diff options
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 41 |
1 files changed, 16 insertions, 25 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 5bbd1bc8c3b0..194e46dcf08d 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -659,7 +659,13 @@ _GLOBAL(ret_from_except_lite) 3: #endif bl save_nvgprs + /* + * Use a non volatile GPR to save and restore our thread_info flags + * across the call to restore_interrupts. + */ + mr r30,r4 bl restore_interrupts + mr r4,r30 addi r3,r1,STACK_FRAME_OVERHEAD bl do_notify_resume b ret_from_except @@ -1221,13 +1227,20 @@ _GLOBAL(ftrace_graph_caller) ld r4, 128(r1) subi r4, r4, MCOUNT_INSN_SIZE - /* get the parent address */ + /* Grab the LR out of the caller stack frame */ ld r11, 112(r1) - addi r3, r11, 16 + ld r3, 16(r11) bl prepare_ftrace_return nop + /* + * prepare_ftrace_return gives us the address we divert to. + * Change the LR in the callers stack frame to this. + */ + ld r11, 112(r1) + std r3, 16(r11) + ld r0, 128(r1) mtlr r0 addi r1, r1, 112 @@ -1235,28 +1248,6 @@ _GLOBAL(ftrace_graph_caller) _GLOBAL(return_to_handler) /* need to save return values */ - std r4, -24(r1) - std r3, -16(r1) - std r31, -8(r1) - mr r31, r1 - stdu r1, -112(r1) - - bl ftrace_return_to_handler - nop - - /* return value has real return address */ - mtlr r3 - - ld r1, 0(r1) - ld r4, -24(r1) - ld r3, -16(r1) - ld r31, -8(r1) - - /* Jump back to real return address */ - blr - -_GLOBAL(mod_return_to_handler) - /* need to save return values */ std r4, -32(r1) std r3, -24(r1) /* save TOC */ @@ -1266,7 +1257,7 @@ _GLOBAL(mod_return_to_handler) stdu r1, -112(r1) /* - * We are in a module using the module's TOC. + * We might be called from a module. * Switch to our TOC to run inside the core kernel. */ ld r2, PACATOC(r13) |