diff options
| author | davem <davem@138bc75d-0d04-0410-961f-82ee72b054a4> | 2002-04-27 00:04:14 +0000 |
|---|---|---|
| committer | davem <davem@138bc75d-0d04-0410-961f-82ee72b054a4> | 2002-04-27 00:04:14 +0000 |
| commit | 364730256d41b15e14dc2acc2c1362a161aa5547 (patch) | |
| tree | 8bed0913f39b308ccc8db5c01cfe920e5e291d46 /libjava/include/dwarf2-signal.h | |
| parent | 18fe6a56d778e0e419820df8ebfc9739df31b79d (diff) | |
| download | gcc-364730256d41b15e14dc2acc2c1362a161aa5547.tar.gz | |
2002-04-25 David S. Miller <davem@redhat.com>
PR target/6422
* include/dwarf2-signal.h (MAKE_THROW_FRAME for sparc*): Set
program counter to next program counter minus 8. Update
comments in this macro to explain why.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@52820 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libjava/include/dwarf2-signal.h')
| -rw-r--r-- | libjava/include/dwarf2-signal.h | 34 |
1 files changed, 20 insertions, 14 deletions
diff --git a/libjava/include/dwarf2-signal.h b/libjava/include/dwarf2-signal.h index fa55d4d15a7..b7530b2cbf3 100644 --- a/libjava/include/dwarf2-signal.h +++ b/libjava/include/dwarf2-signal.h @@ -67,11 +67,15 @@ while (0) do \ { \ /* Sparc-32 leaves PC pointing at a faulting instruction \ - always. So we adjust the saved PC to point to the following \ - instruction; this is what the handler in libgcc expects. */ \ - /* Note that we are lying to the unwinder here, which expects the \ - faulting pc, not pc+1. But we claim the unwind information can't \ - be changed by such a ld or st instruction, so it doesn't matter. */ \ + always. \ + We advance the PC one instruction past the exception causing PC. \ + This is done because FDEs are found with "context->ra - 1" in the \ + unwinder. \ + Also, the dwarf2 unwind machinery is going to add 8 to the \ + PC it uses on Sparc. So we adjust the PC here. We do it here \ + because we run once for such an exception, however the Sparc specific\ + unwind can run multiple times for the same exception and it would \ + adjust the PC more than once resulting in a bogus value. */ \ struct sig_regs { \ unsigned int psr, pc, npc, y, u_regs[16]; \ } *regp; \ @@ -83,8 +87,7 @@ do \ else \ /* mov __NR_rt_sigaction, %g1; New signal stack layout */ \ regp = (struct sig_regs *) (_sip + 1); \ - regp->pc = regp->npc; \ - regp->npc += 4; \ + regp->pc = ((regp->pc + 4) - 8); \ } \ while (0) #else @@ -92,18 +95,21 @@ while (0) do \ { \ /* Sparc-64 leaves PC pointing at a faulting instruction \ - always. So we adjust the saved PC to point to the following \ - instruction; this is what the handler in libgcc expects. */ \ - /* Note that we are lying to the unwinder here, which expects the \ - faulting pc, not pc+1. But we claim the unwind information can't \ - be changed by such a ld or st instruction, so it doesn't matter. */ \ + always. \ + We advance the PC one instruction past the exception causing PC. \ + This is done because FDEs are found with "context->ra - 1" in the \ + unwinder. \ + Also, the dwarf2 unwind machinery is going to add 8 to the \ + PC it uses on Sparc. So we adjust the PC here. We do it here \ + because we run once for such an exception, however the Sparc specific\ + unwind can run multiple times for the same exception and it would \ + adjust the PC more than once resulting in a bogus value. */ \ struct pt_regs { \ unsigned long u_regs[16]; \ unsigned long tstate, tpc, tnpc; \ unsigned int y, fprs; \ } *regp = (struct pt_regs *) (_sip + 1); \ - regp->tpc = regp->tnpc; \ - regp->tnpc += 4; \ + regp->tpc = ((regp->tpc + 4) - 8); \ } \ while (0) #endif |