minix/lib/libc/arch/i386/int64/mul64u.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
457 B
ArmAsm

/* mul64u() - unsigned long by unsigned multiply giving 64 bit result */
/* Author: Kees J. Bot */
/* 7 Dec 1995 */
#include <minix/compiler.h>
.text
.globl _mul64u
_mul64u:
/* u64_t mul64u(unsigned long i, unsigned j); */
movl 4(%esp), %ecx
movl 8(%esp), %eax
mull 12(%esp)
movl %eax, (%ecx)
movl %edx, 4(%ecx)
movl %ecx, %eax
ret BYTES_TO_POP_ON_STRUCT_RETURN
/* */
/* $PchId: mul64u.ack.s,v 1.2 1996/04/11 18:59:57 philip Exp $ */