#include <stdio.h>
#include <string.h>
-#include <asm/pal.h> /* for PAL_gentrap */
-#include "runtime.h"
#include "sbcl.h"
+#include "runtime.h"
#include "globals.h"
#include "validate.h"
#include "os.h"
#include "interrupt.h"
#include "interr.h"
#include "breakpoint.h"
+#include "monitor.h"
extern char call_into_lisp_LRA[], call_into_lisp_end[];
+
extern size_t os_vm_page_size;
#define BREAKPOINT_INST 0x80
-void arch_init(void)
+
+void
+arch_init(void)
{
- /* this must be called _after_ os_init, so we know what the page size is */
- if(mmap((os_vm_address_t) call_into_lisp_LRA_page,os_vm_page_size,
- OS_VM_PROT_ALL,MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED,-1,0)
- == (os_vm_address_t) -1)
- perror("mmap");
-
+ /* This must be called _after_ os_init(), so that we know what the
+ * page size is. */
+
+ if (mmap((os_vm_address_t) call_into_lisp_LRA_page,os_vm_page_size,
+ OS_VM_PROT_ALL,MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED,-1,0)
+ == (os_vm_address_t) -1)
+ perror("mmap");
+
/* call_into_lisp_LRA is a collection of trampolines written in asm -
* see alpha-assem.S. We copy it to call_into_lisp_LRA_page where
- * VOPs and things can find it (I don't know why they can't find it
- * where it was to start with). */
+ * VOPs and things can find it. (I don't know why they can't find it
+ * where it was to start with.) */
bcopy(call_into_lisp_LRA,(void *)call_into_lisp_LRA_page,os_vm_page_size);
os_flush_icache((os_vm_address_t)call_into_lisp_LRA_page,
- os_vm_page_size);
+ os_vm_page_size);
return;
}
-os_vm_address_t
+os_vm_address_t
arch_get_bad_addr (int sig, siginfo_t *code, os_context_t *context)
{
- unsigned int badinst;
-
- /* instructions are 32 bit quantities */
- unsigned int *pc ;
- /* fprintf(stderr,"arch_get_bad_addr %d %p %p\n",
- sig, code, context); */
- pc= (unsigned int *)(*os_context_pc_addr(context));
-
- if(((unsigned long)pc) & 3)
- return NULL; /* in what case would pc be unaligned? */
-
- if( (pc < READ_ONLY_SPACE_START ||
- pc >= READ_ONLY_SPACE_START+READ_ONLY_SPACE_SIZE) &&
- (pc < current_dynamic_space ||
- pc >= current_dynamic_space + DYNAMIC_SPACE_SIZE))
- return NULL;
-
- badinst = *pc;
-
- if(((badinst>>27)!=0x16) /* STL or STQ */
- && ((badinst>>27)!=0x13)) /* STS or STT */
- return NULL; /* Otherwise forget about address */
-
- return (os_vm_address_t)
- (*os_context_register_addr(context,((badinst>>16)&0x1f))
- +(badinst&0xffff));
+ unsigned int badinst;
+
+ /* Instructions are 32 bit quantities. */
+ unsigned int *pc ;
+ /* fprintf(stderr,"arch_get_bad_addr %d %p %p\n",
+ sig, code, context); */
+ pc= (unsigned int *)(*os_context_pc_addr(context));
+
+ if (((unsigned long)pc) & 3) {
+ return NULL; /* In what case would pc be unaligned?? */
+ }
+
+ if ( (pc < READ_ONLY_SPACE_START ||
+ pc >= READ_ONLY_SPACE_START+READ_ONLY_SPACE_SIZE) &&
+ (pc < current_dynamic_space ||
+ pc >= current_dynamic_space + DYNAMIC_SPACE_SIZE))
+ return NULL;
+
+ return context->uc_mcontext.sc_traparg_a0;
}
-void arch_skip_instruction(os_context_t *context)
+void
+arch_skip_instruction(os_context_t *context)
{
- /* this may be complete rubbish, as (at least for traps) pc points
- * _after_ the instruction that caused us to be here anyway
+ /* This may be complete rubbish, as (at least for traps) pc points
+ * _after_ the instruction that caused us to be here anyway.
