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Minor cleanup and (very) small micro optimization to Xsyscall (and the
linux one)..
This commit is contained in:
David Greenman
parent
dd4e7c343b
commit
0e1815bb54
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=10609
@ -30,22 +30,16 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: exception.s,v 1.9 1995/06/11 19:31:13 rgrimes Exp $
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* $Id: exception.s,v 1.10 1995/08/15 19:23:33 bde Exp $
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*/
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#include "npx.h" /* NNPX */
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#include "assym.s" /* system defines */
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#include <sys/errno.h> /* error return codes */
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#include <machine/spl.h> /* SWI_AST_MASK ... */
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#include <machine/psl.h> /* PSL_I */
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#include <machine/trap.h> /* trap codes */
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#include <sys/syscall.h> /* syscall numbers */
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#include <machine/asmacros.h> /* miscellaneous macros */
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#define KDSEL 0x10 /* kernel data selector */
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@ -230,19 +224,26 @@ _bpttraps:
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#endif
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/*
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* Call gate entry for syscall
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* Call gate entry for syscall.
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* The intersegment call has been set up to specify one dummy parameter.
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* This leaves a place to put eflags so that the call frame can be
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* converted to a trap frame. Note that the eflags is (semi-)bogusly
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* pushed into (what will be) tf_err and then copied later into the
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* final spot. It has to be done this way because esp can't be just
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* temporarily altered for the pushfl - an interrupt might come in
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* and clobber the saved cs/eip.
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*/
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SUPERALIGN_TEXT
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IDTVEC(syscall)
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pushfl /* Room for tf_err */
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pushfl /* Room for tf_trapno */
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pushfl /* save eflags in tf_err for now */
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subl $4,%esp /* skip over tf_trapno */
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pushal
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pushl %ds
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pushl %es
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movl $KDSEL,%eax /* switch to kernel segments */
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movl %ax,%ds
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movl %ax,%es
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movl TF_ERR(%esp),%eax /* copy eflags from tf_err to fs_eflags */
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movl TF_ERR(%esp),%eax /* copy saved eflags to final spot */
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movl %eax,TF_EFLAGS(%esp)
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FAKE_MCOUNT(12*4(%esp))
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incl _cnt+V_SYSCALL
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@ -263,16 +264,13 @@ IDTVEC(syscall)
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*/
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SUPERALIGN_TEXT
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IDTVEC(linux_syscall)
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pushfl /* Room for tf_err */
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pushfl /* Room for tf_trapno */
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subl $8,%esp /* skip over tf_trapno and tf_err */
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pushal
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pushl %ds
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pushl %es
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movl $KDSEL,%eax /* switch to kernel segments */
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movl %ax,%ds
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movl %ax,%es
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movl TF_ERR(%esp),%eax /* copy eflags from tf_err to fs_eflags */
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movl %eax,TF_EFLAGS(%esp)
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FAKE_MCOUNT(12*4(%esp))
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incl _cnt+V_SYSCALL
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movl $SWI_AST_MASK,_cpl
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@ -30,22 +30,16 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: exception.s,v 1.9 1995/06/11 19:31:13 rgrimes Exp $
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* $Id: exception.s,v 1.10 1995/08/15 19:23:33 bde Exp $
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*/
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#include "npx.h" /* NNPX */
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#include "assym.s" /* system defines */
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#include <sys/errno.h> /* error return codes */
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#include <machine/spl.h> /* SWI_AST_MASK ... */
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#include <machine/psl.h> /* PSL_I */
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#include <machine/trap.h> /* trap codes */
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#include <sys/syscall.h> /* syscall numbers */
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#include <machine/asmacros.h> /* miscellaneous macros */
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#define KDSEL 0x10 /* kernel data selector */
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@ -230,19 +224,26 @@ _bpttraps:
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#endif
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/*
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* Call gate entry for syscall
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* Call gate entry for syscall.
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* The intersegment call has been set up to specify one dummy parameter.
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* This leaves a place to put eflags so that the call frame can be
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* converted to a trap frame. Note that the eflags is (semi-)bogusly
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* pushed into (what will be) tf_err and then copied later into the
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* final spot. It has to be done this way because esp can't be just
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* temporarily altered for the pushfl - an interrupt might come in
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* and clobber the saved cs/eip.
