| /* SPDX-License-Identifier: GPL-2.0-or-later */ | |
| /* | |
| * Split from entry_64.S | |
| */ | |
| #include <linux/magic.h> | |
| #include <asm/ppc_asm.h> | |
| #include <asm/asm-offsets.h> | |
| #include <asm/ftrace.h> | |
| #include <asm/ppc-opcode.h> | |
| #include <asm/export.h> | |
| .pushsection ".tramp.ftrace.text","aw",@progbits; | |
| .globl ftrace_tramp_text | |
| ftrace_tramp_text: | |
| .space 64 | |
| .popsection | |
| .pushsection ".tramp.ftrace.init","aw",@progbits; | |
| .globl ftrace_tramp_init | |
| ftrace_tramp_init: | |
| .space 64 | |
| .popsection | |
| _GLOBAL(mcount) | |
| _GLOBAL(_mcount) | |
| EXPORT_SYMBOL(_mcount) | |
| mflr r12 | |
| mtctr r12 | |
| mtlr r0 | |
| bctr | |
| #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
| _GLOBAL(return_to_handler) | |
| /* need to save return values */ | |
| std r4, -32(r1) | |
| std r3, -24(r1) | |
| /* save TOC */ | |
| std r2, -16(r1) | |
| std r31, -8(r1) | |
| mr r31, r1 | |
| stdu r1, -112(r1) | |
| /* | |
| * We might be called from a module. | |
| * Switch to our TOC to run inside the core kernel. | |
| */ | |
| ld r2, PACATOC(r13) | |
| bl ftrace_return_to_handler | |
| nop | |
| /* return value has real return address */ | |
| mtlr r3 | |
| ld r1, 0(r1) | |
| ld r4, -32(r1) | |
| ld r3, -24(r1) | |
| ld r2, -16(r1) | |
| ld r31, -8(r1) | |
| /* Jump back to real return address */ | |
| blr | |
| #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |