* [PATCH 0/3] x86/asm: macro improvements in <asm/asm.h>
@ 2021-05-10 9:09 H. Peter Anvin
2021-05-10 9:09 ` [PATCH 1/3] x86/asm: have the __ASM_FORM macros handle commas in arguments H. Peter Anvin
` (2 more replies)
0 siblings, 3 replies; 7+ messages in thread
From: H. Peter Anvin @ 2021-05-10 9:09 UTC (permalink / raw)
To: Ingo Molnar, Thomas Gleixner, Borislav Petkov, Peter Zijlstra
Cc: Linux Kernel Mailing List, H. Peter Anvin
From: "H. Peter Anvin (Intel)" <hpa@zytor.com>
This patchset adds the following improvements to <asm/asm.h>:
1. Makes the __ASM_FORM() macros accept arguments with commas. This allows
the __ASM_FORM() macros to be used directly in header files for
macros that can be used from either C or assembly, even for
instructions that have multiple operands.
2. Add an _ASM_BYTES() macro for the delicate job of hand-crafting
instructions out of bytes.
3. Replace the _ASM_MK_NOPS() macro in <asm/nops.h> with _ASM_BYTES().
The change to the tools/ directory is mainly because <asm/nops.h> now
depends on <asm/asm.h>.
---
arch/x86/include/asm/asm.h | 23 ++---
arch/x86/include/asm/nops.h | 24 ++---
tools/arch/x86/include/asm/asm.h | 189 ++++++++++++++++++++++++++++++++++++++
tools/arch/x86/include/asm/nops.h | 24 ++---
4 files changed, 221 insertions(+), 39 deletions(-)
^ permalink raw reply [flat|nested] 7+ messages in thread* [PATCH 1/3] x86/asm: have the __ASM_FORM macros handle commas in arguments 2021-05-10 9:09 [PATCH 0/3] x86/asm: macro improvements in <asm/asm.h> H. Peter Anvin @ 2021-05-10 9:09 ` H. Peter Anvin 2021-05-10 10:59 ` [tip: x86/asm] x86/asm: Have " tip-bot2 for H. Peter Anvin (Intel) 2021-05-10 9:09 ` [PATCH 2/3] x86/asm: add _ASM_BYTES() macro for a .byte ... opcode sequence H. Peter Anvin 2021-05-10 9:09 ` [PATCH 3/3] x86/asm: use _ASM_BYTES() in <asm/nops.h> H. Peter Anvin 2 siblings, 1 reply; 7+ messages in thread From: H. Peter Anvin @ 2021-05-10 9:09 UTC (permalink / raw) To: Ingo Molnar, Thomas Gleixner, Borislav Petkov, Peter Zijlstra Cc: Linux Kernel Mailing List, H. Peter Anvin From: "H. Peter Anvin (Intel)" <hpa@zytor.com> The __ASM_FORM macros are really useful, but in order to be able to use them to define instructions via .byte directives breaks because of the necessary commas. Change the macros to handle commas correctly. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> --- arch/x86/include/asm/asm.h | 21 ++++++++++----------- 1 file changed, 10 insertions(+), 11 deletions(-) diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h index 0603c7423aca..c80899ac0192 100644 --- a/arch/x86/include/asm/asm.h +++ b/arch/x86/include/asm/asm.h @@ -3,25 +3,24 @@ #define _ASM_X86_ASM_H #ifdef __ASSEMBLY__ -# define __ASM_FORM(x) x -# define __ASM_FORM_RAW(x) x -# define __ASM_FORM_COMMA(x) x, +# define __ASM_FORM(x, ...) x,## __VA_ARGS__ +# define __ASM_FORM_RAW(x, ...) x,## __VA_ARGS__ +# define __ASM_FORM_COMMA(x, ...) x,## __VA_ARGS__, #else #include <linux/stringify.h> - -# define __ASM_FORM(x) " " __stringify(x) " " -# define __ASM_FORM_RAW(x) __stringify(x) -# define __ASM_FORM_COMMA(x) " " __stringify(x) "," +# define __ASM_FORM(x, ...) " " __stringify(x,##__VA_ARGS__) " " +# define __ASM_FORM_RAW(x, ...) __stringify(x,##__VA_ARGS__) +# define __ASM_FORM_COMMA(x, ...) " " __stringify(x,##__VA_ARGS__) "," #endif #ifndef __x86_64__ /* 32 bit */ -# define __ASM_SEL(a,b) __ASM_FORM(a) -# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a) +# define __ASM_SEL(a,b) __ASM_FORM(a) +# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a) #else /* 64 bit */ -# define __ASM_SEL(a,b) __ASM_FORM(b) -# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b) +# define __ASM_SEL(a,b) __ASM_FORM(b) +# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b) #endif #define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \ -- 2.31.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [tip: x86/asm] x86/asm: Have the __ASM_FORM macros handle commas in arguments 2021-05-10 9:09 ` [PATCH 1/3] x86/asm: have the __ASM_FORM macros handle commas in arguments H. Peter Anvin @ 2021-05-10 10:59 ` tip-bot2 for H. Peter Anvin (Intel) 0 siblings, 0 replies; 7+ messages in thread From: tip-bot2 for H. Peter Anvin (Intel) @ 2021-05-10 10:59 UTC (permalink / raw) To: linux-tip-commits; +Cc: H. Peter Anvin (Intel), Ingo Molnar, x86, linux-kernel The following commit has been merged into the x86/asm branch of tip: Commit-ID: be5bb8021c9731f5593de6419ae35d3f16a3e497 Gitweb: https://git.kernel.org/tip/be5bb8021c9731f5593de6419ae35d3f16a3e497 Author: H. Peter Anvin (Intel) <hpa@zytor.com> AuthorDate: Mon, 10 May 2021 02:09:38 -07:00 Committer: Ingo Molnar <mingo@kernel.org> CommitterDate: Mon, 10 May 2021 12:33:28 +02:00 x86/asm: Have the __ASM_FORM macros handle commas in arguments The __ASM_FORM macros are really useful, but in order to be able to use them to define instructions via .byte directives breaks because of the necessary commas. Change the macros to handle commas correctly. [ mingo: Removed stray whitespaces & aligned the definitions vertically. ] Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20210510090940.924953-2-hpa@zytor.com --- arch/x86/include/asm/asm.h | 21 ++++++++++----------- 1 file changed, 10 insertions(+), 11 deletions(-) diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h index 0603c74..93aad0b 100644 --- a/arch/x86/include/asm/asm.h +++ b/arch/x86/include/asm/asm.h @@ -3,25 +3,24 @@ #define _ASM_X86_ASM_H #ifdef __ASSEMBLY__ -# define __ASM_FORM(x) x -# define __ASM_FORM_RAW(x) x -# define __ASM_FORM_COMMA(x) x, +# define __ASM_FORM(x, ...) x,## __VA_ARGS__ +# define __ASM_FORM_RAW(x, ...) x,## __VA_ARGS__ +# define __ASM_FORM_COMMA(x, ...) x,## __VA_ARGS__, #else #include <linux/stringify.h> - -# define __ASM_FORM(x) " " __stringify(x) " " -# define __ASM_FORM_RAW(x) __stringify(x) -# define __ASM_FORM_COMMA(x) " " __stringify(x) "," +# define __ASM_FORM(x, ...) " " __stringify(x,##__VA_ARGS__) " " +# define __ASM_FORM_RAW(x, ...) __stringify(x,##__VA_ARGS__) +# define __ASM_FORM_COMMA(x, ...) " " __stringify(x,##__VA_ARGS__) "," #endif #ifndef __x86_64__ /* 32 bit */ -# define __ASM_SEL(a,b) __ASM_FORM(a) -# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a) +# define __ASM_SEL(a,b) __ASM_FORM(a) +# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a) #else /* 64 bit */ -# define __ASM_SEL(a,b) __ASM_FORM(b) -# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b) +# define __ASM_SEL(a,b) __ASM_FORM(b) +# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b) #endif #define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \ ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH 2/3] x86/asm: add _ASM_BYTES() macro for a .byte ... opcode sequence 2021-05-10 9:09 [PATCH 0/3] x86/asm: macro improvements in <asm/asm.h> H. Peter Anvin 2021-05-10 9:09 ` [PATCH 1/3] x86/asm: have the __ASM_FORM macros handle commas in arguments H. Peter Anvin @ 2021-05-10 9:09 ` H. Peter Anvin 2021-05-10 10:59 ` [tip: x86/asm] x86/asm: Add " tip-bot2 for H. Peter Anvin (Intel) 2021-05-10 9:09 ` [PATCH 3/3] x86/asm: use _ASM_BYTES() in <asm/nops.h> H. Peter Anvin 2 siblings, 1 reply; 7+ messages in thread From: H. Peter Anvin @ 2021-05-10 9:09 UTC (permalink / raw) To: Ingo Molnar, Thomas Gleixner, Borislav Petkov, Peter Zijlstra Cc: Linux Kernel Mailing List, H. Peter Anvin From: "H. Peter Anvin (Intel)" <hpa@zytor.com> Make it easy to create a sequence of bytes that can be used in either assembly proper on in a C asm() statement. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> --- arch/x86/include/asm/asm.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h index c80899ac0192..1a1e22297867 100644 --- a/arch/x86/include/asm/asm.h +++ b/arch/x86/include/asm/asm.h @@ -13,6 +13,8 @@ # define __ASM_FORM_COMMA(x, ...) " " __stringify(x,##__VA_ARGS__) "," #endif +#define _ASM_BYTES(x, ...) __ASM_FORM(.byte x,##__VA_ARGS__ ;) + #ifndef __x86_64__ /* 32 bit */ # define __ASM_SEL(a,b) __ASM_FORM(a) -- 2.31.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [tip: x86/asm] x86/asm: Add _ASM_BYTES() macro for a .byte ... opcode sequence 2021-05-10 9:09 ` [PATCH 2/3] x86/asm: add _ASM_BYTES() macro for a .byte ... opcode sequence H. Peter Anvin @ 2021-05-10 10:59 ` tip-bot2 for H. Peter Anvin (Intel) 0 siblings, 0 replies; 7+ messages in thread From: tip-bot2 for H. Peter Anvin (Intel) @ 2021-05-10 10:59 UTC (permalink / raw) To: linux-tip-commits; +Cc: H. Peter Anvin (Intel), Ingo Molnar, x86, linux-kernel The following commit has been merged into the x86/asm branch of tip: Commit-ID: d88be187a6e6f3a97dfa7ddc500bb9ca191b3772 Gitweb: https://git.kernel.org/tip/d88be187a6e6f3a97dfa7ddc500bb9ca191b3772 Author: H. Peter Anvin (Intel) <hpa@zytor.com> AuthorDate: Mon, 10 May 2021 02:09:39 -07:00 Committer: Ingo Molnar <mingo@kernel.org> CommitterDate: Mon, 10 May 2021 12:33:28 +02:00 x86/asm: Add _ASM_BYTES() macro for a .byte ... opcode sequence Make it easy to create a sequence of bytes that can be used in either assembly proper on in a C asm() statement. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20210510090940.924953-3-hpa@zytor.com --- arch/x86/include/asm/asm.