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Statically align the stack at function boundaries (bug 5842, r=ds).

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This commit is contained in:
David Anderson 2013-08-11 11:27:19 -07:00
parent ce542ac5f6
commit 449617474b
2 changed files with 15 additions and 9 deletions
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6
sourcepawn/jit/dll_exports.cpp
View File

@ -146,6 +146,11 @@ static cell_t PrintNums(IPluginContext *cx, const cell_t *params)
return 1;
}
static cell_t DoNothing(IPluginContext *cx, const cell_t *params)
{
return 1;
}
static void BindNative(IPluginRuntime *rt, const char *name, SPVM_NATIVE_FUNC fn)
{
int err;
@ -185,6 +190,7 @@ static int Execute(const char *file)
BindNative(rt, "printnum", PrintNum);
BindNative(rt, "printnums", PrintNums);
BindNative(rt, "printfloat", PrintFloat);
BindNative(rt, "donothing", DoNothing);
IPluginFunction *fun = rt->GetFunctionByName("main");
if (!fun)

18
sourcepawn/jit/x86/jit_x86.cpp
View File

@ -614,6 +614,9 @@ Compiler::emitOp(OPCODE op)
__ movl(frm, stk);
__ subl(tmp, dat);
__ movl(Operand(info, AMX_INFO_FRAME), tmp);
// Align the stack to 16-bytes (each call adds 4 bytes).
__ subl(esp, 12);
break;
case OP_IDXADDR_B:
@ -988,6 +991,7 @@ Compiler::emitOp(OPCODE op)
// Remove parameters.
__ movl(tmp, Operand(stk, 0));
__ lea(stk, Operand(stk, tmp, ScaleFour, 4));
__ addl(esp, 12);
__ ret();
break;
}
@ -1585,12 +1589,6 @@ Compiler::emitNativeCall(OPCODE op)
// Save registers.
__ push(edx);
// Align the stack to 16 bytes.
__ push(ebx);
__ movl(ebx, esp);
__ andl(esp, 0xfffffff0);
__ subl(esp, 4);
// Push the parameters for the C++ function.
__ push(stk);
__ push(native_index);
@ -1616,9 +1614,8 @@ Compiler::emitNativeCall(OPCODE op)
__ j(not_zero, &extern_error_);
// Restore local state.
__ movl(esp, ebx);
__ pop(ebx);
__ addl(stk, dat);
__ addl(esp, 12);
__ pop(edx);
if (op == OP_SYSREQ_N) {
@ -1786,7 +1783,10 @@ GenerateEntry(void **retp)
__ movl(ebx, edi);
__ movl(Operand(esi, AMX_INFO_NSTACK), esp);
// Call into plugin.
// Align the stack.
__ andl(esp, 0xfffffff0);
// Call into plugin (align the stack first).
__ call(ecx);
__ movl(ecx, Operand(info, AMX_INFO_RETVAL));