+/* 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
+
+static const struct tramp_frame mips_linux_o32_sigframe = {
+ SIGTRAMP_FRAME,
+ 4,
+ {
+ { MIPS_INST_LI_V0_SIGRETURN, -1 },
+ { MIPS_INST_SYSCALL, -1 },
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ mips_linux_o32_sigframe_init
+};
+
+static const struct tramp_frame mips_linux_o32_rt_sigframe = {
+ SIGTRAMP_FRAME,
+ 4,
+ {
+ { MIPS_INST_LI_V0_RT_SIGRETURN, -1 },
+ { MIPS_INST_SYSCALL, -1 },
+ { TRAMP_SENTINEL_INSN, -1 } },
+ mips_linux_o32_sigframe_init
+};
+
+static const struct tramp_frame mips_linux_n32_rt_sigframe = {
+ SIGTRAMP_FRAME,
+ 4,
+ {
+ { MIPS_INST_LI_V0_N32_RT_SIGRETURN, -1 },
+ { MIPS_INST_SYSCALL, -1 },
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ mips_linux_n32n64_sigframe_init
+};
+
+static const struct tramp_frame mips_linux_n64_rt_sigframe = {
+ SIGTRAMP_FRAME,
+ 4,
+ {
+ { MIPS_INST_LI_V0_N64_RT_SIGRETURN, -1 },
+ { MIPS_INST_SYSCALL, -1 },
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ 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
+
projects / deliverable / binutils-gdb.git / blobdiff