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a=openpgp-sha256; l=9404; i=aliceryhl@google.com; h=from:subject:message-id; bh=Cb4rNxJT3xYSbs7lcn8KmjxNXUSXpHp+8mMgBPl07Ow=; b=owEBbQKS/ZANAwAKAQRYvu5YxjlGAcsmYgBnDmro2sIwZUs3C4T9FnV5OgpDdk5cLUmOz9YK3 BxB0FrKhz2JAjMEAAEKAB0WIQSDkqKUTWQHCvFIvbIEWL7uWMY5RgUCZw5q6AAKCRAEWL7uWMY5 RhxaD/0UFLcU+mmD+prY1+AHIX5oKNXcvbg72GtKZy4ox9r8pIYDB1tfWbXPhzpUn6nQNbBQbAC 16+kjxxS+ck/h+hN90PsR+LvihzlYuti3jIFSi1P6gxYoFsURUU/YiShIcA6JSsGtQdR6b8ahU9 R+exF2tPG6FO45tMdjgp0ZzJ7vNhIL/ALXko384OskiPEsLjOXzlbHTC5SUdnvEf30bGPBNKdRl jYHiM01N32ZFFKv4ZEDS99YMdTG4HsNfZNreRO39obPegGp9nOx8QkEWHt89St6DsbQXBlmz2dI d2SJihDUV7Hx3FSTgPy+iZGGd5qvxFX3jRUaW3pgHawZqU7Q3Y5l9KqNcIwGSgK/EK5Wh4Rt9Lj coD254pwLTVCxd6Ab+iZXfHJPQWjjIVyxQvhXSpRgA9lmdu7B6q3PVZlWx4tpBHnhbesUQ1mh6r YI1jAJoHU6xPLQdIn0yNZiPedGMiuCZGzUUPFWSWM1wZmWTb43oxrVh9c44Fh0gyGTO71wug66e mpx3NlzePGTYqRiYrlLdzrOQrPME8xCW1t0iLF1zAI5aygOHOEULVZMrUtr8oSH8DNx7SbcevL7 dxhRANKRumMpETX0lX7yELn5oKl/j9l17RJa5Pz5nxc23mj7Xm5JPH3Kg19a+FsXTX2GGAndHmE CS0erbuM7tT9Y0Q== X-Mailer: b4 0.13.0 Message-ID: <20241015-tracepoint-v11-4-cceb65820089@google.com> Subject: [PATCH v11 4/5] jump_label: adjust inline asm to be consistent From: Alice Ryhl To: Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Peter Zijlstra , Josh Poimboeuf , Jason Baron , Ard Biesheuvel , Miguel Ojeda , Alex Gaynor , Wedson Almeida Filho , Boqun Feng , Gary Guo , "=?utf-8?q?Bj=C3=B6rn_Roy_Baron?=" , Benno Lossin , Andreas Hindborg Cc: linux-trace-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, Arnd Bergmann , linux-arch@vger.kernel.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Sean Christopherson , Uros Bizjak , Catalin Marinas , Will Deacon , Marc Zyngier , Oliver Upton , Mark Rutland , Ryan Roberts , Fuad Tabba , linux-arm-kernel@lists.infradead.org, Paul Walmsley , Palmer Dabbelt , Albert Ou , Anup Patel , Andrew Jones , Alexandre Ghiti , Conor Dooley , Samuel Holland , linux-riscv@lists.infradead.org, Huacai Chen , WANG Xuerui , Bibo Mao , Tiezhu Yang , Andrew Morton , Tianrui Zhao , loongarch@lists.linux.dev, Alice Ryhl Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable To avoid duplication of inline asm between C and Rust, we need to import the inline asm from the relevant `jump_label.h` header into Rust. To make that easier, this patch updates the header files to expose the inline asm via a new ARCH_STATIC_BRANCH_ASM macro. The header files are all updated to define a ARCH_STATIC_BRANCH_ASM that takes the same arguments in a consistent order so that Rust can use the same logic for every architecture. Suggested-by: Peter Zijlstra (Intel) Co-developed-by: Miguel Ojeda Signed-off-by: Miguel Ojeda Acked-by: Peter Zijlstra (Intel) Acked-by: Catalin Marinas Signed-off-by: Alice Ryhl --- arch/arm/include/asm/jump_label.h | 14 +++++---- arch/arm64/include/asm/jump_label.h | 20 ++++++++----- arch/loongarch/include/asm/jump_label.h | 16 +++++++---- arch/riscv/include/asm/jump_label.h | 50 ++++++++++++++++++-----------= ---- arch/x86/include/asm/jump_label.h | 35 +++++++++-------------- 5 files changed, 73 insertions(+), 62 deletions(-) diff --git a/arch/arm/include/asm/jump_label.h b/arch/arm/include/asm/jump_= label.h index e4eb54f6cd9f..a35aba7f548c 100644 --- a/arch/arm/include/asm/jump_label.h +++ b/arch/arm/include/asm/jump_label.h @@ -9,13 +9,17 @@ =20 #define JUMP_LABEL_NOP_SIZE 4 =20 +/* This macro is also expanded on the Rust side. */ +#define ARCH_STATIC_BRANCH_ASM(key, label) \ + "1:\n\t" \ + WASM(nop) "\n\t" \ + ".pushsection __jump_table, \"aw\"\n\t" \ + ".word 