*/
((char*)*os_context_pc_addr(context)) +=4; }
-unsigned char *arch_internal_error_arguments(os_context_t *context)
+unsigned char *
+arch_internal_error_arguments(os_context_t *context)
{
- return (unsigned char *)(*os_context_pc_addr(context)+4);
+ return (unsigned char *)(*os_context_pc_addr(context)+4);
}
-boolean arch_pseudo_atomic_atomic(os_context_t *context)
+boolean
+arch_pseudo_atomic_atomic(os_context_t *context)
{
- return ((*os_context_register_addr(context,reg_ALLOC)) & 1);
+ return ((*os_context_register_addr(context,reg_ALLOC)) & 1);
}
void arch_set_pseudo_atomic_interrupted(os_context_t *context)
{
/* On coming out of an atomic section, we subtract 1 from
- * reg_Alloc, then try to store something at that address. On
- * OSF/1 we add 1 to reg_Alloc here so that the end-of-atomic code
- * will raise SIGTRAP for "unaligned access". Linux catches
- * unaligned accesses in the kernel and fixes them up[1], so there
- * we toggle bit 63 instead. The resulting address is somewhere
- * out in no-man's land, so we get SIGSEGV when we try to access
- * it. We catch whichever signal it is (see the appropriate
- * *-os.c) and call interrupt_handle_pending() from it */
-
- /* [1] This behaviour can be changed with osf_setsysinfo, but cmucl
- * didn't use that */
-
-#ifdef __linux__
- *os_context_register_addr(context,reg_ALLOC) |= (1L<<63);
-#else
- *os_context_register_addr(context,reg_ALLOC) |= 2;
-#endif
+ * reg_Alloc, then try to store something at that address. So,
+ * to signal that it was interrupted and a signal should be handled,
+ * we set bit 63 of reg_ALLOC here so that the end-of-atomic code
+ * will raise SIGSEGV (no ram mapped there). We catch the signal
+ * (see the appropriate *-os.c) and call interrupt_handle_pending()
+ * for the saved signal instead */
+
+ *os_context_register_addr(context,reg_ALLOC) |= (1L<<63);
}
-/* XXX but is the caller of this storing all 64 bits? */
unsigned long arch_install_breakpoint(void *pc)
{
unsigned int *ptr = (unsigned int *)pc;
unsigned long result = (unsigned long) *ptr;
*ptr = BREAKPOINT_INST;
- *(ptr+1)=trap_Breakpoint;
-
+
os_flush_icache((os_vm_address_t)ptr, sizeof(unsigned long));
-
+
return result;
}
void arch_remove_breakpoint(void *pc, unsigned long orig_inst)
{
- /* was (unsigned int) but gcc complains. Changed to mirror
- install_breakpoint above */
- unsigned long *ptr=(unsigned long *)pc;
- *ptr = orig_inst;
- os_flush_icache((os_vm_address_t)pc, sizeof(unsigned long));
+ /* was (unsigned int) but gcc complains. Changed to mirror
+ * install_breakpoint() above */
+ unsigned long *ptr=(unsigned long *)pc;
+ *ptr = orig_inst;
+ os_flush_icache((os_vm_address_t)pc, sizeof(unsigned long));
}
