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another attempt to fix the alignment, this time hopfully for real

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This commit is contained in:
Ludwig Nussel 2007-07-03 12:53:00 +00:00
parent beaf352463
commit 8cb20658aa
1 changed files with 10 additions and 5 deletions
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15
code/qcommon/vm_x86_64.c
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@ -539,14 +539,19 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
emit("push %%r8");
emit("push %%r9");
emit("push %%r10");
emit("push %%r10"); // align!
emit("movq %%rsp, %%rbx"); // we need to align the stack pointer
emit("subq $8, %%rbx"); // |
emit("andq $127, %%rbx"); // |
emit("subq %%rbx, %%rsp"); // <-+
emit("push %%rbx");
emit("negl %%eax"); // convert to actual number
emit("decl %%eax");
// first argument already in rdi
emit("movq %%rax, %%rsi"); // second argument in rsi
emit("movq $%lu, %%rax", (unsigned long)callAsmCall);
emit("callq *%%rax");
emit("pop %%r10");
emit("pop %%rbx");
emit("addq %%rbx, %%rsp");
emit("pop %%r10");
emit("pop %%r9");
emit("pop %%r8");
@ -554,7 +559,7 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
emit("pop %%rsi");
// emit("frstor 4(%%rsi)");
emit("addq $4, %%rsi");
emit("movl %%eax, (%%rsi)");
emit("movl %%eax, (%%rsi)"); // store return value
break;
case OP_PUSH:
emit("addq $4, %%rsi");
@ -991,9 +996,9 @@ int VM_CallCompiled( vm_t *vm, int *args ) {
" movl %4,%%edi \r\n" \
" movq %2,%%r10 \r\n" \
" movq %3,%%r8 \r\n" \
" subq $8, %%rsp # fix alignment as call pushes one value \r\n" \
" subq $24, %%rsp # fix alignment as call pushes one value \r\n" \
" callq *%%r10 \r\n" \
" addq $8, %%rsp \r\n" \
" addq $24, %%rsp \r\n" \
" movl %%edi, %0 \r\n" \
" movq %%rsi, %1 \r\n" \
: "=m" (programStack), "=m" (opStack)