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sh: fix getcontext implementation

pull/23/head
Ariadne Conill 2020-12-12 05:04:17 +00:00
parent 82f734ab47
commit f9a3f65f5b
2 changed files with 50 additions and 45 deletions
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55
arch/sh/getcontext.S
View File

@ -15,38 +15,41 @@
ALIAS(getcontext, libucontext_getcontext)
FUNC(libucontext_getcontext)
mov #0, r0 /* zero out r0, not preserved per ABI */
mov.l r0, @(REG_OFFSET(0), r4) /* save GPRs r0-r15 */
mov.l r1, @(REG_OFFSET(1), r4)
mov.l r2, @(REG_OFFSET(2), r4)
mov.l r3, @(REG_OFFSET(3), r4)
mov.l r4, @(REG_OFFSET(4), r4)
mov.l r5, @(REG_OFFSET(5), r4)
mov.l r6, @(REG_OFFSET(6), r4)
mov.l r7, @(REG_OFFSET(7), r4)
mov.l r8, @(REG_OFFSET(8), r4)
mov.l r9, @(REG_OFFSET(9), r4)
mov.l r10, @(REG_OFFSET(10), r4)
mov.l r11, @(REG_OFFSET(11), r4)
mov.l r12, @(REG_OFFSET(12), r4)
mov.l r13, @(REG_OFFSET(13), r4)
mov.l r14, @(REG_OFFSET(14), r4)
mov.l r15, @(REG_OFFSET(15), r4)
mov r4, r0 /* move r4 to r0, and increment by REG_OFFSET(REG_MACL) + REG_SZ. */
mov r4, r0 /* move r4 to r0, and increment by REG_OFFSET(REG_MACL) + REG_SZ. */
add #(REG_OFFSET(REG_MACL + 1)), r0
sts.l macl, @-r0 /* save macl/mach registers */
sts.l macl, @-r0 /* save macl/mach registers */
sts.l mach, @-r0
stc.l gbr, @-r0 /* save gbr register */
stc.l gbr, @-r0 /* save gbr register */
movt r1 /* load T-flag into r1 */
mov.l r1, @-r0 /* save T-flag as SR register */
movt r1 /* load T-flag into r1 */
mov.l r1, @-r0 /* save T-flag as SR register */
sts.l pr, @-r0 /* save current PR */
sts.l pr, @-r0 /* save current PR as PC as well */
sts.l pr, @-r0 /* save current PR */
sts.l pr, @-r0 /* save current PR as PC as well */
mov.l r15, @-r0 /* preserve registers backwards, from r15 to r1 */
mov.l r14, @-r0
mov.l r13, @-r0
mov.l r12, @-r0
mov.l r11, @-r0
mov.l r10, @-r0
mov.l r9, @-r0
mov.l r8, @-r0
mov.l r7, @-r0
mov.l r6, @-r0
mov.l r5, @-r0
mov.l r4, @-r0
mov.l r3, @-r0
mov.l r2, @-r0
mov.l r1, @-r0
mov r0, r1
mov #0, r0
mov.l r0, @-r1 /* preserve r0 as explicit zero */
mov #0, r0 /* set return value as zero */
rts
END(libucontext_getcontext)

40
arch/sh/swapcontext.S
View File

@ -15,25 +15,6 @@
ALIAS(swapcontext, libucontext_swapcontext)
FUNC(libucontext_swapcontext)
mov #0, r0 /* zero out r0, not preserved per ABI */
mov.l r0, @(REG_OFFSET(0), r4) /* save GPRs r0-r15 */
mov.l r1, @(REG_OFFSET(1), r4)
mov.l r2, @(REG_OFFSET(2), r4)
mov.l r3, @(REG_OFFSET(3), r4)
mov.l r4, @(REG_OFFSET(4), r4)
mov.l r5, @(REG_OFFSET(5), r4)
mov.l r6, @(REG_OFFSET(6), r4)
mov.l r7, @(REG_OFFSET(7), r4)
mov.l r8, @(REG_OFFSET(8), r4)
mov.l r9, @(REG_OFFSET(9), r4)
mov.l r10, @(REG_OFFSET(10), r4)
mov.l r11, @(REG_OFFSET(11), r4)
mov.l r12, @(REG_OFFSET(12), r4)
mov.l r13, @(REG_OFFSET(13), r4)
mov.l r14, @(REG_OFFSET(14), r4)
mov.l r15, @(REG_OFFSET(15), r4)
mov r4, r0 /* move r4 to r0, and increment by REG_OFFSET(REG_MACL) + REG_SZ. */
add #(REG_OFFSET(REG_MACL + 1)), r0
@ -48,6 +29,27 @@ FUNC(libucontext_swapcontext)
sts.l pr, @-r0 /* save current PR */
sts.l pr, @-r0 /* save current PR as PC as well */
mov.l r15, @-r0 /* preserve registers backwards, from r15 to r1 */
mov.l r14, @-r0
mov.l r13, @-r0
mov.l r12, @-r0
mov.l r11, @-r0
mov.l r10, @-r0
mov.l r9, @-r0
mov.l r8, @-r0
mov.l r7, @-r0
mov.l r6, @-r0
mov.l r5, @-r0
mov.l r4, @-r0
mov.l r3, @-r0
mov.l r2, @-r0
mov.l r1, @-r0
mov r0, r1
mov #0, r0
mov.l r0, @-r1 /* preserve r0 as explicit zero */
mov r5, r0 /* now restore the new context */
add #(REG_OFFSET(REG_PC)), r0 /* restore PR */