diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2016-09-16 13:48:17 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-09-19 03:53:55 +0300 |
| commit | 6f698df10cb24d466b9a790b9daedb9e7bcd5d2a (patch) | |
| tree | e357b127a8ce4f76c0b67549b1814aa44994aada /arch/powerpc/include | |
| parent | 03465f899bdac70d34f6ca447a74d8ae9e284ce5 (diff) | |
| download | linux-6f698df10cb24d466b9a790b9daedb9e7bcd5d2a.tar.xz | |
powerpc/kernel: Use kprobe blacklist for asm functions
Rather than forcing the whole function into the ".kprobes.text" section,
just add the symbol's address to the kprobe blacklist.
This also lets us drop the three versions of the_KPROBE macro, in
exchange for just one version of _ASM_NOKPROBE_SYMBOL - which is a good
cleanup.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/ppc_asm.h | 40 |
1 files changed, 14 insertions, 26 deletions
diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h index d5d5b5e348f2..cd39ac127786 100644 --- a/arch/powerpc/include/asm/ppc_asm.h +++ b/arch/powerpc/include/asm/ppc_asm.h @@ -217,13 +217,6 @@ name: \ addi r2,r2,(.TOC.-0b)@l; \ .localentry name,.-name -#define _KPROBE(name) \ - .section ".kprobes.text","a"; \ - .align 2 ; \ - .type name,@function; \ - .globl name; \ -name: - #define DOTSYM(a) a #else @@ -247,20 +240,6 @@ GLUE(.,name): #define _GLOBAL_TOC(name) _GLOBAL(name) -#define _KPROBE(name) \ - .section ".kprobes.text","a"; \ - .align 2 ; \ - .globl name; \ - .globl GLUE(.,name); \ - .section ".opd","aw"; \ -name: \ - .quad GLUE(.,name); \ - .quad .TOC.@tocbase; \ - .quad 0; \ - .previous; \ - .type GLUE(.,name),@function; \ -GLUE(.,name): - #define DOTSYM(a) GLUE(.,a) #endif @@ -279,13 +258,22 @@ n: #define _GLOBAL_TOC(name) _GLOBAL(name) -#define _KPROBE(n) \ - .section ".kprobes.text","a"; \ - .globl n; \ -n: - #endif +/* + * __kprobes (the C annotation) puts the symbol into the .kprobes.text + * section, which gets emitted at the end of regular text. + * + * _ASM_NOKPROBE_SYMBOL and NOKPROBE_SYMBOL just adds the symbol to + * a blacklist. The former is for core kprobe functions/data, the + * latter is for those that incdentially must be excluded from probing + * and allows them to be linked at more optimal location within text. + */ +#define _ASM_NOKPROBE_SYMBOL(entry) \ + .pushsection "_kprobe_blacklist","aw"; \ + PPC_LONG (entry) ; \ + .popsection + #define FUNC_START(name) _GLOBAL(name) #define FUNC_END(name) |