diff options
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/powerpc32/makecontext.S | 8 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S | 6 |
3 files changed, 16 insertions, 4 deletions
@@ -1,5 +1,11 @@ 2013-10-04 Alan Modra <amodra@gmail.com> + * sysdeps/unix/sysv/linux/powerpc/powerpc32/makecontext.S: Use + conditional form of branch and link when obtaining pc. + * sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S: Likewise. + +2013-10-04 Alan Modra <amodra@gmail.com> + * sysdeps/unix/sysv/linux/powerpc/powerpc32/getcontext-common.S: Use HIWORD/LOWORD. * sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext-common.S: Ditto. diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/makecontext.S b/sysdeps/unix/sysv/linux/powerpc/powerpc32/makecontext.S index 95902b13f9..70e3c97626 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/makecontext.S +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/makecontext.S @@ -47,7 +47,9 @@ ENTRY(__makecontext) #ifdef PIC mflr r0 cfi_register(lr,r0) - bl 1f + /* Use this conditional form of branch and link to avoid destroying + the cpu link stack used to predict blr return addresses. */ + bcl 20,31,1f 1: mflr r6 addi r6,r6,L(exitcode)-1b mtlr r0 @@ -136,7 +138,9 @@ ENTRY(__novec_makecontext) #ifdef PIC mflr r0 cfi_register(lr,r0) - bl 1f + /* Use this conditional form of branch and link to avoid destroying + the cpu link stack used to predict blr return addresses. */ + bcl 20,31,1f 1: mflr r6 addi r6,r6,L(novec_exitcode)-1b mtlr r0 diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S b/sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S index 4a16669383..32fc47c3f3 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S @@ -124,8 +124,10 @@ L(noparms): /* If the target function returns we need to do some cleanup. We use a code trick to get the address of our cleanup function into the link - register. Do not add any code between here and L(exitcode). */ - bl L(gotexitcodeaddr); + register. Do not add any code between here and L(exitcode). + Use this conditional form of branch and link to avoid destroying + the cpu link stack used to predict blr return addresses. */ + bcl 20,31,L(gotexitcodeaddr); /* This is the helper code which gets called if a function which is registered with 'makecontext' returns. In this case we |