void
mono_monoctx_to_sigctx (MonoContext *mctx, void *sigctx)
{
os_ucontext *uc = sigctx;
UCONTEXT_REG_NIP(uc) = mctx->sc_ir;
UCONTEXT_REG_Rn(uc, 1) = mctx->sc_sp;
memcpy (&UCONTEXT_REG_Rn(uc, 13), &mctx->regs, sizeof (mgreg_t) * MONO_SAVED_GREGS);
memcpy (&UCONTEXT_REG_FPRn(uc, 14), &mctx->fregs, sizeof (double) * MONO_SAVED_FREGS);
}
void
mono_sigctx_to_monoctx (void *sigctx, MonoContext *mctx)
{
os_ucontext *uc = sigctx;
mctx->sc_ir = UCONTEXT_REG_NIP(uc);
mctx->sc_sp = UCONTEXT_REG_Rn(uc, 1);
memcpy (&mctx->regs, &UCONTEXT_REG_Rn(uc, 0), sizeof (mgreg_t) * MONO_MAX_IREGS);
memcpy (&mctx->fregs, &UCONTEXT_REG_FPRn(uc, 0), sizeof (double) * MONO_MAX_FREGS);
}
void
mono_monoctx_to_sigctx (MonoContext *mctx, void *sigctx)
{
os_ucontext *uc = sigctx;
memcpy (&UCONTEXT_REG_Rn(uc, 0), &mctx->regs, sizeof (mgreg_t) * MONO_MAX_IREGS);
memcpy (&UCONTEXT_REG_FPRn(uc, 0), &mctx->fregs, sizeof (double) * MONO_MAX_FREGS);
/* The valid values for pc and sp are stored here and not in regs array */
UCONTEXT_REG_NIP(uc) = mctx->sc_ir;
UCONTEXT_REG_Rn(uc, 1) = mctx->sc_sp;
}
void
mono_arch_monoctx_to_sigctx (MonoContext *mctx, void *ctx)
{
#ifdef MONO_CROSS_COMPILE
g_assert_not_reached ();
#else
os_ucontext *uc = ctx;
UCONTEXT_REG_NIP(uc) = mctx->sc_ir;
UCONTEXT_REG_Rn(uc, 1) = mctx->sc_sp;
memcpy (&UCONTEXT_REG_Rn(uc, 13), &mctx->regs, sizeof (mgreg_t) * MONO_SAVED_GREGS);
memcpy (&UCONTEXT_REG_FPRn(uc, 14), &mctx->fregs, sizeof (double) * MONO_SAVED_FREGS);
#endif
}
gboolean
mono_arch_handle_exception (void *ctx, gpointer obj)
{
#if defined(MONO_ARCH_USE_SIGACTION) && defined(UCONTEXT_REG_Rn)
/*
* Handling the exception in the signal handler is problematic, since the original
* signal is disabled, and we could run arbitrary code though the debugger. So
* resume into the normal stack and do most work there if possible.
*/
MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
mgreg_t sp;
void *sigctx = ctx;
int frame_size;
void *uc = sigctx;
/* Pass the ctx parameter in TLS */
mono_sigctx_to_monoctx (sigctx, &jit_tls->ex_ctx);
/* The others in registers */
UCONTEXT_REG_Rn (sigctx, PPC_FIRST_ARG_REG) = (gsize)obj;
/* Allocate a stack frame below the red zone */
/* Similar to mono_arch_handle_altstack_exception () */
frame_size = 224;
frame_size += 15;
frame_size &= ~15;
sp = (mgreg_t)(UCONTEXT_REG_Rn(uc, 1) & ~15);
sp = (mgreg_t)(sp - frame_size);
UCONTEXT_REG_Rn(uc, 1) = (mgreg_t)sp;
setup_ucontext_return (uc, handle_signal_exception);
return TRUE;
#else
MonoContext mctx;
gboolean result;
mono_sigctx_to_monoctx (ctx, &mctx);
result = mono_handle_exception (&mctx, obj);
/* restore the context so that returning from the signal handler will invoke
* the catch clause
*/
mono_monoctx_to_sigctx (&mctx, ctx);
return result;
#endif
}
static void
setup_ucontext_return (void *uc, gpointer func)
{
#if !defined(MONO_CROSS_COMPILE)
UCONTEXT_REG_LNK(uc) = UCONTEXT_REG_NIP(uc);
#ifdef PPC_USES_FUNCTION_DESCRIPTOR
{
MonoPPCFunctionDescriptor *handler_ftnptr = (MonoPPCFunctionDescriptor*)func;
UCONTEXT_REG_NIP(uc) = (gulong)handler_ftnptr->code;
UCONTEXT_REG_Rn(uc, 2) = (gulong)handler_ftnptr->toc;
}
#else
UCONTEXT_REG_NIP(uc) = (unsigned long)func;
#if _CALL_ELF == 2
/* ELF v2 ABI calling convention requires to put the target address into
* r12 if we use the global entry point of a function. */
UCONTEXT_REG_Rn(uc, 12) = (unsigned long) func;
#endif
#endif
#endif
}
void
