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add unwind information on morestack

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ILyoan 2013-03-19 14:28:10 +09:00 • committed by Brian Anderson
parent a34948a2c5
commit 03116f251d
1 changed files with 19 additions and 14 deletions
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33
src/rt/arch/arm/morestack.S
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@ -15,14 +15,19 @@
// r4 and r5 are scratch registers for __morestack due to llvm
// ARMFrameLowering::adjustForSegmentedStacks() implementation.
.align 2
.type __morestack,%function
.type __morestack,%function
__morestack:
.fnstart
// Save frame pointer and return address
.save {r4, r5}
.save {lr}
.save {r6, fp, lr}
push {r6, fp, lr}
// Save frame pointer and return address
push {fp, lr}
mov fp, sp
.movsp r6
mov r6, sp
.setfp fp, sp, #4
add fp, sp, #4
// Save argument registers of the original function
push {r0, r1, r2, r3, lr}
@ -47,20 +52,20 @@ __morestack:
mov pc, r4 // Call the original function
// Switch back to rust stack
mov sp, fp
mov sp, r6
// Save return value
push {r0, r1}
mov r4, r0
mov r5, r1
// Remove the new allocated stack
bl upcall_del_stack@plt
// Restore return value
pop {r0, r1}
mov r0, r4
mov r1, r5
// Return
pop {fp, lr}
pop {r6, fp, lr}
mov pc, lr
.endofmorestack:
.size __morestack, .endofmorestack-__morestack
.fnend