From 7d05473109738c986965c6f6ef6700c0055ff981 Mon Sep 17 00:00:00 2001 From: danglin Date: Fri, 9 Jul 2004 03:39:35 +0000 Subject: * gcc/config/pa/pa32-linux.h (MD_FALLBACK_FRAME_STATE_FOR): Define. * libjava/configure.in (SIGNAL_HANDLER): Use pa-signal.h for hppa. * libjava/configure: Regenerate. * libjava/configure.host: Set can_unwind_signal for hppa*-linux. * libjava/pa-signal.h: New file. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@84344 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/config/pa/pa32-linux.h | 94 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) (limited to 'gcc/config/pa/pa32-linux.h') diff --git a/gcc/config/pa/pa32-linux.h b/gcc/config/pa/pa32-linux.h index 49439594920..14cc2cf9159 100644 --- a/gcc/config/pa/pa32-linux.h +++ b/gcc/config/pa/pa32-linux.h @@ -35,3 +35,97 @@ Boston, MA 02111-1307, USA. */ __attribute__ ((__unused__, section(".ctors"), \ aligned(sizeof(func_ptr)))) \ = { (func_ptr) (-1) } + +/* 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 +#include + +/* Unfortunately, because of various bugs and changes to the kernel, + we have several cases to deal with. + + In 2.4, the signal trampoline is 4 words, and (CONTEXT)->ra should + point directly at the beginning of the trampoline and struct rt_sigframe. + + In <= 2.6.5-rc2-pa3, the signal trampoline is 9 words, and + (CONTEXT)->ra points at the 4th word in the trampoline structure. This + is wrong, it should point at the 5th word. This is fixed in 2.6.5-rc2-pa4. + + To detect these cases, we first take (CONTEXT)->ra, align it to 64-bytes + to get the beginning of the signal frame, and then check offsets 0, 4 + and 5 to see if we found the beginning of the trampoline. This will + tell us how to locate the sigcontext structure. + + Note that with a 2.4 64-bit kernel, the signal context is not properly + passed back to userspace so the unwind will not work correctly. */ +#define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS) \ + do { \ + unsigned long sp = (unsigned long)(CONTEXT)->ra & ~63; \ + unsigned int *pc = (unsigned int *)sp; \ + unsigned long off; \ + _Unwind_Ptr new_cfa; \ + int i; \ + struct sigcontext *sc; \ + struct rt_sigframe { \ + struct siginfo info; \ + struct ucontext uc; \ + } *frame; \ + \ + /* rt_sigreturn trampoline: \ + 3419000x ldi 0, %r25 or ldi 1, %r25 (x = 0 or 2) \ + 3414015a ldi __NR_rt_sigreturn, %r20 \ + e4008200 be,l 0x100(%sr2, %r0), %sr0, %r31 \ + 08000240 nop */ \ + \ + if (pc[0] == 0x34190000 || pc[0] == 0x34190002) \ + off = 4*4; \ + else if (pc[4] == 0x34190000 || pc[4] == 0x34190002) \ + { \ + pc += 4; \ + off = 10 * 4; \ + } \ + else if (pc[5] == 0x34190000 || pc[5] == 0x34190002) \ + { \ + pc += 5; \ + off = 10 * 4; \ + } \ + else \ + break; \ + if (pc[1] != 0x3414015a \ + || pc[2] != 0xe4008200 \ + || pc[3] != 0x08000240) \ + break; \ + \ + frame = (struct rt_sigframe *)(sp + off); \ + sc = &frame->uc.uc_mcontext; \ + \ + new_cfa = sc->sc_gr[30]; \ + (FS)->cfa_how = CFA_REG_OFFSET; \ + (FS)->cfa_reg = 30; \ + (FS)->cfa_offset = new_cfa - (long) (CONTEXT)->cfa; \ + for (i = 1; i <= 31; i++) \ + { \ + (FS)->regs.reg[i].how = REG_SAVED_OFFSET; \ + (FS)->regs.reg[i].loc.offset = (long)&sc->sc_gr[i] - new_cfa; \ + } \ + for (i = 4; i <= 31; i++) \ + { \ + /* FP regs have left and right halves */ \ + (FS)->regs.reg[2*i+24].how = REG_SAVED_OFFSET; \ + (FS)->regs.reg[2*i+24].loc.offset \ + = (long)&sc->sc_fr[i] - new_cfa; \ + (FS)->regs.reg[2*i+24+1].how = REG_SAVED_OFFSET; \ + (FS)->regs.reg[2*i+24+1].loc.offset \ + = (long)&sc->sc_fr[i] + 4 - new_cfa; \ + } \ + (FS)->regs.reg[88].how = REG_SAVED_OFFSET; \ + (FS)->regs.reg[88].loc.offset = (long) &sc->sc_sar - new_cfa; \ + (FS)->regs.reg[2].how = REG_SAVED_OFFSET; \ + (FS)->regs.reg[2].loc.offset = (long) &sc->sc_iaoq[0] - new_cfa; \ + (FS)->retaddr_column = 2; \ + goto SUCCESS; \ + } while (0) + +#endif /* IN_LIBGCC2 */ -- cgit v1.2.1