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Some CFI stuff.

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This commit is contained in:
theraven 2011-10-28 22:03:48 +00:00
parent 11d324ae91
commit 8f4041698b
1 changed files with 9 additions and 2 deletions
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11
objc_msgSend.arm.S
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@ -14,10 +14,14 @@
.endm .endm
.macro MSGSEND receiver, sel .macro MSGSEND receiver, sel
.cfi_startproc
teq \receiver, 0 teq \receiver, 0
beq 4f // Skip everything if the receiver is nil beq 4f // Skip everything if the receiver is nil
push {r4-r6} // We're going to use these three as push {r4-r6} // We're going to use these three as
// scratch registers, so save them now .cfi_adjust_cfa_offset 12 // scratch registers, so save them now.
.cfi_rel_offset r4, 0 // These are callee-save, so the unwind library
.cfi_rel_offset r5, 4 // must be able to restore them, so we need CFI
.cfi_rel_offset r6, 8 // directives for them, but not for any other pushes
tst \receiver, SMALLOBJ_MASK // Sets Z if this is not a small int tst \receiver, SMALLOBJ_MASK // Sets Z if this is not a small int
@ -74,13 +78,16 @@
push {\receiver} // &self, _cmd in arguments push {\receiver} // &self, _cmd in arguments
mov r0, sp mov r0, sp
mov r1, \sel mov r1, \sel
bl slowMsgLookup(PLT)
.cfi_adjust_cfa_offset 24 // pushed 6 more 4-byte words onto the stack.
bl slowMsgLookup(PLT) // This is the only place where the CFI directives have to be accurate...
mov ip, r0 // IMP -> ip mov ip, r0 // IMP -> ip
pop {r5} // restore (modified) self to r5 pop {r5} // restore (modified) self to r5
pop {r0-r3, lr} // Load clobbered registers pop {r0-r3, lr} // Load clobbered registers
mov \receiver, r5 mov \receiver, r5
b 3b b 3b
.cfi_endproc
.endm .endm
.globl objc_msgSend .globl objc_msgSend