X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Fx86-arch.c;h=d00f26be7d6d22c359a5cccbf1965033a4ca2c7f;hb=7f1e94ae961a198e00daf281eb1dc858e5b2dcc7;hp=e5990776755eb6d7d1d1eced0a3eadb4f7123272;hpb=5eb97830eca716fef626c6e12429c99c9b97e3c8;p=sbcl.git diff --git a/src/runtime/x86-arch.c b/src/runtime/x86-arch.c index e599077..d00f26b 100644 --- a/src/runtime/x86-arch.c +++ b/src/runtime/x86-arch.c @@ -11,25 +11,43 @@ #include +#include "sbcl.h" #include "runtime.h" #include "globals.h" #include "validate.h" #include "os.h" -#include "sbcl.h" #include "arch.h" #include "lispregs.h" -#include "signal.h" #include "alloc.h" #include "interrupt.h" #include "interr.h" #include "breakpoint.h" +#include "thread.h" +#include "pseudo-atomic.h" -#define BREAKPOINT_INST 0xcc /* INT3 */ +#include "genesis/static-symbols.h" +#include "genesis/symbol.h" -unsigned long fast_random_state = 1; +#define BREAKPOINT_INST 0xcc /* INT3 */ +#define UD2_INST 0x0b0f /* UD2 */ + +#ifndef LISP_FEATURE_UD2_BREAKPOINTS +#define BREAKPOINT_WIDTH 1 +#else +#define BREAKPOINT_WIDTH 2 +#endif void arch_init(void) {} + +#ifndef LISP_FEATURE_WIN32 +os_vm_address_t +arch_get_bad_addr(int sig, siginfo_t *code, os_context_t *context) +{ + return (os_vm_address_t)code->si_addr; +} +#endif + /* * hacking signal contexts @@ -41,7 +59,7 @@ void arch_init(void) int * context_eflags_addr(os_context_t *context) { -#if defined __linux__ +#if defined __linux__ || defined __sun /* KLUDGE: As of kernel 2.2.14 on Red Hat 6.2, there's code in the * file to define symbolic names for offsets into * gregs[], but it's conditional on __USE_GNU and not defined, so @@ -52,6 +70,12 @@ context_eflags_addr(os_context_t *context) return &context->uc_mcontext.mc_eflags; #elif defined __OpenBSD__ return &context->sc_eflags; +#elif defined LISP_FEATURE_DARWIN + return (int *)(&context->uc_mcontext->SS.EFLAGS); +#elif defined __NetBSD__ + return &(context->uc_mcontext.__gregs[_REG_EFL]); +#elif defined LISP_FEATURE_WIN32 + return (int *)&context->win32_context->EFlags; #else #error unsupported OS #endif @@ -67,39 +91,44 @@ void arch_skip_instruction(os_context_t *context) int vlen; int code; - FSHOW((stderr, "[arch_skip_inst at %x]\n", *os_context_pc_addr(context))); /* Get and skip the Lisp interrupt code. */ code = *(char*)(*os_context_pc_addr(context))++; switch (code) - { - case trap_Error: - case trap_Cerror: - /* Lisp error arg vector length */ - vlen = *(char*)(*os_context_pc_addr(context))++; - /* Skip Lisp error arg data bytes. */ - while (vlen-- > 0) { - (char*)(*os_context_pc_addr(context))++; - } - break; - - case trap_Breakpoint: /* not tested */ - case trap_FunctionEndBreakpoint: /* not tested */ - break; - - case trap_PendingInterrupt: - case trap_Halt: - /* only needed to skip the Code */ - break; - - default: - fprintf(stderr,"[arch_skip_inst invalid code %d\n]\n",code); - break; - } + { + case trap_Error: + case trap_Cerror: + /* Lisp error arg vector length */ + vlen = *(char*)(*os_context_pc_addr(context))++; + /* Skip Lisp error arg data bytes. */ + while (vlen-- > 0) { + ++*os_context_pc_addr(context); + } + break; + + case trap_Breakpoint: /* not tested */ + case trap_FunEndBreakpoint: /* not tested */ + break; + +#ifdef LISP_FEATURE_SB_SAFEPOINT + case trap_GlobalSafepoint: + case trap_CspSafepoint: +#endif + case trap_PendingInterrupt: + case trap_Halt: + case trap_SingleStepAround: + case trap_SingleStepBefore: + /* only needed to skip the Code */ + break; + + default: + fprintf(stderr,"[arch_skip_inst invalid code %d\n]\n",code); + break; + } FSHOW((stderr, - "[arch_skip_inst resuming at %x]\n", - *os_context_pc_addr(context))); + "/[arch_skip_inst resuming at %x]\n", + *os_context_pc_addr(context))); } unsigned char * @@ -111,35 +140,52 @@ arch_internal_error_arguments(os_context_t *context) boolean arch_pseudo_atomic_atomic(os_context_t *context) { - return SymbolValue(PSEUDO_ATOMIC_ATOMIC); + return get_pseudo_atomic_atomic(arch_os_get_current_thread()); } void arch_set_pseudo_atomic_interrupted(os_context_t *context) { - SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED, make_fixnum(1)); + struct thread *thread = arch_os_get_current_thread(); + set_pseudo_atomic_interrupted(thread); +} + +void +arch_clear_pseudo_atomic_interrupted(os_context_t *context) +{ + struct thread *thread = arch_os_get_current_thread(); + clear_pseudo_atomic_interrupted(thread); } /* * This stuff seems to get called for TRACE and debug activity. */ -unsigned long +unsigned int arch_install_breakpoint(void *pc) { - unsigned long result = *(unsigned long*)pc; + unsigned int result = *(unsigned int*)pc; - *(char*)pc = BREAKPOINT_INST; /* x86 INT3 */ - *((char*)pc+1) = trap_Breakpoint; /* Lisp trap code */ +#ifndef LISP_FEATURE_UD2_BREAKPOINTS + *(char*)pc = BREAKPOINT_INST; /* x86 INT3 */ + *((char*)pc+1) = trap_Breakpoint; /* Lisp trap code */ +#else + *(char*)pc = UD2_INST & 0xff; + *((char*)pc+1) = UD2_INST >> 8; + *((char*)pc+2) = trap_Breakpoint; +#endif return result; } void -arch_remove_breakpoint(void *pc, unsigned long orig_inst) +arch_remove_breakpoint(void *pc, unsigned int orig_inst) { *((char *)pc) = orig_inst & 0xff; *((char *)pc + 1) = (orig_inst & 0xff00) >> 8; +#if BREAKPOINT_WIDTH > 1 + *((char *)pc + 2) = (orig_inst & 0xff0000) >> 16; +#endif } /* When single stepping, single_stepping holds the original instruction @@ -152,13 +198,12 @@ unsigned int single_step_save3; #endif void -arch_do_displaced_inst(os_context_t *context, unsigned long orig_inst) +arch_do_displaced_inst(os_context_t *context, unsigned int orig_inst) { unsigned int *pc = (unsigned int*)(*os_context_pc_addr(context)); /* Put the original instruction back. */ - *((char *)pc) = orig_inst & 0xff; - *((char *)pc + 1) = (orig_inst & 0xff00) >> 8; + arch_remove_breakpoint(pc, orig_inst); #ifdef CANNOT_GET_TO_SINGLE_STEP_FLAG /* Install helper instructions for the single step: @@ -173,143 +218,164 @@ arch_do_displaced_inst(os_context_t *context, unsigned long orig_inst) *context_eflags_addr(context) |= 0x100; #endif - single_stepping = (unsigned int*)pc; + single_stepping = pc; #ifdef CANNOT_GET_TO_SINGLE_STEP_FLAG - *os_context_pc_addr(context) = (char *)pc - 9; + *os_context_pc_addr(context) = (os_context_register_t)((char *)pc - 9); #endif } void -sigtrap_handler(int signal, siginfo_t *info, void *void_context) +restore_breakpoint_from_single_step(os_context_t * context) { - int code = info->si_code; - os_context_t *context = (os_context_t*)void_context; - unsigned int trap; - - if (single_stepping && (signal==SIGTRAP)) - { - /* fprintf(stderr,"* single step trap %x\n", single_stepping); */ - + /* fprintf(stderr,"* single step trap %x\n", single_stepping); */ #ifdef CANNOT_GET_TO_SINGLE_STEP_FLAG - /* Un-install single step helper