/*
* The GC needs to be hooked into whatever signal is raised for
* page fault on this OS.
*/
static void
sigsegv_handler(int signal, siginfo_t *info, os_context_t *context)
{
os_vm_address_t addr = arch_get_bad_addr(signal, info, context);
#ifdef LISP_FEATURE_ALPHA
/* Alpha stuff: This is the end of a pseudo-atomic section during
which a signal was received. We must deal with the pending
interrupt (see also interrupt.c, ../code/interrupt.lisp)
(how we got here: when interrupting, we set bit 63 in reg_ALLOC.
At the end of the atomic section we tried to write to reg_ALLOC,
got a SIGSEGV (there's nothing mapped there) so ended up here. */
if (addr != NULL &&
*os_context_register_addr(context, reg_ALLOC) & (1L<<63)) {
*os_context_register_addr(context, reg_ALLOC) -= (1L<<63);
interrupt_handle_pending(context);
return;
}
#endif
#ifdef LISP_FEATURE_GENCGC
if (!gencgc_handle_wp_violation(addr))
#else
if (!cheneygc_handle_wp_violation(context, addr))
#endif
if (!handle_guard_page_triggered(context, addr))
lisp_memory_fault_error(context, addr);
}
static void
sigtrap_handler(int signal, siginfo_t *siginfo, os_context_t *context)
{
unsigned int code = *((unsigned char *)(4+*os_context_pc_addr(context)));
u32 trap_instruction = *((u32 *)*os_context_pc_addr(context));
int condition_bits = (trap_instruction >> 28) & 0x0f;
/* Make sure that we're looking at an SWI instruction or that one
* undefined instruction that the kernel recognizes as an explicit
* trap. */
if ((condition_bits == 15)
|| (((trap_instruction & 0x0f000000) != 0x0f000000)
&& (trap_instruction != 0xe7f001f0))) {
lose("Unrecognized trap instruction %08lx in sigtrap_handler()",
trap_instruction);
}
if (trap_instruction == 0xe7f001f0) {
handle_trap(context, code);
} else {
arch_clear_pseudo_atomic_interrupted(context);
arch_skip_instruction(context);
interrupt_handle_pending(context);
}
}
static void
sigbus_handler(int signal, int code, struct sigcontext *context)
{
context->sc_pc -= 4; /* pc is +4 on bus error!?!!? */
if (arch_get_bad_addr(signal, code, context) &&
context->sc_regs[reg_ALLOC] & 2) {
context->sc_regs[reg_ALLOC] -= 2;
interrupt_handle_pending(context);
} else
interrupt_handle_now(signal, code, context);
}
void
sigtrap_handler(HANDLER_ARGS)
{
unsigned int trap;
os_context_t* os_context = (os_context_t *) context;
#if 0
fprintf(stderr, "x86sigtrap: %8x %x\n",
SC_PC(os_os_context), *(unsigned char *) (SC_PC(os_context) - 1));
fprintf(stderr, "sigtrap(%d %d %x)\n", signal, CODE(code), os_context);
#endif
if (single_stepping && (signal == SIGTRAP)) {
#if 0
fprintf(stderr, "* Single step trap %p\n", single_stepping);
#endif
#ifdef SC_EFLAGS
/* Disable single-stepping */
SC_EFLAGS(os_context) ^= 0x100;
#else
/* Un-install single step helper instructions. */
*(single_stepping - 3) = single_step_save1;
*(single_stepping - 2) = single_step_save2;
*(single_stepping - 1) = single_step_save3;
DPRINTF(0, (stderr, "Uninstalling helper instructions\n"));
#endif
/*
* Re-install the breakpoint if possible.
*/
if ((int) SC_PC(os_context) == (int) single_stepping + 1)
fprintf(stderr, "* Breakpoint not re-install\n");
else {
char *ptr = (char *) single_stepping;
ptr[0] = BREAKPOINT_INST; /* x86 INT3 */
ptr[1] = trap_Breakpoint;
}
single_stepping = NULL;
return;
}
/* This is just for info in case monitor wants to print an approx */
current_control_stack_pointer = (unsigned long *) SC_SP(os_context);
RESTORE_FPU(os_context);
/*
* On entry %eip points just after the INT3 byte and aims at the
* 'kind' value (eg trap_Cerror). For error-trap and Cerror-trap a
* number of bytes will follow, the first is the length of the byte
* arguments to follow.
