diff --git a/arch/aarch64/getcontext.S b/arch/aarch64/getcontext.S index 37390a6..5240728 100644 --- a/arch/aarch64/getcontext.S +++ b/arch/aarch64/getcontext.S @@ -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)