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[bpf-next,v4,05/10] arm64: insn: Add BIT(23) to {load,store}_ex's mask

Message ID 03ceb882fa759f503b3f4b7f4ff2a5ce69a0eb05.1740978603.git.yepeilin@google.com (mailing list archive)
State New
Headers show
Series Introduce load-acquire and store-release BPF instructions | expand

Commit Message

Peilin Ye March 3, 2025, 5:37 a.m. UTC 
We are planning to add load-acquire (LDAR{,B,H}) and store-release
(STLR{,B,H}) instructions to insn.{c,h}; add BIT(23) to mask of load_ex
and store_ex to prevent aarch64_insn_is_{load,store}_ex() from returning
false-positives for load-acquire and store-release instructions.

Reference: Arm Architecture Reference Manual (ARM DDI 0487K.a,
           ID032224),

  * C6.2.228 LDXR
  * C6.2.165 LDAXR
  * C6.2.161 LDAR
  * C6.2.393 STXR
  * C6.2.360 STLXR
  * C6.2.353 STLR

Acked-by: Xu Kuohai <xukuohai@huawei.com>
Signed-off-by: Peilin Ye <yepeilin@google.com>
---
 arch/arm64/include/asm/insn.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h
index e390c432f546..2d8316b3abaf 100644
--- a/arch/arm64/include/asm/insn.h
+++ b/arch/arm64/include/asm/insn.h
@@ -351,8 +351,8 @@  __AARCH64_INSN_FUNCS(ldr_imm,	0x3FC00000, 0x39400000)
 __AARCH64_INSN_FUNCS(ldr_lit,	0xBF000000, 0x18000000)
 __AARCH64_INSN_FUNCS(ldrsw_lit,	0xFF000000, 0x98000000)
 __AARCH64_INSN_FUNCS(exclusive,	0x3F800000, 0x08000000)
-__AARCH64_INSN_FUNCS(load_ex,	0x3F400000, 0x08400000)
-__AARCH64_INSN_FUNCS(store_ex,	0x3F400000, 0x08000000)
+__AARCH64_INSN_FUNCS(load_ex,	0x3FC00000, 0x08400000)
+__AARCH64_INSN_FUNCS(store_ex,	0x3FC00000, 0x08000000)
 __AARCH64_INSN_FUNCS(mops,	0x3B200C00, 0x19000400)
 __AARCH64_INSN_FUNCS(stp,	0x7FC00000, 0x29000000)
 __AARCH64_INSN_FUNCS(ldp,	0x7FC00000, 0x29400000)