static unsigned int *skipped_break_addr, displaced_after_inst,
after_breakpoint;
-/* Returns a PC value. Lisp code is all in the 32-bit-addressable
- space,so we should be ok with an unsigned int */
-
+/* This returns a PC value. Lisp code is all in the 32-bit-addressable
+ * space, so we should be ok with an unsigned int. */
unsigned int
emulate_branch(os_context_t *context,unsigned long orig_inst)
{
- int op = orig_inst >> 26;
- int reg_a = (orig_inst >> 21) & 0x1f;
- int reg_b = (orig_inst >> 16) & 0x1f;
- int fn = orig_inst & 0xffff;
- int disp = (orig_inst&(1<<20)) ? orig_inst | (-1 << 21) : orig_inst&0x1fffff;
- int next_pc = *os_context_pc_addr(context);
- int branch = 0; /* was NULL; */
-
- switch(op) {
- case 0x1a: /* jmp, jsr, jsr_coroutine, ret */
- *os_context_register_addr(context,reg_a)=*os_context_pc_addr(context);
- *os_context_pc_addr(context)=*os_context_register_addr(context,reg_b)& ~3;
- break;
- case 0x30: /* br */
- *os_context_register_addr(context,reg_a)=*os_context_pc_addr(context);
- branch = 1;
- break;
- case 0x31: /* fbeq */
- if(*(os_context_fpregister_addr(context,reg_a))==0) branch = 1;
- break;
- case 0x32: /* fblt */
- if(*os_context_fpregister_addr(context,reg_a)<0) branch = 1;
- break;
- case 0x33: /* fble */
- if(*os_context_fpregister_addr(context,reg_a)<=0) branch = 1;
- break;
- case 0x34: /* bsr */
- *os_context_register_addr(context,reg_a)=*os_context_pc_addr(context);
- branch = 1;
- break;
- case 0x35: /* fbne */
- if(*os_context_register_addr(context,reg_a)!=0) branch = 1;
- break;
- case 0x36: /* fbge */
- if(*os_context_fpregister_addr(context,reg_a)>=0) branch = 1;
- break;
- case 0x37: /* fbgt */
- if(*os_context_fpregister_addr(context,reg_a)>0) branch = 1;
- break;
- case 0x38: /* blbc */
- if((*os_context_register_addr(context,reg_a)&1) == 0) branch = 1;
- break;
- case 0x39: /* beq */
- if(*os_context_register_addr(context,reg_a)==0) branch = 1;
- break;
- case 0x3a: /* blt */
- if(*os_context_register_addr(context,reg_a)<0) branch = 1;
- break;
- case 0x3b: /* ble */
- if(*os_context_register_addr(context,reg_a)<=0) branch = 1;
- break;
- case 0x3c: /* blbs */
- if((*os_context_register_addr(context,reg_a)&1)!=0) branch = 1;
- break;
- case 0x3d: /* bne */
- if(*os_context_register_addr(context,reg_a)!=0) branch = 1;
- break;
- case 0x3e: /* bge */
- if(*os_context_register_addr(context,reg_a)>=0) branch = 1;
- break;
- case 0x3f: /* bgt */
- if(*os_context_register_addr(context,reg_a)>0) branch = 1;
- break;
- }
- if(branch) next_pc += disp*4;
- return next_pc;
+ int op = orig_inst >> 26;
+ int reg_a = (orig_inst >> 21) & 0x1f;
+ int reg_b = (orig_inst >> 16) & 0x1f;
+ int disp =
+ (orig_inst&(1<<20)) ?
