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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
commite5fd91f1ef340da553f7a79da9540c3db711c937 (patch)
treeb11842027dc6641da63f4bcc524f8678263304a3 /arch/powerpc/kernel/exceptions-64s.S
parent2a9b0348e685a63d97486f6749622b61e9e3292f (diff)
Linux-libre 4.2-gnu
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64s.S')
-rw-r--r--arch/powerpc/kernel/exceptions-64s.S16
1 files changed, 4 insertions, 12 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 9519e6bdc..0a0399c2a 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -59,14 +59,13 @@ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \
#if defined(CONFIG_RELOCATABLE)
/*
- * We can't branch directly; in the direct case we use LR
- * and system_call_entry restores LR. (We thus need to move
- * LR to r10 in the RFID case too.)
+ * We can't branch directly so we do it via the CTR which
+ * is volatile across system calls.
*/
#define SYSCALL_PSERIES_2_DIRECT \
mflr r10 ; \
ld r12,PACAKBASE(r13) ; \
- LOAD_HANDLER(r12, system_call_entry_direct) ; \
+ LOAD_HANDLER(r12, system_call_entry) ; \
mtctr r12 ; \
mfspr r12,SPRN_SRR1 ; \
/* Re-use of r13... No spare regs to do this */ \
@@ -80,7 +79,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \
mfspr r12,SPRN_SRR1 ; \
li r10,MSR_RI ; \
mtmsrd r10,1 ; /* Set RI (EE=0) */ \
- b system_call_entry_direct ;
+ b system_call_common ;
#endif
/*
@@ -969,13 +968,6 @@ hv_facility_unavailable_relon_trampoline:
__end_interrupts:
.align 7
-system_call_entry_direct:
-#if defined(CONFIG_RELOCATABLE)
- /* The first level prologue may have used LR to get here, saving
- * orig in r10. To save hacking/ifdeffing common code, restore here.
- */
- mtlr r10
-#endif
system_call_entry:
b system_call_common