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
}
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_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 */
}
