| /* | |
| * Split from ftrace_64.S | |
| * | |
| * This program is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU General Public License | |
| * as published by the Free Software Foundation; either version | |
| * 2 of the License, or (at your option) any later version. | |
| */ | |
| #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> | |
| #ifdef CONFIG_DYNAMIC_FTRACE | |
| _GLOBAL_TOC(ftrace_caller) | |
| /* Taken from output of objdump from lib64/glibc */ | |
| mflr r3 | |
| ld r11, 0(r1) | |
| stdu r1, -112(r1) | |
| std r3, 128(r1) | |
| ld r4, 16(r11) | |
| subi r3, r3, MCOUNT_INSN_SIZE | |
| .globl ftrace_call | |
| ftrace_call: | |
| bl ftrace_stub | |
| nop | |
| #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
| .globl ftrace_graph_call | |
| ftrace_graph_call: | |
| b ftrace_graph_stub | |
| _GLOBAL(ftrace_graph_stub) | |
| #endif | |
| ld r0, 128(r1) | |
| mtlr r0 | |
| addi r1, r1, 112 | |
| _GLOBAL(ftrace_stub) | |
| blr | |
| #endif /* CONFIG_DYNAMIC_FTRACE */ | |
| #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
| _GLOBAL(ftrace_graph_caller) | |
| /* load r4 with local address */ | |
| ld r4, 128(r1) | |
| subi r4, r4, MCOUNT_INSN_SIZE | |
| /* Grab the LR out of the caller stack frame */ | |
| ld r11, 112(r1) | |
| 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 | |
| blr | |
| #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |