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Fix user context save

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1203 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2008-11-11 22:49:11 +00:00
parent 416b903ed5
commit 8c98fc852d
1 changed files with 16 additions and 13 deletions
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29
arch/sh/src/sh1/sh1_saveusercontext.S
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@ -80,29 +80,32 @@ _up_saveusercontext:
/* On entry, R4 contains a reference to the register save structure
* to populate.
*
* Save a nonzero value for R0 in the register save area. This will
* will be the apparent return value when a context switch back to
* this thread is performed.
* Re-position to the end of the structure (+4_ so that we can use
* auto decrement
*/
mov #1, r0
mov.l r0, @r4
/* Move to the end of the structure so that we can use auto decrement */
add #(XCPTCONTEXT_SIZE-4), r0
add #(XCPTCONTEXT_SIZE), r4 /* R4: Address of last entry + 4 */
/* Save the necessary registers */
stc sr, r0 /* Get and save the SR */
mov.l r0, @-r4
sts.l pr, @-r4 /* The return address is the restore PC */
add #-(10*4), r4 /* Skip over r0-r7, mach and macl */
mov.l r15, @-r4
stc.l gbr, @-r4
add #-(7*4), r4 /* Skip over r4, r7-r1. R4 points at R1 storage */
/* Save a nonzero value for R0 in the register save area. This will
* will be the apparent return value when a context switch back to
* this thread is performed.
*/
mov #1, r0 /* Save R0=1 (return value) */
mov.l r0, @-r4
add #-(2*4), r4 /* Skip over mach and macl. R4 points at R15 storage. */
mov.l r15, @-r4 /* SP */
stc.l gbr, @-r4 /* GBR & PR */
sts.l pr, @-r4
mov.l r14, @-r4
mov.l r14, @-r4 /* R14-R8 */
mov.l r13, @-r4
mov.l r12, @-r4
mov.l r11, @-r4