LXR linux/arch/powerpc/kernel/trace/ftrace_64

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * Split from ftrace_64.S
   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
  13_GLOBAL_TOC(ftrace_caller)
  14        lbz     r3, PACA_FTRACE_ENABLED(r13)
  15        cmpdi   r3, 0
  16        beqlr
  17
  18        /* Taken from output of objdump from lib64/glibc */
  19        mflr    r3
  20        ld      r11, 0(r1)
  21        stdu    r1, -112(r1)
  22        std     r3, 128(r1)
  23        ld      r4, 16(r11)
  24        subi    r3, r3, MCOUNT_INSN_SIZE
  25.globl ftrace_call
  26ftrace_call:
  27        bl      ftrace_stub
  28        nop
  29#ifdef CONFIG_FUNCTION_GRAPH_TRACER
  30.globl ftrace_graph_call
  31ftrace_graph_call:
  32        b       ftrace_graph_stub
  33_GLOBAL(ftrace_graph_stub)
  34#endif
  35        ld      r0, 128(r1)
  36        mtlr    r0
  37        addi    r1, r1, 112
  38
  39_GLOBAL(ftrace_stub)
  40        blr
  41
  42#ifdef CONFIG_FUNCTION_GRAPH_TRACER
  43_GLOBAL(ftrace_graph_caller)
  44        addi    r5, r1, 112
  45        /* load r4 with local address */
  46        ld      r4, 128(r1)
  47        subi    r4, r4, MCOUNT_INSN_SIZE
  48
  49        /* Grab the LR out of the caller stack frame */
  50        ld      r11, 112(r1)
  51        ld      r3, 16(r11)
  52
  53        bl      prepare_ftrace_return
  54        nop
  55
  56        /*
  57         * prepare_ftrace_return gives us the address we divert to.
  58         * Change the LR in the callers stack frame to this.
  59         */
  60        ld      r11, 112(r1)
  61        std     r3, 16(r11)
  62
  63        ld      r0, 128(r1)
  64        mtlr    r0
  65        addi    r1, r1, 112
  66        blr
  67#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
  68