/* DWARF2 personality handler referenced from interpreter .eh_frame. */
LJ_FUNCA int lj_err_unwind_dwarf(int version, _Unwind_Action actions,
uint64_t uexclass, struct _Unwind_Exception *uex,
struct _Unwind_Context *ctx)
{
void *cf;
lua_State *L;
if (version != 1)
return _URC_FATAL_PHASE1_ERROR;
UNUSED(uexclass);
cf = (void *)_Unwind_GetCFA(ctx);
L = cframe_L(cf);
if ((actions & _UA_SEARCH_PHASE)) {
#if LJ_UNWIND_EXT
if (err_unwind(L, cf, 0) == NULL)
return _URC_CONTINUE_UNWIND;
#endif
if (!LJ_UEXCLASS_CHECK(uexclass)) {
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_ERRCPP));
}
return _URC_HANDLER_FOUND;
}
if ((actions & _UA_CLEANUP_PHASE)) {
int errcode;
if (LJ_UEXCLASS_CHECK(uexclass)) {
errcode = LJ_UEXCLASS_ERRCODE(uexclass);
} else {
if ((actions & _UA_HANDLER_FRAME))
_Unwind_DeleteException(uex);
errcode = LUA_ERRRUN;
}
#if LJ_UNWIND_EXT
cf = err_unwind(L, cf, errcode);
if ((actions & _UA_FORCE_UNWIND)) {
return _URC_CONTINUE_UNWIND;
} else if (cf) {
_Unwind_SetGR(ctx, LJ_TARGET_EHRETREG, errcode);
_Unwind_SetIP(ctx, (uintptr_t)(cframe_unwind_ff(cf) ?
lj_vm_unwind_ff_eh :
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, (uintptr_t)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.
*/
lj_err_throw(L, errcode);
#endif
}
return _URC_CONTINUE_UNWIND;
}
/* ARM unwinder personality handler referenced from interpreter .ARM.extab. */
LJ_FUNCA int lj_err_unwind_arm(int state, _Unwind_Control_Block *ucb,
_Unwind_Context *ctx)
{
void *cf = (void *)_Unwind_GetGR(ctx, 13);
lua_State *L = cframe_L(cf);
int errcode;
switch ((state & _US_ACTION_MASK)) {
case _US_VIRTUAL_UNWIND_FRAME:
if ((state & _US_FORCE_UNWIND)) break;
return _URC_HANDLER_FOUND;
case _US_UNWIND_FRAME_STARTING:
if (LJ_UEXCLASS_CHECK(ucb->exclass)) {
errcode = LJ_UEXCLASS_ERRCODE(ucb->exclass);
} else {
errcode = LUA_ERRRUN;
setstrV(L, L->top++, lj_err_str(L, LJ_ERR_ERRCPP));
}
cf = err_unwind(L, cf, errcode);
if ((state & _US_FORCE_UNWIND) || cf == NULL) break;
_Unwind_SetGR(ctx, 15, (uint32_t)lj_vm_unwind_ext);
_Unwind_SetGR(ctx, 0, (uint32_t)ucb);
_Unwind_SetGR(ctx, 1, (uint32_t)errcode);
_Unwind_SetGR(ctx, 2, cframe_unwind_ff(cf) ?
(uint32_t)lj_vm_unwind_ff_eh :
(uint32_t)lj_vm_unwind_c_eh);
return _URC_INSTALL_CONTEXT;
default:
return _URC_FAILURE;
}
if (__gnu_unwind_frame(ucb, ctx) != _URC_OK)
return _URC_FAILURE;
return _URC_CONTINUE_UNWIND;
}
