minix/lib/libc/arch/i386/int64/add64.S
Lorenzo Cavallaro a16308efdb cdecl calling convention expects the callee to pop the hidden pointer on
struct return. For example, GCC and LLVM comply with this (tested on IA32).

ACK doesn't seem to follow this convention and expects the caller to clean up
the stack. Compiling hand-written ACK-compliant assembly code (returning a 
struct) with GCC or LLVM used to break things (4-bytes misaligned stack).

The patch fixes this problem.
2010-03-24 17:25:17 +00:00

20 lines
422 B
ArmAsm

/* add64() - 64 bit addition Author: Kees J. Bot */
/* 7 Dec 1995 */
#include <minix/compiler.h>
.text
.globl _add64
_add64:
/* u64_t add64(u64_t i, u64_t j); */
movl 4(%esp), %eax
movl 8(%esp), %edx
addl 16(%esp), %edx
movl %edx, (%eax)
movl 12(%esp), %edx
adcl 20(%esp), %edx
movl %edx, 4(%eax)
ret BYTES_TO_POP_ON_STRUCT_RETURN
/* */
/* $PchId: add64.ack.s,v 1.2 1996/04/11 18:59:57 philip Exp $ */