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f50b45626e
Implement inline static calls:
- Put a 'bl' to the destination function ('b' if tail call)
- Put a 'nop' when the destination function is NULL ('blr' if tail call)
- Put a 'li r3,0' when the destination is the RET0 function and not
a tail call.
If the destination is too far (over the 32Mb limit), go via the
trampoline.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/3dbd0b2ba577c942729235d0211d04a406653d81.1733245362.git.christophe.leroy@csgroup.eu
31 lines
1.1 KiB
C
31 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_STATIC_CALL_H
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#define _ASM_POWERPC_STATIC_CALL_H
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#define __PPC_SCT(name, inst) \
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asm(".pushsection .text, \"ax\" \n" \
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".align 5 \n" \
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".globl " STATIC_CALL_TRAMP_STR(name) " \n" \
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STATIC_CALL_TRAMP_STR(name) ": \n" \
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inst " \n" \
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" lis 12,2f@ha \n" \
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" lwz 12,2f@l(12) \n" \
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" mtctr 12 \n" \
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" bctr \n" \
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"1: li 3, 0 \n" \
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" blr \n" \
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"2: .long 0 \n" \
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".type " STATIC_CALL_TRAMP_STR(name) ", @function \n" \
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".size " STATIC_CALL_TRAMP_STR(name) ", . - " STATIC_CALL_TRAMP_STR(name) " \n" \
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".popsection \n")
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#define PPC_SCT_RET0 20 /* Offset of label 1 */
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#define PPC_SCT_DATA 28 /* Offset of label 2 */
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#define ARCH_DEFINE_STATIC_CALL_TRAMP(name, func) __PPC_SCT(name, "b " #func)
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#define ARCH_DEFINE_STATIC_CALL_NULL_TRAMP(name) __PPC_SCT(name, "blr")
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#define ARCH_DEFINE_STATIC_CALL_RET0_TRAMP(name) __PPC_SCT(name, "b .+20")
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#define CALL_INSN_SIZE 4
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#endif /* _ASM_POWERPC_STATIC_CALL_H */
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