mono_ppc_set_func_into_sigctx (void *sigctx, void *func)
{
#ifdef MONO_CROSS_COMPILE
g_assert_not_reached ();
#elif defined(PPC_USES_FUNCTION_DESCRIPTOR)
/* Have to set both the ip and the TOC reg */
os_ucontext *uc = sigctx;
UCONTEXT_REG_NIP(uc) = ((gsize*)func) [0];
UCONTEXT_REG_Rn (uc, 2) = ((gsize*)func)[1];
#else
g_assert_not_reached ();
#endif
}
static void
setup_ucontext_return (void *uc, gpointer func)
{
#if !defined(MONO_CROSS_COMPILE)
UCONTEXT_REG_LNK(uc) = UCONTEXT_REG_NIP(uc);
#ifdef PPC_USES_FUNCTION_DESCRIPTOR
{
MonoPPCFunctionDescriptor *handler_ftnptr = (MonoPPCFunctionDescriptor*)func;
UCONTEXT_REG_NIP(uc) = (gulong)handler_ftnptr->code;
UCONTEXT_REG_Rn(uc, 2) = (gulong)handler_ftnptr->toc;
}
#else
UCONTEXT_REG_NIP(uc) = (unsigned long)func;
#endif
#endif
}
void
mono_arch_handle_altstack_exception (void *sigctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, gpointer fault_addr, gboolean stack_ovf)
{
#ifdef MONO_CROSS_COMPILE
g_assert_not_reached ();
#else
#ifdef MONO_ARCH_USE_SIGACTION
os_ucontext *uc = (ucontext_t*)sigctx;
os_ucontext *uc_copy;
MonoJitInfo *ji = mini_jit_info_table_find (mono_domain_get (), mono_arch_ip_from_context (sigctx), NULL);
gpointer *sp;
int frame_size;
if (stack_ovf) {
const char *method;
/* we don't do much now, but we can warn the user with a useful message */
fprintf (stderr, "Stack overflow: IP: %p, SP: %p\n", mono_arch_ip_from_context (sigctx), (gpointer)UCONTEXT_REG_Rn(uc, 1));
if (ji && !ji->is_trampoline && jinfo_get_method (ji))
method = mono_method_full_name (jinfo_get_method (ji), TRUE);
else
method = "Unmanaged";
fprintf (stderr, "At %s\n", method);
abort ();
}
if (!ji)
mono_handle_native_crash ("SIGSEGV", sigctx, siginfo);
/* setup a call frame on the real stack so that control is returned there
* and exception handling can continue.
* The frame looks like:
* ucontext struct
* ...
* 224 is the size of the red zone
*/
frame_size = sizeof (ucontext_t) + sizeof (gpointer) * 16 + 224;
frame_size += 15;
frame_size &= ~15;
sp = (gpointer)(UCONTEXT_REG_Rn(uc, 1) & ~15);
sp = (gpointer)((char*)sp - frame_size);
/* may need to adjust pointers in the new struct copy, depending on the OS */
uc_copy = (ucontext_t*)(sp + 16);
memcpy (uc_copy, uc, sizeof (os_ucontext));
#if defined(__linux__) && !defined(__mono_ppc64__)
uc_copy->uc_mcontext.uc_regs = (gpointer)((char*)uc_copy + ((char*)uc->uc_mcontext.uc_regs - (char*)uc));
#endif
g_assert (mono_arch_ip_from_context (uc) == mono_arch_ip_from_context (uc_copy));
/* at the return form the signal handler execution starts in altstack_handle_and_restore() */
UCONTEXT_REG_LNK(uc) = UCONTEXT_REG_NIP(uc);
#ifdef PPC_USES_FUNCTION_DESCRIPTOR
{
MonoPPCFunctionDescriptor *handler_ftnptr = (MonoPPCFunctionDescriptor*)altstack_handle_and_restore;
UCONTEXT_REG_NIP(uc) = (gulong)handler_ftnptr->code;
UCONTEXT_REG_Rn(uc, 2) = (gulong)handler_ftnptr->toc;
}
#else
UCONTEXT_REG_NIP(uc) = (unsigned long)altstack_handle_and_restore;
#if _CALL_ELF == 2
/* ELF v2 ABI calling convention requires to put the target address into
* r12 if we use the global entry point of a function. */
UCONTEXT_REG_Rn(uc, 12) = (unsigned long) altstack_handle_and_restore;
#endif
#endif
UCONTEXT_REG_Rn(uc, 1) = (unsigned long)sp;
UCONTEXT_REG_Rn(uc, PPC_FIRST_ARG_REG) = (unsigned long)(sp + 16);
UCONTEXT_REG_Rn(uc, PPC_FIRST_ARG_REG + 1) = 0;
UCONTEXT_REG_Rn(uc, PPC_FIRST_ARG_REG + 2) = 0;
#endif
#endif /* !MONO_CROSS_COMPILE */
}
