tlibthread: context switching for arm, still not complete - plan9port - [fork] Plan 9 from user space
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---
(DIR) commit ba940ae61c4c33766e385b63ecf49bec25f301d7
(DIR) parent 778ec84c9c817be65404193e2156c8fdb90b846a
(HTM) Author: Russ Cox <rsc@swtch.com>
Date: Wed, 18 Nov 2009 04:12:17 -0500
libthread: context switching for arm, still not complete
Diffstat:
A src/libthread/Linux-arm-context.s | 41 +++++++++++++++++++++++++++++++
A src/libthread/Linux-arm-swapcontex… | 26 ++++++++++++++++++++++++++
M src/libthread/sysofiles.sh | 7 +++++++
M src/libthread/threadimpl.h | 8 ++++----
4 files changed, 78 insertions(+), 4 deletions(-)
---
(DIR) diff --git a/src/libthread/Linux-arm-context.s b/src/libthread/Linux-arm-context.s
t@@ -0,0 +1,41 @@
+.globl mygetmcontext
+mygetmcontext:
+ str r1, [r0,#4]
+ str r2, [r0,#8]
+ str r3, [r0,#12]
+ str r4, [r0,#16]
+ str r5, [r0,#20]
+ str r6, [r0,#24]
+ str r7, [r0,#28]
+ str r8, [r0,#32]
+ str r9, [r0,#36]
+ str r10, [r0,#40]
+ str r11, [r0,#44]
+ str r12, [r0,#48]
+ str r13, [r0,#52]
+ str r14, [r0,#56]
+ /* store 1 as r0-to-restore */
+ mov r1, #1
+ str r1, [r0]
+ /* return 0 */
+ mov r0, #0
+ mov pc, lr
+
+.globl mysetmcontext
+mysetmcontext:
+ ldr r1, [r0,#4]
+ ldr r2, [r0,#8]
+ ldr r3, [r0,#12]
+ ldr r4, [r0,#16]
+ ldr r5, [r0,#20]
+ ldr r6, [r0,#24]
+ ldr r7, [r0,#28]
+ ldr r8, [r0,#32]
+ ldr r9, [r0,#36]
+ ldr r10, [r0,#40]
+ ldr r11, [r0,#44]
+ ldr r12, [r0,#48]
+ ldr r13, [r0,#52]
+ ldr r14, [r0,#56]
+ ldr r0, [r0]
+ mov pc, lr
(DIR) diff --git a/src/libthread/Linux-arm-swapcontext.c b/src/libthread/Linux-arm-swapcontext.c
t@@ -0,0 +1,26 @@
+#include "threadimpl.h"
+
+void
+makecontext(ucontext_t *uc, void (*fn)(void), int argc, ...)
+{
+ int i, *sp;
+ va_list arg;
+
+ sp = (int*)uc->uc_stack.ss_sp+uc->uc_stack.ss_size/4;
+ va_start(arg, argc);
+ for(i=0; i<4 && i<argc; i++)
+ uc->uc_mcontext.gregs[i] = va_arg(arg, uint);
+ va_end(arg);
+ uc->uc_mcontext.gregs[13] = (uint)sp;
+ uc->uc_mcontext.gregs[14] = (uint)fn;
+}
+
+int
+swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
+{
+ if(getcontext(oucp) == 0)
+ setcontext(ucp);
+ return 0;
+}
+
+
(DIR) diff --git a/src/libthread/sysofiles.sh b/src/libthread/sysofiles.sh
t@@ -4,6 +4,9 @@ test -f $PLAN9/config && . $PLAN9/config
tag="$OBJTYPE-$SYSNAME-${SYSVERSION:-`uname -r`}-${CC9:-cc}"
case "$tag" in
+arm-Linux-*)
+ echo ${SYSNAME}-${OBJTYPE}-asm.o $SYSNAME.o
+ ;;
*-Linux-2.6.*)
echo pthread.o
;;
t@@ -36,5 +39,9 @@ sparc64-Linux)
# so we supply our own copy from the latest glibc.
echo Linux-sparc64-context.o Linux-sparc64-swapcontext.o
;;
+arm-Linux)
+ # ARM doesn't supply them either.
+ echo Linux-arm-context.o Linux-arm-swapcontext.o
+ ;;
esac
(DIR) diff --git a/src/libthread/threadimpl.h b/src/libthread/threadimpl.h
t@@ -73,10 +73,10 @@ but surely the latter would be defined(__sparc__).
*/
#if defined(__arm__)
-int getmcontext(mcontext_t*);
-void setmcontext(const mcontext_t*);
-#define setcontext(u) setmcontext(&(u)->uc_mcontext)
-#define getcontext(u) getmcontext(&(u)->uc_mcontext)
+int mygetmcontext(mcontext_t*);
+void mysetmcontext(const mcontext_t*);
+#define setcontext(u) mysetmcontext(&(u)->uc_mcontext)
+#define getcontext(u) mygetmcontext(&(u)->uc_mcontext)
#endif