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x64: Workaround for libgcc unwind bug (still present in RHEL 5.5).

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This commit is contained in:
Mike Pall 2011-03-17 16:05:04 +01:00
parent 6299485000
commit ac3b1dcfc5
6 changed files with 3369 additions and 3341 deletions
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2261
src/buildvm_x64.h
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2116
src/buildvm_x64win.h
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8
src/buildvm_x86.dasc
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@ -530,6 +530,14 @@ static void build_subroutines(BuildCtx *ctx, int cmov, int sse)
| mov dword GL:RB->vmstate, ~LJ_VMST_C
| jmp ->vm_leave_unw
|
|->vm_unwind_rethrow:
|.if X64 and not X64WIN
| mov FCARG1, SAVE_L
| mov FCARG2, eax
| restoreregs
| jmp extern lj_err_throw@8 // (lua_State *L, int errcode)
|.endif
|
|->vm_unwind_ff@4: // Unwind C stack, return from ff pcall.
| // (void *cframe)
|.if X64

2324
src/buildvm_x86.h
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10
src/lj_err.c
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@ -577,6 +577,16 @@ LJ_FUNCA int lj_err_unwind_dwarf(int version, _Unwind_Action actions,
lj_vm_unwind_c_eh));
return _URC_INSTALL_CONTEXT;
}
#if LJ_TARGET_X86ORX64
else if ((actions & _UA_HANDLER_FRAME)) {
/* Workaround for ancient libgcc bug. Still present in RHEL 5.5. :-/
** Real fix: http://gcc.gnu.org/viewcvs/trunk/gcc/unwind-dw2.c?r1=121165&r2=124837&pathrev=153877&diff_format=h
*/
_Unwind_SetGR(ctx, LJ_TARGET_EHRETREG, errcode);
_Unwind_SetIP(ctx, (_Unwind_Ptr)lj_vm_unwind_rethrow);
return _URC_INSTALL_CONTEXT;
}
#endif
#else
/* This is not the proper way to escape from the unwinder. We get away with
** it on x86/PPC because the interpreter restores all callee-saved regs.

3
src/lj_vm.h
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@ -19,6 +19,9 @@ LJ_ASMF_NORET void LJ_FASTCALL lj_vm_unwind_c(void *cframe, int errcode);
LJ_ASMF_NORET void LJ_FASTCALL lj_vm_unwind_ff(void *cframe);
LJ_ASMF void lj_vm_unwind_c_eh(void);
LJ_ASMF void lj_vm_unwind_ff_eh(void);
#if LJ_TARGET_X86ORX64
LJ_ASMF void lj_vm_unwind_rethrow(void);
#endif
/* Miscellaneous functions. */
#if LJ_TARGET_X86ORX64