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powerpc: add CFUNC assembly label annotation

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This macro is to be used in assembly where C functions are called.
pcrel addressing mode requires branches to functions with a
localentry value of 1 to have either a trailing nop or @notoc.
This macro permits the latter without changing callers.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Add dummy definitions to fix selftests build]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230408021752.862660-5-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin
2023-04-08 12:17:50 +10:00
committed by Michael Ellerman
parent dc5dac748a
commit 4e991e3c16
15 changed files with 114 additions and 103 deletions
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6
arch/powerpc/kernel/vdso/gettimeofday.S
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@@ -38,7 +38,11 @@
.else
addi r4, r5, VDSO_DATA_OFFSET
.endif
bl DOTSYM(\funct)
#ifdef __powerpc64__
bl CFUNC(DOTSYM(\funct))
#else
bl \funct
#endif
PPC_LL r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1)
#ifdef __powerpc64__
PPC_LL r2, PPC_MIN_STKFRM + STK_GOT(r1)