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Add instruction number checks to jumps and calls to SPARC VM, patch by David Miller

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This commit is contained in:
Thilo Schulz 2011-05-24 19:46:52 +00:00
parent 4b1418c4ad
commit bd8d60f55c
1 changed files with 35 additions and 13 deletions
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48
code/qcommon/vm_sparc.c
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@ -511,6 +511,7 @@ typedef struct VM_Data {
int (*AsmCall)(int, int);
void (*BlockCopy)(unsigned int, unsigned int, unsigned int);
unsigned int *iPointers;
void (*ErrJump)(void);
unsigned int data[0];
} vm_data_t;
@ -698,11 +699,20 @@ static void dst_insn_append(struct func_info * const fp)
fp->insn_index = 0;
}
static void jump_insn_append(struct func_info * const fp, enum sparc_iname iname, int dest)
static void ErrJump(void)
{
Com_Error(ERR_DROP, "program tried to execute code outside VM\n");
exit(1);
}
static void jump_insn_append(vm_t *vm, struct func_info * const fp, enum sparc_iname iname, int dest)
{
struct jump_insn *jp = Z_Malloc(sizeof(*jp));
struct dst_insn *dp;
if (dest < 0 || dest >= vm->instructionCount)
ErrJump();
dp = dst_new(fp, 2, jp, 0);
jp->jump_iname = iname;
@ -734,10 +744,10 @@ static void end_emit(struct func_info * const fp)
dst_insn_append(fp);
}
static void emit_jump(struct func_info * const fp, enum sparc_iname iname, int dest)
static void emit_jump(vm_t *vm, struct func_info * const fp, enum sparc_iname iname, int dest)
{
end_emit(fp);
jump_insn_append(fp, iname, dest);
jump_insn_append(vm, fp, iname, dest);
}
static void analyze_function(struct func_info * const fp)
@ -860,7 +870,7 @@ do { int saved_i_count = (fp)->saved_icount; \
(fp)->saved_icount = saved_i_count; \
} while (0)
static void compile_one_insn(struct func_info * const fp, struct src_insn *sp)
static void compile_one_insn(vm_t *vm, struct func_info * const fp, struct src_insn *sp)
{
start_emit(fp, sp->i_count);
@ -928,11 +938,17 @@ static void compile_one_insn(struct func_info * const fp, struct src_insn *sp)
case OP_JUMP:
if (fp->cached_const) {
EMIT_FALSE_CONST(fp);
emit_jump(fp, BA, fp->cached_const->arg.i);
emit_jump(vm, fp, BA, fp->cached_const->arg.i);
} else {
MAYBE_EMIT_CONST(fp);
in(LDLI, rVMDATA, VM_Data_Offset(iPointers), rTMP);
in(SETHI, vm->instructionCount >> 10, rTMP);
in(ORI, rTMP, vm->instructionCount & 0x3ff, rTMP);
in(SUBCC, rTMP, rFIRST(fp), G0);
in(BLEU, +4*5);
in(LDLI, rVMDATA, VM_Data_Offset(ErrJump), rTMP);
in(SLLI, rFIRST(fp), 2, rFIRST(fp));
in(LDLI, rVMDATA, VM_Data_Offset(iPointers), rTMP);
in(LDL, rTMP, rFIRST(fp), rTMP);
in(JMPL, rTMP, G0, G0);
in(NOP);
@ -943,7 +959,7 @@ static void compile_one_insn(struct func_info * const fp, struct src_insn *sp)
if (fp->cached_const) {
EMIT_FALSE_CONST(fp);
if (fp->cached_const->arg.si >= 0) {
emit_jump(fp, CALL, fp->cached_const->arg.i);
emit_jump(vm, fp, CALL, fp->cached_const->arg.i);
} else {
in(LDLI, rVMDATA, VM_Data_Offset(CallThunk), rTMP);
in(LDLI, rVMDATA, VM_Data_Offset(AsmCall), O3);
@ -959,6 +975,11 @@ static void compile_one_insn(struct func_info * const fp, struct src_insn *sp)
in(NOP);
/* normal call */
in(SETHI, vm->instructionCount >> 10, rTMP);
in(ORI, rTMP, vm->instructionCount & 0x3ff, rTMP);
in(SUBCC, rTMP, rFIRST(fp), G0);
in(BLEU, +4*9);
in(LDLI, rVMDATA, VM_Data_Offset(ErrJump), rTMP);
in(LDLI, rVMDATA, VM_Data_Offset(iPointers), O5);
in(SLLI, rFIRST(fp), 2, rFIRST(fp));
in(LDL, O5, rFIRST(fp), rTMP);
@ -1124,7 +1145,7 @@ static void compile_one_insn(struct func_info * const fp, struct src_insn *sp)
case OP_GTU: iname = BGU; break;
case OP_LEU: iname = BLEU; break;
}
emit_jump(fp, iname, sp->arg.i);
emit_jump(vm, fp, iname, sp->arg.i);
POP_GPR(fp);
POP_GPR(fp);
break;
@ -1297,7 +1318,7 @@ static void compile_one_insn(struct func_info * const fp, struct src_insn *sp)
case OP_GTF: iname = FBG; break;
case OP_LEF: iname = FBLE; break;
}
emit_jump(fp, iname, sp->arg.i);
emit_jump(vm, fp, iname, sp->arg.i);
POP_FPR(fp);
POP_FPR(fp);
break;
@ -1344,7 +1365,7 @@ static void free_source_insns(struct func_info * const fp)
}
}
static void compile_function(struct func_info * const fp)
static void compile_function(vm_t *vm, struct func_info * const fp)
{
struct src_insn *sp;
@ -1359,7 +1380,7 @@ static void compile_function(struct func_info * const fp)
sp = fp->first;
while ((sp = sp->next) != NULL)
compile_one_insn(fp, sp);
compile_one_insn(vm, fp, sp);
free_source_insns(fp);
}
@ -1478,6 +1499,7 @@ static void sparc_compute_code(vm_t *vm, struct func_info * const fp)
data->iPointers = (unsigned int *) vm->instructionPointers;
data->dataLength = VM_Data_Offset(data[fp->data_num]);
data->codeLength = (code_now - code_begin) * sizeof(unsigned int);
data->ErrJump = ErrJump;
#if 0
{
@ -1564,7 +1586,7 @@ void VM_Compile(vm_t *vm, vmHeader_t *header)
if (op == OP_ENTER) {
if (fi.first->next)
compile_function(&fi);
compile_function(vm, &fi);
fi.first->next = NULL;
fi.last = fi.first;
fi.has_call = fi.need_float_tmp = 0;
@ -1592,7 +1614,7 @@ void VM_Compile(vm_t *vm, vmHeader_t *header)
fi.last->next = sp;
fi.last = sp;
}
compile_function(&fi);
compile_function(vm, &fi);
Z_Free(fi.first);