1b, " label ", " key "\n\t" \ + ".popsection\n\t" \ + static __always_inline bool arch_static_branch(struct static_key *key, boo= l branch) { - asm goto("1:\n\t" - WASM(nop) "\n\t" - ".pushsection __jump_table, \"aw\"\n\t" - ".word 1b, %l[l_yes], %c0\n\t" - ".popsection\n\t" + asm goto(ARCH_STATIC_BRANCH_ASM("%c0", "%l[l_yes]") : : "i" (&((char *)key)[branch]) : : l_yes); =20 return false; diff --git a/arch/arm64/include/asm/jump_label.h b/arch/arm64/include/asm/j= ump_label.h index a0a5bbae7229..424ed421cd97 100644 --- a/arch/arm64/include/asm/jump_label.h +++ b/arch/arm64/include/asm/jump_label.h @@ -19,10 +19,14 @@ #define JUMP_TABLE_ENTRY(key, label) \ ".pushsection __jump_table, \"aw\"\n\t" \ ".align 3\n\t" \ - ".long 1b - ., %l["#label"] - .\n\t" \ - ".quad %c0 - .\n\t" \ - ".popsection\n\t" \ - : : "i"(key) : : label + ".long 1b - ., " label " - .\n\t" \ + ".quad " key " - .\n\t" \ + ".popsection\n\t" + +/* This macro is also expanded on the Rust side. */ +#define ARCH_STATIC_BRANCH_ASM(key, label) \ + "1: nop\n\t" \ + JUMP_TABLE_ENTRY(key, label) =20 static __always_inline bool arch_static_branch(struct static_key * const k= ey, const bool branch) @@ -30,8 +34,8 @@ static __always_inline bool arch_static_branch(struct sta= tic_key * const key, char *k =3D &((char *)key)[branch]; =20 asm goto( - "1: nop \n\t" - JUMP_TABLE_ENTRY(k, l_yes) + ARCH_STATIC_BRANCH_ASM("%c0", "%l[l_yes]") + : : "i"(k) : : l_yes ); =20 return false; @@ -43,9 +47,11 @@ static __always_inline bool arch_static_branch_jump(stru= ct static_key * const ke const bool branch) { char *k =3D &((char *)key)[branch]; + asm goto( "1: b %l[l_yes] \n\t" - JUMP_TABLE_ENTRY(k, l_yes) + JUMP_TABLE_ENTRY("%c0", "%l[l_yes]") + : : "i"(k) : : l_yes ); return false; l_yes: diff --git a/arch/loongarch/include/asm/jump_label.h b/arch/loongarch/inclu= de/asm/jump_label.h index 29acfe3de3fa..8a924bd69d19 100644 --- a/arch/loongarch/include/asm/jump_label.h +++ b/arch/loongarch/include/asm/jump_label.h @@ -13,18 +13,22 @@ =20 #define JUMP_LABEL_NOP_SIZE 4 =20 -#define JUMP_TABLE_ENTRY \ +/* This macro is also expanded on the Rust side. */ +#define JUMP_TABLE_ENTRY(key, label) \ ".pushsection __jump_table, \"aw\" \n\t" \ ".align 3 \n\t" \ - ".long 1b - ., %l[l_yes] - . \n\t" \ - ".quad %0 - . \n\t" \ + ".long 1b - ., " label " - . \n\t" \ + ".quad " key " - . \n\t" \ ".popsection \n\t" =20 +#define ARCH_STATIC_BRANCH_ASM(key, label) \ + "1: nop \n\t" \ + JUMP_TABLE_ENTRY(key, label) + static __always_inline bool arch_static_branch(struct static_key * const k= ey, const bool branch) { asm goto( - "1: nop \n\t" - JUMP_TABLE_ENTRY + ARCH_STATIC_BRANCH_ASM("%0", "%l[l_yes]") : : "i"(&((char *)key)[branch]) : : l_yes); =20 return false; @@ -37,7 +41,7 @@ static __always_inline bool arch_static_branch_jump(struc= t static_key * const ke { asm goto( "1: b %l[l_yes] \n\t" - JUMP_TABLE_ENTRY + JUMP_TABLE_ENTRY("%0", "%l[l_yes]") : : "i"(&((char *)key)[branch]) : : l_yes); =20 return false; diff --git a/arch/riscv/include/asm/jump_label.h b/arch/riscv/include/asm/j= ump_label.h index 1c768d02bd0c..87a71cc6d146 100644 --- a/arch/riscv/include/asm/jump_label.h +++ b/arch/riscv/include/asm/jump_label.h @@ -16,21 +16,28 @@ =20 #define JUMP_LABEL_NOP_SIZE 4 =20 +#define JUMP_TABLE_ENTRY(key, label) \ + ".pushsection __jump_table, \"aw\" \n\t" \ + ".align " RISCV_LGPTR " \n\t" \ + ".long 1b - ., " label " - . \n\t" \ + "" RISCV_PTR " " key " - . \n\t" \ + ".popsection \n\t" + +/* This macro is also expanded on the Rust side. */ +#define ARCH_STATIC_BRANCH_ASM(key, label) \ + " .align 2 \n\t" \ + " .option push \n\t" \ + " .option norelax \n\t" \ + " .option norvc \n\t" \ + "1: nop \n\t" \ + " .option pop \n\t" \ + JUMP_TABLE_ENTRY(key, label) + static __always_inline bool arch_static_branch(struct static_key * const k= ey, const bool branch) { asm goto( - " .align 2 \n\t" - " .option push \n\t" - " .option norelax \n\t" - " .option norvc \n\t" - "1: nop \n\t" - " .option pop \n\t" - " .pushsection __jump_table, \"aw\" \n\t" - " .align " RISCV_LGPTR " \n\t" - " .long 1b - ., %l[label] - . \n\t" - " " RISCV_PTR " %0 - . \n\t" - " .popsection \n\t" + ARCH_STATIC_BRANCH_ASM("%0", "%l[label]") : : "i"(&((char *)key)[branch]) : : label); =20 return false; @@ -38,21 +45,20 @@ static __always_inline bool arch_static_branch(struct s= tatic_key * const key, return true; } =20 +#define ARCH_STATIC_BRANCH_JUMP_ASM(key, label) \ + " .align 2 \n\t" \ + " .option push \n\t" \ + " .option norelax \n\t" \ + " .option norvc \n\t" \ + "1: j " label " \n\t" \ + " .option pop \n\t" \ + JUMP_TABLE_ENTRY(key, label) + static __always_inline bool arch_static_branch_jump(struct static_key * co= nst key, const bool branch) { asm goto( - " .align 2 \n\t" - " .option push \n\t" - " .option norelax \n\t" - " .option norvc \n\t" - "1: j %l[label] \n\t" - " .option pop \n\t" - " .pushsection __jump_table, \"aw\" \n\t" - " .align " RISCV_LGPTR " \n\t" - " .long 1b - ., %l[label] - . \n\t" - " " RISCV_PTR " %0 - . \n\t" - " .popsection \n\t" + ARCH_STATIC_BRANCH_JUMP_ASM("%0", "%l[label]") : : "i"(&((char *)key)[branch]) : : label); =20 return false; diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_= label.h index cbbef32517f0..3f1c1d6c0da1 100644 --- a/arch/x86/include/asm/jump_label.h +++ b/arch/x86/include/asm/jump_label.h @@ -12,35 +12,28 @@ #include #include =20 -#define JUMP_TABLE_ENTRY \ +#define JUMP_TABLE_ENTRY(key, label) \ ".pushsection __jump_table, \"aw\" \n\t" \ _ASM_ALIGN "\n\t" \ ".long 1b - . \n\t" \ - ".long %l[l_yes] - . \n\t" \ - _ASM_PTR "%c0 + %c1 - .\n\t" \ + ".long " label " - . \n\t" \ + _ASM_PTR " " key " - . \n\t" \ ".popsection \n\t" =20 +/* This macro is also expanded on the Rust side. */ #ifdef CONFIG_HAVE_JUMP_LABEL_HACK - -static __always_inline bool arch_static_branch(struct static_key *key, boo= l branch) -{ - asm goto("1:" - "jmp %l[l_yes] # objtool NOPs this \n\t" - JUMP_TABLE_ENTRY - : : "i" (key), "i" (2 | branch) : : l_yes); - - return false; -l_yes: - return true; -} - +#define ARCH_STATIC_BRANCH_ASM(key, label) \ + "1: jmp " label " # objtool NOPs this \n\t" \ + JUMP_TABLE_ENTRY(key " + 2", label) #else /* !CONFIG_HAVE_JUMP_LABEL_HACK */ +#define ARCH_STATIC_BRANCH_ASM(key, label) \ + "1: .byte " __stringify(BYTES_NOP5) "\n\t" \ + JUMP_TABLE_ENTRY(key, label) +#endif /* CONFIG_HAVE_JUMP_LABEL_HACK */ =20 static __always_inline bool arch_static_branch(struct static_key * const k= ey, const bool branch) { - asm goto("1:" - ".byte " __stringify(BYTES_NOP5) "\n\t" - JUMP_TABLE_ENTRY + asm goto(ARCH_STATIC_BRANCH_ASM("%c0 + %c1", "%l[l_yes]") : : "i" (key), "i" (branch) : : l_yes); =20 return false; @@ -48,13 +41,11 @@ static __always_inline bool arch_static_branch(struct s= tatic_key * const key, co return true; } =20 -#endif /* CONFIG_HAVE_JUMP_LABEL_HACK */ - static __always_inline bool arch_static_branch_jump(struct static_key * co= nst key, const bool branch) { asm goto("1:" "jmp %l[l_yes]\n\t" - JUMP_TABLE_ENTRY + JUMP_TABLE_ENTRY("%c0 + %c1", "%l[l_yes]") : : "i" (key), "i" (branch) : : l_yes); =20 return false; --=20 2.47.0.rc1.288.g06298d1525-goog