s390x: fix clobbering of return values in swapcontext
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@ -1,5 +1,5 @@
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/*
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/*
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* Copyright (c) 2018, 2020 Ariadne Conill <ariadne@dereferenced.org>
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* Copyright (c) 2018, 2020, 2024 Ariadne Conill <ariadne@dereferenced.org>
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*
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* purpose with or without fee is hereby granted, provided that the above
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@ -19,12 +19,14 @@ FUNC(libucontext_swapcontext)
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lgr %r1, %r2 /* use %r1 to save current context to */
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lgr %r1, %r2 /* use %r1 to save current context to */
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lgr %r0, %r3 /* use %r0 for source context */
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lgr %r0, %r3 /* use %r0 for source context */
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la %r2, 0 /* zero out future return value */
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stam %a0, %a15, AREG_OFFSET(0)(%r1) /* store access registers */
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stam %a0, %a15, AREG_OFFSET(0)(%r1) /* store access registers */
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stmg %r0, %r15, REG_OFFSET(0)(%r1) /* store general-purpose registers */
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stmg %r0, %r15, REG_OFFSET(0)(%r1) /* store general-purpose registers */
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lgr %r2, %r0 /* swap %r0 to %r2 (XXX: figure out why it hates loading from %r0) */
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lgr %r5, %r0 /* copy %r0 to %r5 so that %r0 doesn't get clobbered */
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lam %a2, %a15, AREG_OFFSET(2)(%r2) /* load access registers, but skip %a0 and %a1 which are for TLS */
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lam %a2, %a15, AREG_OFFSET(2)(%r5) /* load access registers, but skip %a0 and %a1 which are for TLS */
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lmg %r0, %r15, REG_OFFSET(0)(%r2) /* load general-purpose registers */
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lmg %r0, %r15, REG_OFFSET(0)(%r5) /* load general-purpose registers */
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br %r14 /* return to new link register address */
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br %r14 /* return to new link register address */
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END(libucontext_swapcontext)
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END(libucontext_swapcontext)
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