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| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-12-20 16:38:22 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2022-02-07 21:03:11 +1100 |
| commit | d95bf254be5f74c1e4c8f7cb64e2e21b9cc91717 (patch) | |
| tree | a134e521415b985bcb8a10d6159b8da2d8e86df5 /arch/powerpc/kernel/trace/ftrace_32.S | |
| parent | powerpc/ftrace: Simplify PPC32's return_to_handler() (diff) | |
| download | linux-dev-d95bf254be5f74c1e4c8f7cb64e2e21b9cc91717.tar.xz linux-dev-d95bf254be5f74c1e4c8f7cb64e2e21b9cc91717.zip | |
powerpc/ftrace: Prepare PPC32's ftrace_caller() for CONFIG_DYNAMIC_FTRACE_WITH_ARGS
In order to implement CONFIG_DYNAMIC_FTRACE_WITH_ARGS, change
ftrace_caller() stack layout to match struct pt_regs.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/da9734eba504998fb914aca12131c9f6bf6120a8.1640017960.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/trace/ftrace_32.S')
| -rw-r--r-- | arch/powerpc/kernel/trace/ftrace_32.S | 29 |
1 files changed, 25 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/trace/ftrace_32.S b/arch/powerpc/kernel/trace/ftrace_32.S index 95ffea2bdc29..c4055b41af5f 100644 --- a/arch/powerpc/kernel/trace/ftrace_32.S +++ b/arch/powerpc/kernel/trace/ftrace_32.S @@ -27,17 +27,38 @@ _GLOBAL(_mcount) EXPORT_SYMBOL(_mcount) _GLOBAL(ftrace_caller) - MCOUNT_SAVE_FRAME - /* r3 ends up with link register */ + stwu r1, -INT_FRAME_SIZE(r1) + + SAVE_GPRS(3, 10, r1) + + addi r8, r1, INT_FRAME_SIZE + stw r8, GPR1(r1) + + mflr r3 + stw r3, _NIP(r1) subi r3, r3, MCOUNT_INSN_SIZE + + stw r0, _LINK(r1) + mr r4, r0 + lis r5,function_trace_op@ha lwz r5,function_trace_op@l(r5) - li r6, 0 + + addi r6, r1, STACK_FRAME_OVERHEAD .globl ftrace_call ftrace_call: bl ftrace_stub nop - MCOUNT_RESTORE_FRAME + + lwz r3, _NIP(r1) + mtctr r3 + + REST_GPRS(3, 10, r1) + + lwz r0, _LINK(r1) + mtlr r0 + + addi r1, r1, INT_FRAME_SIZE ftrace_caller_common: #ifdef CONFIG_FUNCTION_GRAPH_TRACER .globl ftrace_graph_call |