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riscv32::swap: fix stack push/pop asm

This commit is contained in:
morgan 2024-05-23 15:30:27 +08:00
parent 3ecbe53f76
commit 53a964a63d
1 changed files with 5 additions and 6 deletions
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11
src/arch/riscv32.rs
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@ -174,9 +174,9 @@ pub unsafe fn swap(arg: usize, new_sp: StackPointer,
# from the stack; unwinder uses them to find the CFA of the caller,
# and so they have to have the correct value immediately after the
# call instruction that invoked the trampoline.
sw fp, -12(sp)
sw ra, -16(sp)
addi sp, sp, -16
sw fp, 4(sp)
sw ra, 0(sp)
.cfi_offset fp, 4
.cfi_offset ra, 0
@ -191,13 +191,12 @@ pub unsafe fn swap(arg: usize, new_sp: StackPointer,
or a1, zero, sp
# Load stack pointer of the new context.
or sp, zero, a2
# Deallocate the 16 bytes
addi sp, sp, 16
# Restore frame pointer and link register of the new context.
# Load frame and instruction pointers of the new context.
lw fp, -12(sp)
lw ra, -16(sp)
lw fp, 4(sp)
lw ra, 0(sp)
addi sp, sp, 16
# Return into the new context.
jr ra