+ orig_inst | (-1 << 21) :
+ orig_inst&0x1fffff;
+ int next_pc = *os_context_pc_addr(context);
+ int branch = 0; /* was NULL; */
+
+ switch(op) {
+ case 0x1a: /* jmp, jsr, jsr_coroutine, ret */
+ *os_context_register_addr(context,reg_a) =
+ *os_context_pc_addr(context);
+ *os_context_pc_addr(context) =
+ *os_context_register_addr(context,reg_b)& ~3;
+ break;
+ case 0x30: /* br */
+ *os_context_register_addr(context,reg_a)=*os_context_pc_addr(context);
+ branch = 1;
+ break;
+ case 0x31: /* fbeq */
+ if (*(os_context_float_register_addr(context,reg_a))==0) branch = 1;
+ break;
+ case 0x32: /* fblt */
+ if (*os_context_float_register_addr(context,reg_a)<0) branch = 1;
+ break;
+ case 0x33: /* fble */
+ if (*os_context_float_register_addr(context,reg_a)<=0) branch = 1;
+ break;
+ case 0x34: /* bsr */
+ *os_context_register_addr(context,reg_a)=*os_context_pc_addr(context);
+ branch = 1;
+ break;
+ case 0x35: /* fbne */
+ if (*os_context_register_addr(context,reg_a)!=0) branch = 1;
+ break;
+ case 0x36: /* fbge */
+ if (*os_context_float_register_addr(context,reg_a)>=0) branch = 1;
+ break;
+ case 0x37: /* fbgt */
+ if (*os_context_float_register_addr(context,reg_a)>0) branch = 1;
+ break;
+ case 0x38: /* blbc */
+ if ((*os_context_register_addr(context,reg_a)&1) == 0) branch = 1;
+ break;
+ case 0x39: /* beq */
+ if (*os_context_register_addr(context,reg_a)==0) branch = 1;
+ break;
+ case 0x3a: /* blt */
+ if (*os_context_register_addr(context,reg_a)<0) branch = 1;
+ break;
+ case 0x3b: /* ble */
+ if (*os_context_register_addr(context,reg_a)<=0) branch = 1;
+ break;
+ case 0x3c: /* blbs */
+ if ((*os_context_register_addr(context,reg_a)&1)!=0) branch = 1;
+ break;
+ case 0x3d: /* bne */
+ if (*os_context_register_addr(context,reg_a)!=0) branch = 1;
+ break;
+ case 0x3e: /* bge */
+ if (*os_context_register_addr(context,reg_a)>=0) branch = 1;
+ break;
+ case 0x3f: /* bgt */
+ if (*os_context_register_addr(context,reg_a)>0) branch = 1;
+ break;
+ }
+ if (branch)
+ next_pc += disp*4;
+ return next_pc;
}
static sigset_t orig_sigmask;
+/* Perform the instruction that we overwrote with a breakpoint. As we
+ * don't have a single-step facility, this means we have to:
+ * - put the instruction back
+ * - put a second breakpoint at the following instruction,
+ * set after_breakpoint and continue execution.
+ *
+ * When the second breakpoint is hit (very shortly thereafter, we hope)
+ * sigtrap_handler gets called again, but follows the AfterBreakpoint
+ * arm, which
+ * - puts a bpt back in the first breakpoint place (running across a
+ * breakpoint shouldn't cause it to be uninstalled)
+ * - replaces the second bpt with the instruction it was meant to be
+ * - carries on
+ *
+ * Clear?
+ */
+
void arch_do_displaced_inst(os_context_t *context,unsigned int orig_inst)
{
- unsigned int *pc=(unsigned int *)(*os_context_pc_addr(context));
- unsigned int *next_pc;
- unsigned int next_inst;
- int op = orig_inst >> 26;;
- fprintf(stderr,"arch_do_displaced_inst depends on sigreturn, which is not implemented and will\nalways fail\n");
- orig_sigmask = *os_context_sigmask_addr(context);
- sigaddset_blockable(os_context_sigmask_addr(context));
-
- /* Figure out where the displaced inst is going */
- if(op == 0x1a || (op&0xf) == 0x30) /* branch...ugh */
- /* the cast to long is just to shut gcc up */
- next_pc = (unsigned int *)((long)emulate_branch(context,orig_inst));
- else
- next_pc = pc+1;
-
- /* Put the original instruction back. */
- *pc = orig_inst;
- os_flush_icache((os_vm_address_t)pc, sizeof(unsigned long));
- skipped_break_addr = pc;
-
- /* set the after breakpoint */
- displaced_after_inst = *next_pc;
- *next_pc = BREAKPOINT_INST;
- after_breakpoint=1;
- os_flush_icache((os_vm_address_t)next_pc, sizeof(unsigned long));
-
- ldb_monitor("sigreturn is not implemented and just failed");
- sigreturn(context);
+ /* Apparent off-by-one errors ahoy. If you consult the Alpha ARM,
+ * it will tell you that after a BPT, the saved PC is the address
+ * of the instruction _after_ the instruction that caused the trap.
