diff options
| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-10-28 14:24:04 +0200 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-11-29 22:49:29 +1100 |
| commit | 7dfbfb87c243cf08bc2b9cc23699ac207b726458 (patch) | |
| tree | 5f9777a60d4fb9baaa913fad98c325ea409bd334 /arch/powerpc/kernel/module_32.c | |
| parent | powerpc/ftrace: Add module_trampoline_target() for PPC32 (diff) | |
| download | linux-dev-7dfbfb87c243cf08bc2b9cc23699ac207b726458.tar.xz linux-dev-7dfbfb87c243cf08bc2b9cc23699ac207b726458.zip | |
powerpc/ftrace: Activate HAVE_DYNAMIC_FTRACE_WITH_REGS on PPC32
Unlike PPC64, PPC32 doesn't require any special compiler option
to get _mcount() call not clobbering registers.
Provide ftrace_regs_caller() and ftrace_regs_call() and activate
HAVE_DYNAMIC_FTRACE_WITH_REGS.
That's heavily copied from ftrace_64_mprofile.S
For the time being leave livepatching aside, it will come with
following patch.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1862dc7719855cc2a4eec80920d94c955877557e.1635423081.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/module_32.c')
| -rw-r--r-- | arch/powerpc/kernel/module_32.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/module_32.c b/arch/powerpc/kernel/module_32.c index 5dedd76346b2..a491ad481d85 100644 --- a/arch/powerpc/kernel/module_32.c +++ b/arch/powerpc/kernel/module_32.c @@ -306,6 +306,14 @@ int module_finalize_ftrace(struct module *module, const Elf_Shdr *sechdrs) if (!module->arch.tramp) return -ENOENT; +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS + module->arch.tramp_regs = do_plt_call(module->core_layout.base, + (unsigned long)ftrace_regs_caller, + sechdrs, module); + if (!module->arch.tramp_regs) + return -ENOENT; +#endif + return 0; } #endif |