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- /*
- * 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>
- _GLOBAL_TOC(ftrace_caller)
- lbz r3, PACA_FTRACE_ENABLED(r13)
- cmpdi r3, 0
- beqlr
- /* 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
- #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 */
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