+ *
+ * However, we decremented PC by 4 before calling the Lisp-level
+ * handler that calls this routine (see alpha-arch.c line 322 and
+ * friends) so when we get to this point PC is actually pointing
+ * at the BPT instruction itself. This is good, because this is
+ * where we want to restart execution when we do that */
+
+ unsigned int *pc=(unsigned int *)(*os_context_pc_addr(context));
+ unsigned int *next_pc;
+ int op = orig_inst >> 26;;
+
+ orig_sigmask = *os_context_sigmask_addr(context);
+ sigaddset_blockable(os_context_sigmask_addr(context));
+
+ /* Put the original instruction back. */
+ *pc = orig_inst;
+ os_flush_icache((os_vm_address_t)pc, sizeof(unsigned long));
+ skipped_break_addr = pc;
+
+ /* Figure out where we will end up after running the displaced
+ * instruction */
+ if (op == 0x1a || (op&0xf) == 0x30) /* a branch */
+ /* The cast to long is just to shut gcc up. */
+ next_pc = (unsigned int *)((long)emulate_branch(context,orig_inst));
+ else
+ next_pc = pc+1;
+
+ /* Set the after breakpoint. */
+ displaced_after_inst = *next_pc;
+ *next_pc = BREAKPOINT_INST;
+ after_breakpoint=1;
+ os_flush_icache((os_vm_address_t)next_pc, sizeof(unsigned long));
}
-#define AfterBreakpoint 100
-
-static void sigill_handler(int signal, siginfo_t *siginfo, os_context_t *context) {
- fake_foreign_function_call(context);
- ldb_monitor();
-}
-
-static void sigtrap_handler(int signal, siginfo_t *siginfo, os_context_t *context)
+static void
+sigtrap_handler(int signal, siginfo_t *siginfo, os_context_t *context)
{
- /* Don't disallow recursive breakpoint traps. Otherwise, we can't */
- /* use debugger breakpoints anywhere in here. */
-
- sigset_t *mask=(os_context_sigmask_addr(context));
unsigned int code;
- fprintf(stderr,"sigtrap_handler:signal %d context=%p ",signal,context);
- sigsetmask(mask);
-
- /* this is different from how CMUCL does it. CMUCL used
- * "call_pal PAL_gentrap", which doesn't do anything on Linux
- * so screwed up our offsets in odd ways. We use "bpt" instead
- */
+#ifdef LISP_FEATURE_LINUX
+ os_restore_fp_control(context);
+#endif
- /* probably we should
- assert(*(unsigned int*)(*os_context_pc_addr(context)-4) == BREAKPOINT_INST)
- but I've not decided a good way to handle it if it turns out not to be
- */
+ /* this is different from how CMUCL does it. CMUCL used "call_pal
+ * PAL_gentrap", which doesn't do anything on Linux (unless NL0
+ * contains certain specific values). We use "bugchk" instead.
