http://llvm.org/bugs/show_bug.cgi?id=22819
Bug ID: 22819
Summary: [powerpc] powerpc-linux-gnu accesses memory below the
stack
Product: libraries
Version: 3.6
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: PowerPC
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
powerpc-linux-gnu accesses memory below the stack - please see "-4(1)" below.
This is a nasty one as it only shows up under rare conditions - it was
quite hard to find the real cause of the problem.
$ cat test.c
int foo(int *);
int test(int *a) {
return foo(a) + 1;
}
// EOF
$ clang-3.6.0 -target powerpc-linux-gnu -O2 -Wall -save-temps -c test.c
$ cat test.s
.text
.file "test.bc"
.globl test
.align 2
.type test,@function
test: # @test
# BB#0: # %entry
mflr 0
stw 31, -4(1)
stw 0, 4(1)
stwu 1, -16(1)
mr 31, 1
bl foo
addi 3, 3, 1
addi 1, 1, 16
lwz 0, 4(1)
lwz 31, -4(1)
mtlr 0
blr
.Ltmp0:
.size test, .Ltmp0-test
.ident "clang version 3.6.0 (tags/RELEASE_360/final)"
.section ".note.GNU-stack","",@progbits
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