*/
trap = *(unsigned char *) SC_PC(os_context);
switch (trap) {
case trap_PendingInterrupt:
DPRINTF(0, (stderr, "<trap Pending Interrupt.>\n"));
arch_skip_instruction(os_context);
interrupt_handle_pending(os_context);
break;
case trap_Halt:
{
FPU_STATE(fpu_state);
save_fpu_state(fpu_state);
fake_foreign_function_call(os_context);
lose("%%primitive halt called; the party is over.\n");
undo_fake_foreign_function_call(os_context);
restore_fpu_state(fpu_state);
arch_skip_instruction(os_context);
break;
}
case trap_Error:
case trap_Cerror:
DPRINTF(0, (stderr, "<trap Error %x>\n", CODE(code)));
interrupt_internal_error(signal, code, os_context, CODE(code) == trap_Cerror);
break;
case trap_Breakpoint:
#if 0
fprintf(stderr, "*C break\n");
#endif
SC_PC(os_context) -= 1;
handle_breakpoint(signal, CODE(code), os_context);
#if 0
fprintf(stderr, "*C break return\n");
#endif
break;
case trap_FunctionEndBreakpoint:
SC_PC(os_context) -= 1;
SC_PC(os_context) =
(int) handle_function_end_breakpoint(signal, CODE(code), os_context);
break;
#ifdef trap_DynamicSpaceOverflowWarning
case trap_DynamicSpaceOverflowWarning:
interrupt_handle_space_overflow(SymbolFunction
(DYNAMIC_SPACE_OVERFLOW_WARNING_HIT),
os_context);
break;
#endif
#ifdef trap_DynamicSpaceOverflowError
case trap_DynamicSpaceOverflowError:
interrupt_handle_space_overflow(SymbolFunction
(DYNAMIC_SPACE_OVERFLOW_ERROR_HIT),
os_context);
break;
#endif
default:
DPRINTF(0,
(stderr, "[C--trap default %d %d %p]\n", signal, CODE(code),
os_context));
interrupt_handle_now(signal, code, os_context);
break;
}
}
void
sigtrap_handler(HANDLER_ARGS)
{
unsigned int trap;
#ifdef __linux__
GET_CONTEXT
#endif
#if 0
fprintf(stderr, "x86sigtrap: %8x %x\n",
context->sc_pc, *(unsigned char *) (context->sc_pc - 1));
fprintf(stderr, "sigtrap(%d %d %x)\n", signal, code, context);
#endif
if (single_stepping && (signal == SIGTRAP)) {
#if 0
fprintf(stderr, "* Single step trap %x\n", single_stepping);
#endif
#ifndef __linux__
/* Un-install single step helper instructions. */
*(single_stepping - 3) = single_step_save1;
*(single_stepping - 2) = single_step_save2;
*(single_stepping - 1) = single_step_save3;
#else
context->eflags ^= 0x100;
#endif
/*
* Re-install the breakpoint if possible.
*/
if ((int) context->sc_pc == (int) single_stepping + 1)
fprintf(stderr, "* Breakpoint not re-install\n");
else {
char *ptr = (char *) single_stepping;
ptr[0] = BREAKPOINT_INST; /* x86 INT3 */
ptr[1] = trap_Breakpoint;
}
single_stepping = NULL;
return;
}
/* This is just for info in case monitor wants to print an approx */
current_control_stack_pointer = (unsigned long *) context->sc_sp;
#if defined(__linux__) && (defined(i386) || defined(__x86_64))
/*
* Restore the FPU control word, setting the rounding mode to nearest.
*/
if (contextstruct.fpstate)
#if defined(__x86_64)
setfpucw(contextstruct.fpstate->cwd & ~0xc00);
#else
setfpucw(contextstruct.fpstate->cw & ~0xc00);
#endif
#endif
/*
* On entry %eip points just after the INT3 byte and aims at the
* 'kind' value (eg trap_Cerror). For error-trap and Cerror-trap a
* number of bytes will follow, the first is the length of the byte
* arguments to follow.
*/
trap = *(unsigned char *) (context->sc_pc);
switch (trap) {
case trap_PendingInterrupt:
DPRINTF(0, (stderr, "<trap Pending Interrupt.>\n"));
arch_skip_instruction(context);
interrupt_handle_pending(context);
break;
case trap_Halt:
{
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
int fpu_state[27];
fpu_save(fpu_state);
#endif
fake_foreign_function_call(context);
lose("%%primitive halt called; the party is over.\n");
undo_fake_foreign_function_call(context);
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
fpu_restore(fpu_state);
#endif
arch_skip_instruction(context);
break;
}
case trap_Error:
case trap_Cerror:
DPRINTF(0, (stderr, "<trap Error %d>\n", code));
#ifdef __linux__
interrupt_internal_error(signal, contextstruct, code == trap_Cerror);
#else
interrupt_internal_error(signal, code, context, code == trap_Cerror);
#endif
break;
case trap_Breakpoint:
#if 0
fprintf(stderr, "*C break\n");
#endif
(char *) context->sc_pc -= 1;
handle_breakpoint(signal, code, context);
#if 0
fprintf(stderr, "*C break return\n");
#endif
break;
case trap_FunctionEndBreakpoint:
(char *) context->sc_pc -= 1;
context->sc_pc =
(int) handle_function_end_breakpoint(signal, code, context);
break;
#ifdef DYNAMIC_SPACE_OVERFLOW_WARNING_HIT
case trap_DynamicSpaceOverflowWarning:
interrupt_handle_space_overflow(SymbolFunction
(DYNAMIC_SPACE_OVERFLOW_WARNING_HIT),
context);
break;
#endif
#ifdef DYNAMIC_SPACE_OVERFLOW_ERROR_HIT
case trap_DynamicSpaceOverflowError:
interrupt_handle_space_overflow(SymbolFunction
(DYNAMIC_SPACE_OVERFLOW_ERROR_HIT),
context);
break;
#endif
default:
DPRINTF(0,
(stderr, "[C--trap default %d %d %x]\n", signal, code,
context));
#ifdef __linux__
interrupt_handle_now(signal, contextstruct);
#else
interrupt_handle_now(signal, code, context);
#endif
break;
}
}
