diff options
| author | Alex Shi <alex.shi@linaro.org> | 2016-05-12 09:27:18 +0800 |
|---|---|---|
| committer | Alex Shi <alex.shi@linaro.org> | 2016-05-12 09:27:18 +0800 |
| commit | 334ca3ed18ded942e0220719f70b80eb20fa48ec (patch) | |
| tree | 16e6d4a8342db2ff94505cb0dba60cd2fa1587bf /arch/arm64/include/asm/assembler.h | |
| parent | bab15641824ad77e5f3af9cc4b84308cba32aa7d (diff) | |
| parent | 9ba733e2628196c5f211875122c8fc6de108c19e (diff) | |
Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android
Diffstat (limited to 'arch/arm64/include/asm/assembler.h')
| -rw-r--r-- | arch/arm64/include/asm/assembler.h | 37 |
1 files changed, 33 insertions, 4 deletions
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h index 12eff928ef8b..70f7b9e04598 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -94,12 +94,19 @@ dmb \opt .endm +/* + * Emit an entry into the exception table + */ + .macro _asm_extable, from, to + .pushsection __ex_table, "a" + .align 3 + .long (\from - .), (\to - .) + .popsection + .endm + #define USER(l, x...) \ 9999: x; \ - .section __ex_table,"a"; \ - .align 3; \ - .quad 9999b,l; \ - .previous + _asm_extable 9999b, l /* * Register aliases. @@ -193,6 +200,17 @@ lr .req x30 // link register str \src, [\tmp, :lo12:\sym] .endm + /* + * @sym: The name of the per-cpu variable + * @reg: Result of per_cpu(sym, smp_processor_id()) + * @tmp: scratch register + */ + .macro this_cpu_ptr, sym, reg, tmp + adr_l \reg, \sym + mrs \tmp, tpidr_el1 + add \reg, \reg, \tmp + .endm + /* * Annotate a function as position independent, i.e., safe to be called before * the kernel virtual mapping is activated. @@ -204,4 +222,15 @@ lr .req x30 // link register .size __pi_##x, . - x; \ ENDPROC(x) + /* + * Emit a 64-bit absolute little endian symbol reference in a way that + * ensures that it will be resolved at build time, even when building a + * PIE binary. This requires cooperation from the linker script, which + * must emit the lo32/hi32 halves individually. + */ + .macro le64sym, sym + .long \sym\()_lo32 + .long \sym\()_hi32 + .endm + #endif /* __ASM_ASSEMBLER_H */ |