minix/lib/libc/arch/i386/int64/sub64u.S

/*	sub64() - unsigned from 64 bit subtraction	Author: Kees J. Bot */
/*								7 Dec 1995 */
#include <minix/compiler.h>
#include <machine/asm.h>

ENTRY(sub64u)
/* u64_t sub64u(u64_t i, unsigned j); */
ENTRY(sub64ul)
/* u64_t sub64ul(u64_t i, unsigned long j); */
	movl	4(%esp), %eax
	movl	8(%esp), %edx
	subl	16(%esp), %edx
	movl	%edx, (%eax)
	movl	12(%esp), %edx
	sbbl	$0, %edx
	movl	%edx, 4(%eax)
	ret BYTES_TO_POP_ON_STRUCT_RETURN

/* */
/* $PchId: sub64u.ack.s,v 1.2 1996/04/11 18:59:57 philip Exp $ */
Convert library asm files to GAS syntax 2010-03-03 15:27:30 +01:00			`/* sub64() - unsigned from 64 bit subtraction Author: Kees J. Bot */`
			`/* 7 Dec 1995 */`
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 18:25:17 +01:00			`#include <minix/compiler.h>`
Macros for symbols used in both ASM and C -The macros take care of prepending the leading underscore when necessary. 2010-08-17 18:44:07 +02:00			`#include <machine/asm.h>`
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 18:25:17 +01:00
Macros for symbols used in both ASM and C -The macros take care of prepending the leading underscore when necessary. 2010-08-17 18:44:07 +02:00			`ENTRY(sub64u)`
Convert library asm files to GAS syntax 2010-03-03 15:27:30 +01:00			`/* u64_t sub64u(u64_t i, unsigned j); */`
Macros for symbols used in both ASM and C -The macros take care of prepending the leading underscore when necessary. 2010-08-17 18:44:07 +02:00			`ENTRY(sub64ul)`
Convert library asm files to GAS syntax 2010-03-03 15:27:30 +01:00			`/* u64_t sub64ul(u64_t i, unsigned long j); */`
			`movl 4(%esp), %eax`
			`movl 8(%esp), %edx`
			`subl 16(%esp), %edx`
			`movl %edx, (%eax)`
			`movl 12(%esp), %edx`
			`sbbl $0, %edx`
			`movl %edx, 4(%eax)`
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 18:25:17 +01:00			`ret BYTES_TO_POP_ON_STRUCT_RETURN`
Convert library asm files to GAS syntax 2010-03-03 15:27:30 +01:00
			`/* */`
			`/* $PchId: sub64u.ack.s,v 1.2 1996/04/11 18:59:57 philip Exp $ */`