+ * It's (for our purposes) just the same as bpt but has a
+ * different opcode so we can test whether we're dealing with a
+ * breakpoint or a "system service" */
+
+ if ((*(unsigned int*)(*os_context_pc_addr(context)-4))==BREAKPOINT_INST) {
+ if (after_breakpoint) {
+ /* see comments above arch_do_displaced_inst. This is where
+ * we reinsert the breakpoint that we removed earlier */
+
+ *os_context_pc_addr(context) -=4;
+ *skipped_break_addr = BREAKPOINT_INST;
+ os_flush_icache((os_vm_address_t)skipped_break_addr,
+ sizeof(unsigned long));
+ skipped_break_addr = NULL;
+ *(unsigned int *)*os_context_pc_addr(context) =
+ displaced_after_inst;
+ os_flush_icache((os_vm_address_t)*os_context_pc_addr(context), sizeof(unsigned long));
+ *os_context_sigmask_addr(context)= orig_sigmask;
+ after_breakpoint=0; /* false */
+ return;
+ } else
+ code = trap_Breakpoint;
+ } else
+ /* a "system service" */
code=*((u32 *)(*os_context_pc_addr(context)));
- fprintf(stderr,"pc=%lx code=%d, inst=%x\n",
- *os_context_pc_addr(context), code,
- *(unsigned int*)(*os_context_pc_addr(context)-4));
+
switch (code) {
case trap_PendingInterrupt:
- arch_skip_instruction(context);
- interrupt_handle_pending(context);
- break;
+ arch_skip_instruction(context);
+ interrupt_handle_pending(context);
+ break;
case trap_Halt:
- fake_foreign_function_call(context);
- lose("%%primitive halt called; the party is over.\n");
+ fake_foreign_function_call(context);
+ lose("%%primitive halt called; the party is over.\n");
case trap_Error:
case trap_Cerror:
- interrupt_internal_error(signal, siginfo, context, code==trap_Cerror);
- break;
+ interrupt_internal_error(signal, siginfo, context, code==trap_Cerror);
+ break;
- case trap_Breakpoint:
+ case trap_Breakpoint: /* call lisp-level handler */
*os_context_pc_addr(context) -=4;
- handle_breakpoint(signal, siginfo, context);
- break;
+ handle_breakpoint(signal, siginfo, context);
+ break;
- case trap_FunctionEndBreakpoint:
+ case trap_FunEndBreakpoint:
*os_context_pc_addr(context) -=4;
- *os_context_pc_addr(context) = (int)handle_function_end_breakpoint(signal, siginfo, context);
- break;
-
- case AfterBreakpoint:
- *os_context_pc_addr(context) -=4;
- *skipped_break_addr = BREAKPOINT_INST;
- os_flush_icache((os_vm_address_t)skipped_break_addr,
- sizeof(unsigned long));
- skipped_break_addr = NULL;
- *(unsigned int *)*os_context_pc_addr(context) = displaced_after_inst;
- os_flush_icache((os_vm_address_t)*os_context_pc_addr(context), sizeof(unsigned long));
- *os_context_sigmask_addr(context)= orig_sigmask;
- after_breakpoint=0; /* NULL; */
- break;
+ *os_context_pc_addr(context) =
+ (int)handle_fun_end_breakpoint(signal, siginfo, context);
+ break;
default:
- interrupt_handle_now(signal, siginfo, context);
- break;
+ fprintf(stderr, "unidentified breakpoint/trap %d\n",code);
+ interrupt_handle_now(signal, siginfo, context);
+ break;
}
}
-#define FIXNUM_VALUE(lispobj) (((int)lispobj)>>2)
+unsigned long
+arch_get_fp_control()
+{
+ return ieee_get_fp_control();
+}
-static void sigfpe_handler(int signal, int code, os_context_t *context)
+void
+arch_set_fp_control(unsigned long fp)
{
+ ieee_set_fp_control(fp);
}
+
void arch_install_interrupt_handlers()
{
- undoably_install_low_level_interrupt_handler(SIGILL, sigill_handler);
undoably_install_low_level_interrupt_handler(SIGTRAP, sigtrap_handler);
- undoably_install_low_level_interrupt_handler(SIGFPE, sigfpe_handler);
}
extern lispobj call_into_lisp(lispobj fun, lispobj *args, int nargs);
return call_into_lisp(function, args, 3);
}
-
-/* This is apparently called by emulate_branch, but isn't defined. So */
-/* just do nothing and hope it works... */
-
-void cacheflush(void)
-{
- /* hoping probably isn't _actually_ enough. we should call_pal imb,
- according to the arch ref manual
- */
-}
projects / sbcl.git / blobdiff