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fix stack alignment dynamically for OP_BLOCK_COPY

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Ludwig Nussel 2010-06-02 14:46:16 +00:00
parent 2950bb98ea
commit 233fcb0caa
1 changed files with 7 additions and 2 deletions
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9
code/qcommon/vm_x86_64.c
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@ -757,13 +757,18 @@ emit_do_syscall:
emit("push %%r8");
emit("push %%r9");
emit("push %%r10");
emit("push %%r10");
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("movl 4(%%rsi), %%edi"); // 1st argument dest
emit("movl 8(%%rsi), %%esi"); // 2nd argument src
emit("movl $%d, %%edx", iarg); // 3rd argument count
emit("movq $%"PRIu64", %%rax", (uint64_t)block_copy_vm);
emit("callq *%%rax");
emit("pop %%r10");
emit("pop %%rbx");
emit("addq %%rbx, %%rsp");
emit("pop %%r10");
emit("pop %%r9");
emit("pop %%r8");