Add build option to disable usage of scv on powerpc

[platform/upstream/glibc.git] / sysdeps / unix / sysv / linux / powerpc / powerpc64 / clone.S

diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S b/sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S
index e9bd8cb..777ead8 100644 (file)
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S
@@ -38,11 +38,13 @@ ENTRY (__clone)
        beq-    cr0,L(badargs)
 
        /* Save some regs in the "red zone".  */
+#ifdef USE_PPC_SCV
        std     r28,-32(r1)
+       cfi_offset(r28,-32)
+#endif
        std     r29,-24(r1)
        std     r30,-16(r1)
        std     r31,-8(r1)
-       cfi_offset(r28,-32)
        cfi_offset(r29,-24)
        cfi_offset(r30,-16)
        cfi_offset(r31,-8)
@@ -71,6 +73,7 @@ ENTRY (__clone)
 
        /* Do the call.  */
        li      r0,SYS_ify(clone)
+#ifdef USE_PPC_SCV
        CHECK_SCV_SUPPORT r28 0f
        /* This is equivalent to DO_CALL_SCV, but we cannot use the macro here
        because it uses CFI directives and we just called cfi_endproc.  */
@@ -87,6 +90,7 @@ ENTRY (__clone)
        /* When using scv, error is indicated by negative r3.  */
        cmpdi   cr1,r3,0
        b 1f
+#endif /* USE_PPC_SCV */
 0:      DO_CALL_SC
 
        /* Check for child process.  */
@@ -119,22 +123,26 @@ L(parent):
        cmpdi cr1,r28,0
 
        /* Parent.  Restore registers & return.  */
+#ifdef USE_PPC_SCV
        cfi_offset(r28,-32)
+       ld      r28,-32(r1)
+       cfi_restore(r28)
+#endif
        cfi_offset(r29,-24)
        cfi_offset(r30,-16)
        cfi_offset(r31,-8)
-       ld      r28,-32(r1)
        ld      r29,-24(r1)
        ld      r30,-16(r1)
        ld      r31,-8(r1)
-       cfi_restore(r28)
        cfi_restore(r29)
        cfi_restore(r30)
        cfi_restore(r31)
 
+#ifdef USE_PPC_SCV
        beq cr1,0f
        RET_SCV
        b 1f
+#endif
 0:     RET_SC
 1:     TAIL_CALL_SYSCALL_ERROR