instructions. */ - *(single_stepping-3) = single_step_save1; - *(single_stepping-2) = single_step_save2; - *(single_stepping-1) = single_step_save3; + /* 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_addr(context) ^= 0x100; + *context_eflags_addr(context) &= ~0x100; #endif - /* Re-install the breakpoint if possible. */ - if (*os_context_pc_addr(context) == (int)single_stepping + 1) { - fprintf(stderr, "warning: couldn't reinstall breakpoint\n"); - } else { - char *ptr = (char*)single_stepping; - *((char *)single_stepping) = BREAKPOINT_INST; /* x86 INT3 */ - *((char *)single_stepping+1) = trap_Breakpoint; - } - - single_stepping = NULL; - return; + /* Re-install the breakpoint if possible. */ + if (((char *)*os_context_pc_addr(context) > + (char *)single_stepping) && + ((char *)*os_context_pc_addr(context) <= + (char *)single_stepping + BREAKPOINT_WIDTH)) { + fprintf(stderr, "warning: couldn't reinstall breakpoint\n"); + } else { + arch_install_breakpoint(single_stepping); + } + + single_stepping = NULL; + return; +} + +void +arch_handle_breakpoint(os_context_t *context) +{ + *os_context_pc_addr(context) -= BREAKPOINT_WIDTH; + handle_breakpoint(context); +} + +void +arch_handle_fun_end_breakpoint(os_context_t *context) +{ + *os_context_pc_addr(context) -= BREAKPOINT_WIDTH; + *os_context_pc_addr(context) = + (int)handle_fun_end_breakpoint(context); +} + +void +arch_handle_single_step_trap(os_context_t *context, int trap) +{ + arch_skip_instruction(context); + /* On x86 the fdefn / function is always in EAX, so we pass 0 + * as the register_offset. */ + handle_single_step_trap(context, trap, 0); +} + +#ifndef LISP_FEATURE_WIN32 +void +sigtrap_handler(int signal, siginfo_t *info, os_context_t *context) +{ + unsigned int trap; + + if (single_stepping) { + restore_breakpoint_from_single_step(context); + return; } /* This is just for info in case the monitor wants to print an * approximation. */ - current_control_stack_pointer = - (lispobj *)*os_context_sp_addr(context); + access_control_stack_pointer(arch_os_get_current_thread()) = + (lispobj *)*os_context_sp_addr(context); + +#ifdef LISP_FEATURE_SUNOS + /* For some reason the breakpoints that :ENCAPSULATE NIL tracing sets up + * cause a trace trap (i.e. processor single-stepping trap) on the following + * instruction on Solaris 10/x86. -- JES, 2006-04-07 + */ + if (info->si_code == TRAP_TRACE) { + lose("foo"); + return; + } +#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 *)(*os_context_pc_addr(context)); - switch (trap) { - - case trap_PendingInterrupt: - FSHOW((stderr, "\n")); - arch_skip_instruction(context); - interrupt_handle_pending(context); - break; - - case trap_Halt: - /* Note: the old CMU CL code tried to save FPU state - * here, and restore it after we do our thing, but there - * seems to be no point in doing that, since we're just - * going to lose(..) anyway. */ - fake_foreign_function_call(context); - lose("%%PRIMITIVE HALT called; the party is over."); - - case trap_Error: - case trap_Cerror: - FSHOW((stderr, "\n", code)); - interrupt_internal_error(signal, info, context, code==trap_Cerror); - break; - - case trap_Breakpoint: - (char*)(*os_context_pc_addr(context)) -= 1; - handle_breakpoint(signal, info, context); - break; - - case trap_FunctionEndBreakpoint: - (char*)(*os_context_pc_addr(context)) -= 