%{!static:-rpath-link %R/lib:%R/usr/lib} \
%{!shared: %{pthread:-lpthread} \
%{profile:-lc_p} %{!profile: -lc}}"
+
+/* Do code reading to identify a signal frame, and set the frame
+ state data appropriately. See unwind-dw2.c for the structs. */
+#ifdef IN_LIBGCC2
+#include <signal.h>
+
+/* The third parameter to the signal handler points to something with
+ * this structure defined in asm/ucontext.h, but the name clashes with
+ * struct ucontext from sys/ucontext.h so this private copy is used. */
+typedef struct _sig_ucontext {
+ unsigned long uc_flags;
+ struct _sig_ucontext *uc_link;
+ stack_t uc_stack;
+ struct sigcontext uc_mcontext;
+ sigset_t uc_sigmask;
+} _sig_ucontext_t;
+
+#endif /* IN_LIBGCC2 */
+
+#define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS) \
+ do { \
+ u_int32_t *pc_ = (u_int32_t *) (CONTEXT)->ra; \
+ struct sigcontext *sc_; \
+ _Unwind_Ptr new_cfa_; \
+ int i_; \
+ \
+ /* 24021061 li v0, 0x1061 (rt_sigreturn)*/ \
+ /* 0000000c syscall */ \
+ /* or */ \
+ /* 24021017 li v0, 0x1017 (sigreturn) */ \
+ /* 0000000c syscall */ \
+ if (*(pc_ + 1) != 0x0000000c) \
+ break; \
+ if (*(pc_ + 0) == 0x24021017) \
+ { \
+ struct sigframe { \
+ u_int32_t trampoline[2]; \
+ struct sigcontext sigctx; \
+ } *rt_ = (CONTEXT)->ra; \
+ sc_ = &rt_->sigctx; \
+ } \
+ else if (*(pc_ + 0) == 0x24021061) \
+ { \
+ struct rt_sigframe { \
+ u_int32_t trampoline[2]; \
+ struct siginfo info; \
+ _sig_ucontext_t uc; \
+ } *rt_ = (CONTEXT)->ra; \
+ sc_ = &rt_->uc.uc_mcontext; \
+ } \
+ else \
+ break; \
+ \
+ new_cfa_ = (_Unwind_Ptr)sc_; \
+ (FS)->cfa_how = CFA_REG_OFFSET; \
+ (FS)->cfa_reg = STACK_POINTER_REGNUM; \
+ (FS)->cfa_offset = new_cfa_ - (_Unwind_Ptr) (CONTEXT)->cfa; \
+ \
+ for (i_ = 0; i_ < 32; i_++) { \
+ (FS)->regs.reg[i_].how = REG_SAVED_OFFSET; \
+ (FS)->regs.reg[i_].loc.offset \
+ = (_Unwind_Ptr)&(sc_->sc_regs[i_]) - new_cfa_; \
+ } \
+ (FS)->regs.reg[SIGNAL_UNWIND_RETURN_COLUMN].how = REG_SAVED_OFFSET; \
+ (FS)->regs.reg[SIGNAL_UNWIND_RETURN_COLUMN].loc.offset \
+ = (_Unwind_Ptr)&(sc_->sc_pc) - new_cfa_; \
+ (FS)->retaddr_column = SIGNAL_UNWIND_RETURN_COLUMN; \
+ \
+ goto SUCCESS; \
+ } while (0)
#define DBX_REGISTER_NUMBER(REGNO) mips_dbx_regno[ (REGNO) ]
/* The mapping from gcc register number to DWARF 2 CFA column number. */
-#define DWARF_FRAME_REGNUM(REG) \
- (REG == GP_REG_FIRST + 31 ? DWARF_FRAME_RETURN_COLUMN : REG)
+#define DWARF_FRAME_REGNUM(REG) (REG)
/* The DWARF 2 CFA column which tracks the return address. */
-#define DWARF_FRAME_RETURN_COLUMN (FP_REG_LAST + 1)
+#define DWARF_FRAME_RETURN_COLUMN (GP_REG_FIRST + 31)
+
+/* The DWARF 2 CFA column which tracks the return address from a
+ signal handler context. */
+#define SIGNAL_UNWIND_RETURN_COLUMN (FP_REG_LAST + 1)
/* Before the prologue, RA lives in r31. */
#define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (VOIDmode, GP_REG_FIRST + 31)