void handle_breakpoint(os_context_t *context)
{
lispobj code;
DX_ALLOC_SAP(context_sap, context);
fake_foreign_function_call(context);
#ifndef LISP_FEATURE_SB_SAFEPOINT
unblock_gc_signals(0, 0);
#endif
code = find_code(context);
#ifndef LISP_FEATURE_WIN32
/* Don't disallow recursive breakpoint traps. Otherwise, we can't
* use debugger breakpoints anywhere in here. */
thread_sigmask(SIG_SETMASK, os_context_sigmask_addr(context), 0);
#endif
funcall3(StaticSymbolFunction(HANDLE_BREAKPOINT),
compute_offset(context, code),
code,
context_sap);
undo_fake_foreign_function_call(context);
}
void
sigill_handler(int signal, siginfo_t *siginfo, os_context_t *context) {
/* Triggering SIGTRAP using int3 is unreliable on OS X/x86, so
* we need to use illegal instructions for traps.
*/
#if defined(LISP_FEATURE_UD2_BREAKPOINTS) && !defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
if (*((unsigned short *)*os_context_pc_addr(context)) == UD2_INST) {
*os_context_pc_addr(context) += 2;
return sigtrap_handler(signal, siginfo, context);
}
#endif
fake_foreign_function_call(context);
lose("Unhandled SIGILL");
}
void
handle_single_step_trap (os_context_t *context, int kind, int register_offset)
{
fake_foreign_function_call(context);
#ifndef LISP_FEATURE_WIN32
thread_sigmask(SIG_SETMASK, os_context_sigmask_addr(context), 0);
#endif
funcall2(StaticSymbolFunction(HANDLE_SINGLE_STEP_TRAP),
make_fixnum(kind),
make_fixnum(register_offset));
undo_fake_foreign_function_call(context); /* blocks signals again */
}
void *handle_fun_end_breakpoint(os_context_t *context)
{
lispobj code, lra;
struct code *codeptr;
DX_ALLOC_SAP(context_sap, context);
fake_foreign_function_call(context);
#ifndef LISP_FEATURE_SB_SAFEPOINT
unblock_gc_signals(0, 0);
#endif
code = find_code(context);
codeptr = (struct code *)native_pointer(code);
#ifndef LISP_FEATURE_WIN32
/* Don't disallow recursive breakpoint traps. Otherwise, we can't
* use debugger breakpoints anywhere in here. */
thread_sigmask(SIG_SETMASK, os_context_sigmask_addr(context), 0);
#endif
funcall3(StaticSymbolFunction(HANDLE_BREAKPOINT),
compute_offset(context, code),
code,
context_sap);
lra = codeptr->constants[REAL_LRA_SLOT];
#ifdef LISP_FEATURE_PPC
/* PPC now passes LRA objects in reg_LRA during return. Other
* platforms should as well, but haven't been fixed yet. */
*os_context_register_addr(context, reg_LRA) = lra;
#else
#ifdef reg_CODE
*os_context_register_addr(context, reg_CODE) = lra;
#endif
#endif
undo_fake_foreign_function_call(context);
#ifdef reg_LRA
return (void *)(lra-OTHER_POINTER_LOWTAG+sizeof(lispobj));
#else
return compute_pc(lra, fixnum_value(codeptr->constants[REAL_LRA_SLOT+1]));
#endif
}
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;
}
}
