGCONTEXT_OFFSET) +#define N64_SIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \ + + RTSIGFRAME_SIGINFO_SIZE \ + + N64_UCONTEXT_SIGCONTEXT_OFFSET) + +#define N64_SIGCONTEXT_REGS (0 * 8) +#define N64_SIGCONTEXT_FPREGS (32 * 8) +#define N64_SIGCONTEXT_HI (64 * 8) +#define N64_SIGCONTEXT_LO (65 * 8) +#define N64_SIGCONTEXT_PC (66 * 8) +#define N64_SIGCONTEXT_FPCSR (67 * 8 + 1 * 4) +#define N64_SIGCONTEXT_FIR (67 * 8 + 2 * 4) +#define N64_SIGCONTEXT_CAUSE (67 * 8 + 4 * 4) +#define N64_SIGCONTEXT_BADVADDR (67 * 8 + 5 * 4) + +#define N64_SIGCONTEXT_REG_SIZE 8 + +static void +mips_linux_n32n64_sigframe_init (const struct tramp_frame *self, + struct frame_info *next_frame, + struct trad_frame_cache *this_cache, + CORE_ADDR func) +{ + int ireg, reg_position; + CORE_ADDR sigcontext_base = func - SIGFRAME_CODE_OFFSET; + const struct mips_regnum *regs = mips_regnum (current_gdbarch); + + if (self == &mips_linux_n32_rt_sigframe) + sigcontext_base += N32_SIGFRAME_SIGCONTEXT_OFFSET; + else + sigcontext_base += N64_SIGFRAME_SIGCONTEXT_OFFSET; + +#if 0 + trad_frame_set_reg_addr (this_cache, ORIG_ZERO_REGNUM + NUM_REGS, + sigcontext_base + N64_SIGCONTEXT_REGS); +#endif + + for (ireg = 1; ireg < 32; ireg++) + trad_frame_set_reg_addr (this_cache, ireg + ZERO_REGNUM + NUM_REGS, + sigcontext_base + N64_SIGCONTEXT_REGS + + ireg * N64_SIGCONTEXT_REG_SIZE); + + for (ireg = 0; ireg < 32; ireg++) + trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + NUM_REGS, + sigcontext_base + N64_SIGCONTEXT_FPREGS + + ireg * N64_SIGCONTEXT_REG_SIZE); + + trad_frame_set_reg_addr (this_cache, regs->pc + NUM_REGS, + sigcontext_base + N64_SIGCONTEXT_PC); + + trad_frame_set_reg_addr (this_cache, regs->fp_control_status + NUM_REGS, + sigcontext_base + N64_SIGCONTEXT_FPCSR); + trad_frame_set_reg_addr (this_cache, regs->hi + NUM_REGS, + sigcontext_base + N64_SIGCONTEXT_HI); + trad_frame_set_reg_addr (this_cache, regs->lo + NUM_REGS, + sigcontext_base + N64_SIGCONTEXT_LO); + trad_frame_set_reg_addr (this_cache, regs->cause + NUM_REGS, + sigcontext_base + N64_SIGCONTEXT_CAUSE); + trad_frame_set_reg_addr (this_cache, regs->badvaddr + NUM_REGS, + sigcontext_base + N64_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)); +} + +/* Initialize one of the GNU/Linux OS ABIs. */ + static void mips_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { @@ -811,6 +1119,8 @@ mips_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 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); + tramp_frame_append (gdbarch, &mips_linux_o32_sigframe); + tramp_frame_append (gdbarch, &mips_linux_o32_rt_sigframe); break; case MIPS_ABI_N32: set_gdbarch_get_longjmp_target (gdbarch, @@ -818,6 +1128,7 @@ mips_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 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); + tramp_frame_append (gdbarch, &mips_linux_n32_rt_sigframe); break; case MIPS_ABI_N64: set_gdbarch_get_longjmp_target (gdbarch, @@ -825,6 +1136,7 @@ mips_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 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); + tramp_frame_append (gdbarch, &mips_linux_n64_rt_sigframe); break; default: internal_error (__FILE__, __LINE__, "can't handle ABI"); |