#include "globals.h"
#include "validate.h"
#include "os.h"
+#include "interrupt.h"
#include "lispregs.h"
#include "signal.h"
#include "interrupt.h"
#endif
#endif
+/* Magic encoding for the instruction used for traps. */
+#define TRAP_INSTRUCTION(trap) ((3<<26) | (6 << 21) | (trap))
+
void arch_init() {
}
{
os_vm_address_t addr;
-#if defined(LISP_FEATURE_NETBSD)
+#if defined(LISP_FEATURE_NETBSD) || defined(LISP_FEATURE_OPENBSD)
addr = (os_vm_address_t) (code->si_addr);
#else
addr = (os_vm_address_t) (*os_context_register_addr(context,PT_DAR));
* The foreign_function_call_active used to live at each call-site
* to arch_pseudo_atomic_atomic, but this seems clearer.
* --NS 2007-05-15 */
- return (!foreign_function_call_active)
+ return (!foreign_function_call_active_p(arch_os_get_current_thread()))
&& ((*os_context_register_addr(context,reg_ALLOC)) & 4);
}
{
unsigned int *ptr = (unsigned int *)pc;
unsigned int result = *ptr;
- *ptr = (3<<26) | (5 << 21) | trap_Breakpoint;
+ *ptr = TRAP_INSTRUCTION(trap_Breakpoint);
os_flush_icache((os_vm_address_t) pc, sizeof(unsigned int));
return result;
}
static unsigned int *skipped_break_addr, displaced_after_inst;
static sigset_t orig_sigmask;
+static boolean
+should_branch(os_context_t *context, unsigned int orig_inst)
+{
+ /* orig_inst is a conditional branch instruction. We need to
+ * know if the branch will be taken if executed in context. */
+ int ctr = *os_context_ctr_addr(context);
+ int cr = *os_context_cr_addr(context);
+ int bo_field = (orig_inst >> 21) & 0x1f;
+ int bi_field = (orig_inst >> 16) & 0x1f;
+ int ctr_ok;
+
+ if (!(bo_field & 4)) ctr--; /* Decrement CTR if necessary. */
+
+ ctr_ok = (bo_field & 4) || ((ctr == 0) == ((bo_field & 2) == 2));
+ return ctr_ok && ((bo_field & 0x10) ||
+ !(((cr >> (31-bi_field)) ^ (bo_field >> 3)) & 1));
+}
+
void
arch_do_displaced_inst(os_context_t *context, unsigned int orig_inst)
{
/* not sure how we ensure that we get the breakpoint reinstalled
* after doing this -dan */
unsigned int *pc = (unsigned int *)(*os_context_pc_addr(context));
+ unsigned int *next_pc;
+ int op = orig_inst >> 26;
+ int sub_op = (orig_inst & 0x7fe) >> 1; /* XL-form sub-opcode */
orig_sigmask = *os_context_sigmask_addr(context);
sigaddset_blockable(os_context_sigmask_addr(context));
os_flush_icache((os_vm_address_t) pc, sizeof(unsigned int));
skipped_break_addr = pc;
- /* FIXME: we should apparently be installing the after-breakpoint
- * here, but would need to find the next instruction address for
- * it first. alpha-arch.c shows how to do it. --NS 2007-04-02 */
+ /* Figure out where we will end up after running the displaced
+ * instruction by defaulting to the next instruction in the stream
+ * and then checking for branch instructions. FIXME: This will
+ * probably screw up if it attempts to step a trap instruction. */
+ next_pc = pc + 1;
+
+ if (op == 18) {
+ /* Branch I-form */
+ unsigned int displacement = orig_inst & 0x03fffffc;
+ /* Sign extend */
+ if (displacement & 0x02000000) {
+ displacement |= 0xc0000000;
+ }
+ if (orig_inst & 2) { /* Absolute Address */
+ next_pc = (unsigned int *)displacement;
+ } else {
+ next_pc = (unsigned int *)(((unsigned int)pc) + displacement);
+ }
+ } else if ((op == 16)
+ && should_branch(context, orig_inst)) {
+ /* Branch Conditional B-form */
+ unsigned int displacement = orig_inst & 0x0000fffc;
+ /* Sign extend */
+ if (displacement & 0x00008000) {
+ displacement |= 0xffff0000;
+ }
+ if (orig_inst & 2) { /* Absolute Address */
+ next_pc = (unsigned int *)displacement;
+ } else {
+ next_pc = (unsigned int *)(((unsigned int)pc) + displacement);
+ }
+ } else if ((op == 19) && (sub_op == 16)
+ && should_branch(context, orig_inst)) {
+ /* Branch Conditional to Link Register XL-form */
+ next_pc = (unsigned int *)
+ ((*os_context_lr_addr(context)) & ~3);
+ } else if ((op == 19) && (sub_op == 528)
+ && should_branch(context, orig_inst)) {
+ /* Branch Conditional to Count Register XL-form */
+ next_pc = (unsigned int *)
+ ((*os_context_ctr_addr(context)) & ~3);
+ }
+
+ /* Set the "after" breakpoint. */
+ displaced_after_inst = *next_pc;
+ *next_pc = TRAP_INSTRUCTION(trap_AfterBreakpoint);
+ os_flush_icache((os_vm_address_t)next_pc, sizeof(unsigned int));
}
#ifdef LISP_FEATURE_GENCGC
/* I don't think it's possible for us NOT to be in lisp when we get
* here. Remove this later? */
- were_in_lisp = !foreign_function_call_active;
+ were_in_lisp = !foreign_function_call_active_p(arch_os_get_current_thread());
if (were_in_lisp) {
fake_foreign_function_call(context);
dynamic_space_free_pointer);
#endif
- memory = (char *) alloc(size);
+ {
+ struct interrupt_data *data =
+ arch_os_get_current_thread()->interrupt_data;
+ data->allocation_trap_context = context;
+ memory = (char *) alloc(size);
+ data->allocation_trap_context = 0;
+ }
#if 0
fprintf(stderr, "alloc returned %p\n", memory);
void
arch_handle_after_breakpoint(os_context_t *context)
{
- *skipped_break_addr = trap_Breakpoint;
+ *skipped_break_addr = TRAP_INSTRUCTION(trap_Breakpoint);
+ os_flush_icache((os_vm_address_t) skipped_break_addr,
+ sizeof(unsigned int));
skipped_break_addr = NULL;
*(unsigned int *)*os_context_pc_addr(context)
= displaced_after_inst;
inst = (19 << 26) | (20 << 21) | (528 << 1);
*inst_ptr++ = inst;
-
- *inst_ptr++ = inst;
-
os_flush_icache((os_vm_address_t) reloc_addr, (char*) inst_ptr - (char*) reloc_addr);
}
projects / sbcl.git / blobdiff