#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
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)
{
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,
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,
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");
projects / binutils-gdb.git / commitdiff