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*/
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SUPERALIGN_TEXT
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IDTVEC(syscall)
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pushfl /* Room for tf_err */
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pushfl /* Room for tf_trapno */
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pushfl /* save eflags in tf_err for now */
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subl $4,%esp /* skip over tf_trapno */
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pushal
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pushl %ds
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pushl %es
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movl $KDSEL,%eax /* switch to kernel segments */
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movl %ax,%ds
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movl %ax,%es
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movl TF_ERR(%esp),%eax /* copy eflags from tf_err to fs_eflags */
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movl TF_ERR(%esp),%eax /* copy saved eflags to final spot */
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movl %eax,TF_EFLAGS(%esp)
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FAKE_MCOUNT(12*4(%esp))
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incl _cnt+V_SYSCALL
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@ -263,16 +264,13 @@ IDTVEC(syscall)
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*/
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SUPERALIGN_TEXT
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IDTVEC(linux_syscall)
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pushfl /* Room for tf_err */
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pushfl /* Room for tf_trapno */
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subl $8,%esp /* skip over tf_trapno and tf_err */
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pushal
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pushl %ds
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pushl %es
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movl $KDSEL,%eax /* switch to kernel segments */
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movl %ax,%ds
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movl %ax,%es
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movl TF_ERR(%esp),%eax /* copy eflags from tf_err to fs_eflags */
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movl %eax,TF_EFLAGS(%esp)
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FAKE_MCOUNT(12*4(%esp))
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incl _cnt+V_SYSCALL
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movl $SWI_AST_MASK,_cpl
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@ -30,22 +30,16 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: exception.s,v 1.9 1995/06/11 19:31:13 rgrimes Exp $
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* $Id: exception.s,v 1.10 1995/08/15 19:23:33 bde Exp $
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*/
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#include "npx.h" /* NNPX */
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#include "assym.s" /* system defines */
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#include <sys/errno.h> /* error return codes */
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#include <machine/spl.h> /* SWI_AST_MASK ... */
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#include <machine/psl.h> /* PSL_I */
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#include <machine/trap.h> /* trap codes */
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#include <sys/syscall.h> /* syscall numbers */
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#include <machine/asmacros.h> /* miscellaneous macros */
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#define KDSEL 0x10 /* kernel data selector */
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@ -230,19 +224,26 @@ _bpttraps:
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#endif
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/*
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* Call gate entry for syscall
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* Call gate entry for syscall.
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* The intersegment call has been set up to specify one dummy parameter.
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* This leaves a place to put eflags so that the call frame can be
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* converted to a trap frame. Note that the eflags is (semi-)bogusly
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* pushed into (what will be) tf_err and then copied later into the
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* final spot. It has to be done this way because esp can't be just
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* temporarily altered for the pushfl - an interrupt might come in
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* and clobber the saved cs/eip.
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*/
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SUPERALIGN_TEXT
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IDTVEC(syscall)
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pushfl /* Room for tf_err */
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pushfl /* Room for tf_trapno */
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pushfl /* save eflags in tf_err for now */
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subl $4,%esp /* skip over tf_trapno */
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pushal
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pushl %ds
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pushl %es
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movl $KDSEL,%eax /* switch to kernel segments */
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movl %ax,%ds
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movl %ax,%es
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movl TF_ERR(%esp),%eax /* copy eflags from tf_err to fs_eflags */
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movl TF_ERR(%esp),%eax /* copy saved eflags to final spot */
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movl %eax,TF_EFLAGS(%esp)
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FAKE_MCOUNT(12*4(%esp))
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incl _cnt+V_SYSCALL
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@ -263,16 +264,13 @@ IDTVEC(syscall)
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*/
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SUPERALIGN_TEXT
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IDTVEC(linux_syscall)
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pushfl /* Room for tf_err */
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pushfl /* Room for tf_trapno */
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subl $8,%esp /* skip over tf_trapno and tf_err */
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pushal
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pushl %ds
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pushl %es
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movl $KDSEL,%eax /* switch to kernel segments */
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movl %ax,%ds
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movl %ax,%es
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movl TF_ERR(%esp),%eax /* copy eflags from tf_err to fs_eflags */
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movl %eax,TF_EFLAGS(%esp)
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FAKE_MCOUNT(12*4(%esp))
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incl _cnt+V_SYSCALL
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movl $SWI_AST_MASK,_cpl
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