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aarch64: fix return value if getcontext was used to acquire the current context. 

x0 hast to be 0 in case setcontext is called with a context acquired by getcontext.
Thus x0=0 must be stored in getcontext.
master
Volker Christian 2023-09-03 19:57:10 +02:00 committed by Ariadne Conill
parent 9e5de65076
commit 124a962b39
1 changed files with 21 additions and 16 deletions
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37
arch/aarch64/getcontext.S
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@ -22,23 +22,8 @@ ALIAS(__getcontext, libucontext_getcontext)
PROC_NAME(libucontext_getcontext):
str xzr, [x0, #REG_OFFSET(0)]
/* save GPRs */
stp x0, x1, [x0, #REG_OFFSET(0)]
/* save x2 and x3 for reuse */
stp x2, x3, [x0, #REG_OFFSET(2)]
stp x4, x5, [x0, #REG_OFFSET(4)]
stp x6, x7, [x0, #REG_OFFSET(6)]
stp x8, x9, [x0, #REG_OFFSET(8)]
stp x10, x11, [x0, #REG_OFFSET(10)]
stp x12, x13, [x0, #REG_OFFSET(12)]
stp x14, x15, [x0, #REG_OFFSET(14)]
stp x16, x17, [x0, #REG_OFFSET(16)]
stp x18, x19, [x0, #REG_OFFSET(18)]
stp x20, x21, [x0, #REG_OFFSET(20)]
stp x22, x23, [x0, #REG_OFFSET(22)]
stp x24, x25, [x0, #REG_OFFSET(24)]
stp x26, x27, [x0, #REG_OFFSET(26)]
stp x28, x29, [x0, #REG_OFFSET(28)]
str x30, [x0, #REG_OFFSET(30)]
/* save current program counter in link register */
str x30, [x0, #PC_OFFSET]
@ -56,6 +41,26 @@ PROC_NAME(libucontext_getcontext):
stp q12, q13, [x2, #208]
stp q14, q15, [x2, #240]
/* save GPRs and return value 0 */
mov x2, x0
mov x0, #0
stp x0, x1, [x2, #REG_OFFSET(0)]
/* x2 and x3 have already been saved */
stp x4, x5, [x2, #REG_OFFSET(4)]
stp x6, x7, [x2, #REG_OFFSET(6)]
stp x8, x9, [x2, #REG_OFFSET(8)]
stp x10, x11, [x2, #REG_OFFSET(10)]
stp x12, x13, [x2, #REG_OFFSET(12)]
stp x14, x15, [x2, #REG_OFFSET(14)]
stp x16, x17, [x2, #REG_OFFSET(16)]
stp x18, x19, [x2, #REG_OFFSET(18)]
stp x20, x21, [x2, #REG_OFFSET(20)]
stp x22, x23, [x2, #REG_OFFSET(22)]
stp x24, x25, [x2, #REG_OFFSET(24)]
stp x26, x27, [x2, #REG_OFFSET(26)]
stp x28, x29, [x2, #REG_OFFSET(28)]
str x30, [x2, #REG_OFFSET(30)]
ret
END(libucontext_getcontext)