projects / mirror_ubuntu-kernels.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 7853f9c0 NR |
2 | /* |
| 3 | * Split from entry_64.S | |
| 7853f9c0 NR |
4 | */ |
| 5 | ||
| 6 | #include <linux/magic.h> | |
| 7 | #include <asm/ppc_asm.h> | |
| 8 | #include <asm/asm-offsets.h> | |
| 9 | #include <asm/ftrace.h> | |
| 10 | #include <asm/ppc-opcode.h> | |
| 11 | #include <asm/export.h> | |
| 12 | ||
| 67361cf8 NR |
13 | .pushsection ".tramp.ftrace.text","aw",@progbits; |
| 14 | .globl ftrace_tramp_text | |
| 15 | ftrace_tramp_text: | |
| 16 | .space 64 | |
| 17 | .popsection | |
| 18 | ||
| 19 | .pushsection ".tramp.ftrace.init","aw",@progbits; | |
| 20 | .globl ftrace_tramp_init | |
| 21 | ftrace_tramp_init: | |
| 22 | .space 64 | |
| 23 | .popsection | |
| 24 | ||
| 7853f9c0 NR |
25 | _GLOBAL(mcount) |
| 26 | _GLOBAL(_mcount) | |
| 27 | EXPORT_SYMBOL(_mcount) | |
| 28 | mflr r12 | |
| 29 | mtctr r12 | |
| 30 | mtlr r0 | |
| 31 | bctr | |
| 32 | ||
| 7853f9c0 | 33 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 7853f9c0 NR |
34 | _GLOBAL(return_to_handler) |
| 35 | /* need to save return values */ | |
| 36 | std r4, -32(r1) | |
| 37 | std r3, -24(r1) | |
| 38 | /* save TOC */ | |
| 39 | std r2, -16(r1) | |
| 40 | std r31, -8(r1) | |
| 41 | mr r31, r1 | |
| 42 | stdu r1, -112(r1) | |
| 43 | ||
| 44 | /* | |
| 45 | * We might be called from a module. | |
| 46 | * Switch to our TOC to run inside the core kernel. | |
| 47 | */ | |
| 48 | ld r2, PACATOC(r13) | |
| 49 | ||
| 50 | bl ftrace_return_to_handler | |
| 51 | nop | |
| 52 | ||
| 53 | /* return value has real return address */ | |
| 54 | mtlr r3 | |
| 55 | ||
| 56 | ld r1, 0(r1) | |
| 57 | ld r4, -32(r1) | |
| 58 | ld r3, -24(r1) | |
| 59 | ld r2, -16(r1) | |
| 60 | ld r31, -8(r1) | |
| 61 | ||
| 62 | /* Jump back to real return address */ | |
| 63 | blr | |
| 64 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |