diff options
| author | aph <aph@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-05-21 12:31:14 +0000 |
|---|---|---|
| committer | aph <aph@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-05-21 12:31:14 +0000 |
| commit | f204fc480c3fb7cf2953cbda36d5223ceb7a5354 (patch) | |
| tree | 0a15309b1f84d1549cdd918a0bb0a169c3cf4c5f /gcc/config/rs6000/linux.h | |
| parent | d0b0d9d428c4e0b12f1013ccae340f6cdd4e59fc (diff) | |
| download | gcc-f204fc480c3fb7cf2953cbda36d5223ceb7a5354.tar.gz | |
2001-05-17 Andrew Haley <aph@redhat.com>
* config/rs6000/linux.h (MD_FALLBACK_FRAME_STATE_FOR): New.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@42386 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/config/rs6000/linux.h')
| -rw-r--r-- | gcc/config/rs6000/linux.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/gcc/config/rs6000/linux.h b/gcc/config/rs6000/linux.h index f0cf9d18c34..285cf55e5c1 100644 --- a/gcc/config/rs6000/linux.h +++ b/gcc/config/rs6000/linux.h @@ -66,3 +66,56 @@ Boston, MA 02111-1307, USA. */ #ifndef USE_GNULIBC_1 #define DEFAULT_VTABLE_THUNKS 1 #endif + +/* 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> +#include <sys/ucontext.h> +#endif + +#define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS) \ + do { \ + unsigned char *pc_ = (CONTEXT)->ra; \ + struct sigcontext *sc_; \ + long new_cfa_; \ + int i_; \ + \ + /* li r0, 0x7777; sc (rt_sigreturn) */ \ + /* li r0, 0x6666; sc (sigreturn) */ \ + if (((*(unsigned int *) (pc_+0) == 0x38007777) \ + || (*(unsigned int *) (pc_+0) == 0x38006666)) \ + && (*(unsigned int *) (pc_+4) == 0x44000002)) \ + sc_ = (CONTEXT)->cfa + __SIGNAL_FRAMESIZE; \ + else \ + break; \ + \ + new_cfa_ = sc_->regs->gpr[STACK_POINTER_REGNUM]; \ + (FS)->cfa_how = CFA_REG_OFFSET; \ + (FS)->cfa_reg = STACK_POINTER_REGNUM; \ + (FS)->cfa_offset = new_cfa_ - (long) (CONTEXT)->cfa; \ + \ + for (i_ = 0; i_ < 32; i_++) \ + if (i_ != STACK_POINTER_REGNUM) \ + { \ + (FS)->regs.reg[i_].how = REG_SAVED_OFFSET; \ + (FS)->regs.reg[i_].loc.offset \ + = (long)&(sc_->regs->gpr[i_]) - new_cfa_; \ + } \ + \ + (FS)->regs.reg[LINK_REGISTER_REGNUM].how = REG_SAVED_OFFSET; \ + (FS)->regs.reg[LINK_REGISTER_REGNUM].loc.offset \ + = (long)&(sc_->regs->link) - new_cfa_; \ + \ + /* The unwinder expects the IP to point to the following insn, \ + whereas the kernel returns the address of the actual \ + faulting insn. */ \ + sc_->regs->nip += 4; \ + (FS)->regs.reg[CR0_REGNO].how = REG_SAVED_OFFSET; \ + (FS)->regs.reg[CR0_REGNO].loc.offset \ + = (long)&(sc_->regs->nip) - new_cfa_; \ + (FS)->retaddr_column = CR0_REGNO; \ + goto SUCCESS; \ + } while (0) + |