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cdecl calling convention expects the callee to pop the hidden pointer on

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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.
This commit is contained in:
Lorenzo Cavallaro 2010-03-24 17:25:17 +00:00
parent 5fd3f34273
commit a16308efdb
10 changed files with 57 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/Makefile
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@ -21,7 +21,8 @@ INCS+= minix/a.out.h minix/bitmap.h minix/callnr.h minix/cdrom.h \
minix/rs.h minix/safecopies.h minix/sef.h minix/sound.h \
minix/sys_config.h minix/sysinfo.h minix/syslib.h \
minix/sysutil.h minix/tty.h minix/type.h minix/types.h \
minix/u64.h minix/vfsif.h minix/vm.h
minix/u64.h minix/vfsif.h minix/vm.h \
minix/compiler.h minix/compiler-ack.h
INCS+= net/hton.h net/if.h net/ioctl.h net/netlib.h
INCS+= net/gen/arp_io.h net/gen/dhcp.h net/gen/ether.h \
net/gen/eth_hdr.h net/gen/eth_io.h net/gen/icmp.h \

9
include/minix/compiler-ack.h Normal file
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@ -0,0 +1,9 @@
/* Definitions for ACK-specific features. */
#ifndef _MINIX_COMPILER_ACK_H
#define _MINIX_COMPILER_ACK_H
/* ACK expects the caller to pop the hidden pointer on struct return. */
#define BYTES_TO_POP_ON_STRUCT_RETURN
#endif /* _MINIX_COMPILER_ACK_H */

25
include/minix/compiler.h Normal file
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@ -0,0 +1,25 @@
/* Definitions for compiler-specific features. */
#ifndef _MINIX_COMPILER_H
#define _MINIX_COMPILER_H
/*===========================================================================*
* Compiler overrides *
*===========================================================================*/
/* ACK */
#ifdef __ACK__
#include <minix/compiler-ack.h>
#endif
/*===========================================================================*
* Default values *
*===========================================================================*/
/*
* 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).
*/
#ifndef BYTES_TO_POP_ON_STRUCT_RETURN
#define BYTES_TO_POP_ON_STRUCT_RETURN $4
#endif
#endif /* _MINIX_COMPILER_H */

4
lib/libc/arch/i386/int64/add64.S
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@ -1,5 +1,7 @@
/* add64() - 64 bit addition Author: Kees J. Bot */
/* 7 Dec 1995 */
#include <minix/compiler.h>
.text
.globl _add64
@ -12,7 +14,7 @@ _add64:
movl 12(%esp), %edx
adcl 20(%esp), %edx
movl %edx, 4(%eax)
ret
ret BYTES_TO_POP_ON_STRUCT_RETURN
/* */
/* $PchId: add64.ack.s,v 1.2 1996/04/11 18:59:57 philip Exp $ */

4
lib/libc/arch/i386/int64/add64u.S
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@ -1,5 +1,7 @@
/* add64u() - unsigned to 64 bit addition Author: Kees J. Bot */
/* 7 Dec 1995 */
#include <minix/compiler.h>
.text
.globl _add64u, _add64ul
@ -14,7 +16,7 @@ _add64ul:
movl 12(%esp), %edx
adcl $0, %edx
movl %edx, 4(%eax)
ret
ret BYTES_TO_POP_ON_STRUCT_RETURN
/* */
/* $PchId: add64u.ack.s,v 1.2 1996/04/11 18:59:57 philip Exp $ */

4
lib/libc/arch/i386/int64/cvu64.S
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@ -1,5 +1,7 @@
/* cvu64() - unsigned converted to 64 bit Author: Kees J. Bot */
/* 7 Dec 1995 */
#include <minix/compiler.h>
.text
.globl _cvu64, _cvul64
@ -11,7 +13,7 @@ _cvul64:
movl 8(%esp), %edx
movl %edx, (%eax)
movl $0, 4(%eax)
ret
ret BYTES_TO_POP_ON_STRUCT_RETURN
/* */
/* $PchId: cvu64.ack.s,v 1.2 1996/04/11 18:59:57 philip Exp $ */

4
lib/libc/arch/i386/int64/make64.S
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@ -1,6 +1,8 @@
/* make64() - make a 64 bit number from two 32 bit halves */
/* Author: Kees J. Bot */
/* 7 Dec 1995 */
#include <minix/compiler.h>
.text
.globl _make64
@ -11,7 +13,7 @@ _make64:
movl %edx, (%eax)
movl 12(%esp), %edx
movl %edx, 4(%eax)
ret
ret BYTES_TO_POP_ON_STRUCT_RETURN
/* */
/* $PchId: make64.ack.s,v 1.2 1996/04/11 18:59:57 philip Exp $ */

4
lib/libc/arch/i386/int64/mul64u.S
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@ -1,6 +1,8 @@
/* mul64u() - unsigned long by unsigned multiply giving 64 bit result */
/* Author: Kees J. Bot */
/* 7 Dec 1995 */
#include <minix/compiler.h>
.text
.globl _mul64u
@ -12,7 +14,7 @@ _mul64u:
movl %eax, (%ecx)
movl %edx, 4(%ecx)
movl %ecx, %eax
ret
ret BYTES_TO_POP_ON_STRUCT_RETURN
/* */
/* $PchId: mul64u.ack.s,v 1.2 1996/04/11 18:59:57 philip Exp $ */

4
lib/libc/arch/i386/int64/sub64.S
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@ -1,5 +1,7 @@
/* sub64() - 64 bit subtraction Author: Kees J. Bot */
/* 7 Dec 1995 */
#include <minix/compiler.h>
.text
.globl _sub64
@ -12,7 +14,7 @@ _sub64:
movl 12(%esp), %edx
sbbl 20(%esp), %edx
movl %edx, 4(%eax)
ret
ret BYTES_TO_POP_ON_STRUCT_RETURN
/* */
/* $PchId: sub64.ack.s,v 1.2 1996/04/11 18:59:57 philip Exp $ */

4
lib/libc/arch/i386/int64/sub64u.S
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@ -1,5 +1,7 @@
/* sub64() - unsigned from 64 bit subtraction Author: Kees J. Bot */
/* 7 Dec 1995 */
#include <minix/compiler.h>
.text
.globl _sub64u, _sub64ul
@ -14,7 +16,7 @@ _sub64ul:
movl 12(%esp), %edx
sbbl $0, %edx
movl %edx, 4(%eax)
ret
ret BYTES_TO_POP_ON_STRUCT_RETURN
/* */
/* $PchId: sub64u.ack.s,v 1.2 1996/04/11 18:59:57 philip Exp $ */