1; - *os_context_pc_addr(context) = - (int)handle_function_end_breakpoint(signal, info, context); - break; - - default: - FSHOW((stderr,"[C--trap default %d %d %x]\n", - signal, code, context)); - interrupt_handle_now(signal, info, context); - break; + handle_trap(context, trap); +} + +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"); } +#endif /* not LISP_FEATURE_WIN32 */ void arch_install_interrupt_handlers() { - interrupt_install_low_level_handler(SIGILL , sigtrap_handler); - interrupt_install_low_level_handler(SIGTRAP, sigtrap_handler); + SHOW("entering arch_install_interrupt_handlers()"); + + /* Note: The old CMU CL code here used sigtrap_handler() to handle + * SIGILL as well as SIGTRAP. I couldn't see any reason to do + * things that way. So, I changed to separate handlers when + * debugging a problem on OpenBSD, where SBCL wasn't catching + * SIGILL properly, but was instead letting the process be + * terminated with an "Illegal instruction" output. If this change + * turns out to break something (maybe breakpoint handling on some + * OS I haven't tested on?) and we have to go back to the old CMU + * CL way, I hope there will at least be a comment to explain + * why.. -- WHN 2001-06-07 */ +#if !defined(LISP_FEATURE_WIN32) && !defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER) + undoably_install_low_level_interrupt_handler(SIGILL , sigill_handler); + undoably_install_low_level_interrupt_handler(SIGTRAP, sigtrap_handler); +#endif + SHOW("returning from arch_install_interrupt_handlers()"); } -/* This is implemented in assembly language and called from C: */ -extern lispobj -call_into_lisp(lispobj fun, lispobj *args, int nargs); - -/* These functions are an interface to the Lisp call-in facility. - * Since this is C we can know nothing about the calling environment. - * The control stack might be the C stack if called from the monitor - * or the Lisp stack if called as a result of an interrupt or maybe - * even a separate stack. The args are most likely on that stack but - * could be in registers depending on what the compiler likes. So we - * copy the args into a portable vector and let the assembly language - * call-in function figure it out. */ -lispobj -funcall0(lispobj function) -{ - lispobj *args = NULL; +#ifdef LISP_FEATURE_LINKAGE_TABLE +/* FIXME: It might be cleaner to generate these from the lisp side of + * things. + */ - return call_into_lisp(function, args, 0); -} -lispobj -funcall1(lispobj function, lispobj arg0) -{ - lispobj args[1]; - args[0] = arg0; - return call_into_lisp(function, args, 1); -} -lispobj -funcall2(lispobj function, lispobj arg0, lispobj arg1) +void +arch_write_linkage_table_jmp(char * reloc, void * fun) { - lispobj args[2]; - args[0] = arg0; - args[1] = arg1; - return call_into_lisp(function, args, 2); + /* Make JMP to function entry. JMP offset is calculated from next + * instruction. + */ + long offset = (char *)fun - (reloc + 5); + int i; + + *reloc++ = 0xe9; /* opcode for JMP rel32 */ + for (i = 0; i < 4; i++) { + *reloc++ = offset & 0xff; + offset >>= 8; + } + + /* write a nop for good measure. */ + *reloc = 0x90; } -lispobj -funcall3(lispobj function, lispobj arg0, lispobj arg1, lispobj arg2) + +void +arch_write_linkage_table_ref(void * reloc, void * data) { - lispobj args[3]; - args[0] = arg0; - args[1] = arg1; - args[2] = arg2; - return call_into_lisp(function, args, 3); + *(unsigned long *)reloc = (unsigned long)data; } + +#endif