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| author | Peter Zijlstra <peterz@infradead.org> | 2020-04-22 17:03:22 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-04-30 20:14:34 +0200 |
| commit | ca3f0d80dd57c8828bfb5bc0bc79750ea7a1ba26 (patch) | |
| tree | 610fe8890a2276e3bfa5a93e93c19eca90b30861 /arch/x86/lib | |
| parent | x86/speculation: Change FILL_RETURN_BUFFER to work with objtool (diff) | |
| download | linux-ca3f0d80dd57c8828bfb5bc0bc79750ea7a1ba26.tar.xz linux-ca3f0d80dd57c8828bfb5bc0bc79750ea7a1ba26.zip | |
x86: Simplify retpoline declaration
Because of how KSYM works, we need one declaration per line. Seeing
how we're going to be doubling the amount of retpoline symbols,
simplify the machinery in order to avoid having to copy/paste even
more.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20200428191700.091696925@infradead.org
Diffstat (limited to 'arch/x86/lib')
| -rw-r--r-- | arch/x86/lib/retpoline.S | 37 |
1 files changed, 16 insertions, 21 deletions
diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S index 363ec132df7e..9cc5480300c9 100644 --- a/arch/x86/lib/retpoline.S +++ b/arch/x86/lib/retpoline.S @@ -24,25 +24,20 @@ SYM_FUNC_END(__x86_indirect_thunk_\reg) * only see one instance of "__x86_indirect_thunk_\reg" rather * than one per register with the correct names. So we do it * the simple and nasty way... + * + * Worse, you can only have a single EXPORT_SYMBOL per line, + * and CPP can't insert newlines, so we have to repeat everything + * at least twice. */ -#define __EXPORT_THUNK(sym) _ASM_NOKPROBE(sym); EXPORT_SYMBOL(sym) -#define EXPORT_THUNK(reg) __EXPORT_THUNK(__x86_indirect_thunk_ ## reg) -#define GENERATE_THUNK(reg) THUNK reg ; EXPORT_THUNK(reg) - -GENERATE_THUNK(_ASM_AX) -GENERATE_THUNK(_ASM_BX) -GENERATE_THUNK(_ASM_CX) -GENERATE_THUNK(_ASM_DX) -GENERATE_THUNK(_ASM_SI) -GENERATE_THUNK(_ASM_DI) -GENERATE_THUNK(_ASM_BP) -#ifdef CONFIG_64BIT -GENERATE_THUNK(r8) -GENERATE_THUNK(r9) -GENERATE_THUNK(r10) -GENERATE_THUNK(r11) -GENERATE_THUNK(r12) -GENERATE_THUNK(r13) -GENERATE_THUNK(r14) -GENERATE_THUNK(r15) -#endif + +#define __EXPORT_THUNK(sym) _ASM_NOKPROBE(sym); EXPORT_SYMBOL(sym) +#define EXPORT_THUNK(reg) __EXPORT_THUNK(__x86_indirect_thunk_ ## reg) + +#undef GEN +#define GEN(reg) THUNK reg +#include <asm/GEN-for-each-reg.h> + +#undef GEN +#define GEN(reg) EXPORT_THUNK(reg) +#include <asm/GEN-for-each-reg.h> + |