Author: jhb
Date: Thu Oct 29 21:25:46 2015
New Revision: 290164
URL: https://svnweb.freebsd.org/changeset/base/290164
Log:
Use movw instead of movl (or plain mov) when moving segment registers
into memory. This is a nop on clang's assembler, but some assemblers
complain if the size suffix is incorrect.
Submitted by: bde
Modified:
head/sys/i386/i386/exception.s
head/sys/i386/include/asmacros.h
Modified: head/sys/i386/i386/exception.s
==============================================================================
--- head/sys/i386/i386/exception.s Thu Oct 29 21:12:57 2015
(r290163)
+++ head/sys/i386/i386/exception.s Thu Oct 29 21:25:46 2015
(r290164)
@@ -158,11 +158,11 @@ IDTVEC(xmm)
alltraps:
pushal
pushl $0
- movl %ds,(%esp)
+ movw %ds,(%esp)
pushl $0
- movl %es,(%esp)
+ movw %es,(%esp)
pushl $0
- movl %fs,(%esp)
+ movw %fs,(%esp)
alltraps_with_regs_pushed:
SET_KERNEL_SREGS
cld
@@ -237,11 +237,11 @@ IDTVEC(lcall_syscall)
subl $4,%esp /* skip over tf_trapno */
pushal
pushl $0
- movl %ds,(%esp)
+ movw %ds,(%esp)
pushl $0
- movl %es,(%esp)
+ movw %es,(%esp)
pushl $0
- movl %fs,(%esp)
+ movw %fs,(%esp)
SET_KERNEL_SREGS
cld
FAKE_MCOUNT(TF_EIP(%esp))
@@ -266,11 +266,11 @@ IDTVEC(int0x80_syscall)
subl $4,%esp /* skip over tf_trapno */
pushal
pushl $0
- movl %ds,(%esp)
+ movw %ds,(%esp)
pushl $0
- movl %es,(%esp)
+ movw %es,(%esp)
pushl $0
- movl %fs,(%esp)
+ movw %fs,(%esp)
SET_KERNEL_SREGS
cld
FAKE_MCOUNT(TF_EIP(%esp))
@@ -426,15 +426,15 @@ doreti_iret_fault:
subl $8,%esp
pushal
pushl $0
- movl %ds,(%esp)
+ movw %ds,(%esp)
.globl doreti_popl_ds_fault
doreti_popl_ds_fault:
pushl $0
- movl %es,(%esp)
+ movw %es,(%esp)
.globl doreti_popl_es_fault
doreti_popl_es_fault:
pushl $0
- movl %fs,(%esp)
+ movw %fs,(%esp)
.globl doreti_popl_fs_fault
doreti_popl_fs_fault:
sti
Modified: head/sys/i386/include/asmacros.h
==============================================================================
--- head/sys/i386/include/asmacros.h Thu Oct 29 21:12:57 2015
(r290163)
+++ head/sys/i386/include/asmacros.h Thu Oct 29 21:25:46 2015
(r290164)
@@ -147,11 +147,11 @@
pushl $0 ; /* dummy trap type */ \
pushal ; /* 8 ints */ \
pushl $0 ; /* save data and extra segments ... */ \
- mov %ds,(%esp) ; \
+ movw %ds,(%esp) ; \
pushl $0 ; \
- mov %es,(%esp) ; \
+ movw %es,(%esp) ; \
pushl $0 ; \
- mov %fs,(%esp)
+ movw %fs,(%esp)
#define POP_FRAME
\
popl %fs ; \
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