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h index 93aad0b..507a37a 100644 --- a/arch/x86/include/asm/asm.h +++ b/arch/x86/include/asm/asm.h @@ -13,6 +13,8 @@ # define __ASM_FORM_COMMA(x, ...) " " __stringify(x,##__VA_ARGS__) "," #endif +#define _ASM_BYTES(x, ...) __ASM_FORM(.byte x,##__VA_ARGS__ ;) + #ifndef __x86_64__ /* 32 bit */ # define __ASM_SEL(a,b) __ASM_FORM(a) ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH 3/3] x86/asm: use _ASM_BYTES() in <asm/nops.h> 2021-05-10 9:09 [PATCH 0/3] x86/asm: macro improvements in <asm/asm.h> H. Peter Anvin 2021-05-10 9:09 ` [PATCH 1/3] x86/asm: have the __ASM_FORM macros handle commas in arguments H. Peter Anvin 2021-05-10 9:09 ` [PATCH 2/3] x86/asm: add _ASM_BYTES() macro for a .byte ... opcode sequence H. Peter Anvin @ 2021-05-10 9:09 ` H. Peter Anvin 2021-05-10 10:59 ` [tip: x86/asm] x86/asm: Use " tip-bot2 for H. Peter Anvin (Intel) 2 siblings, 1 reply; 7+ messages in thread From: H. Peter Anvin @ 2021-05-10 9:09 UTC (permalink / raw) To: Ingo Molnar, Thomas Gleixner, Borislav Petkov, Peter Zijlstra Cc: Linux Kernel Mailing List, H. Peter Anvin From: "H. Peter Anvin (Intel)" <hpa@zytor.com> Use the new generalized _ASM_BYTES() macro from <asm/asm.h> instead of the "home grown" _ASM_MK_NOP() in <asm/nops.h>. Add <asm/asm.h> and update <asm/nops.h> in the tools directory... Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> --- arch/x86/include/asm/nops.h | 24 ++-- tools/arch/x86/include/asm/asm.h | 189 ++++++++++++++++++++++++++++++ tools/arch/x86/include/asm/nops.h | 24 ++-- 3 files changed, 209 insertions(+), 28 deletions(-) create mode 100644 tools/arch/x86/include/asm/asm.h diff --git a/arch/x86/include/asm/nops.h b/arch/x86/include/asm/nops.h index c1e5e818ba16..c5573eaa5bb9 100644 --- a/arch/x86/include/asm/nops.h +++ b/arch/x86/include/asm/nops.h @@ -2,6 +2,8 @@ #ifndef _ASM_X86_NOPS_H #define _ASM_X86_NOPS_H +#include <asm/asm.h> + /* * Define nops for use with alternative() and for tracing. */ @@ -57,20 +59,14 @@ #endif /* CONFIG_64BIT */ -#ifdef __ASSEMBLY__ -#define _ASM_MK_NOP(x) .byte x -#else -#define _ASM_MK_NOP(x) ".byte " __stringify(x) "\n" -#endif - -#define ASM_NOP1 _ASM_MK_NOP(BYTES_NOP1) -#define ASM_NOP2 _ASM_MK_NOP(BYTES_NOP2) -#define ASM_NOP3 _ASM_MK_NOP(BYTES_NOP3) -#define ASM_NOP4 _ASM_MK_NOP(BYTES_NOP4) -#define ASM_NOP5 _ASM_MK_NOP(BYTES_NOP5) -#define ASM_NOP6 _ASM_MK_NOP(BYTES_NOP6) -#define ASM_NOP7 _ASM_MK_NOP(BYTES_NOP7) -#define ASM_NOP8 _ASM_MK_NOP(BYTES_NOP8) +#define ASM_NOP1 _ASM_BYTES(BYTES_NOP1) +#define ASM_NOP2 _ASM_BYTES(BYTES_NOP2) +#define ASM_NOP3 _ASM_BYTES(BYTES_NOP3) +#define ASM_NOP4 _ASM_BYTES(BYTES_NOP4) +#define ASM_NOP5 _ASM_BYTES(BYTES_NOP5) +#define ASM_NOP6 _ASM_BYTES(BYTES_NOP6) +#define ASM_NOP7 _ASM_BYTES(BYTES_NOP7) +#define ASM_NOP8 _ASM_BYTES(BYTES_NOP8) #define ASM_NOP_MAX 8 diff --git a/tools/arch/x86/include/asm/asm.h b/tools/arch/x86/include/asm/asm.h new file mode 100644 index 000000000000..1a1e22297867 --- /dev/null +++ b/tools/arch/x86/include/asm/asm.h @@ -0,0 +1,189 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_ASM_H +#define _ASM_X86_ASM_H + +#ifdef __ASSEMBLY__ +# define __ASM_FORM(x, ...) x,## __VA_ARGS__ +# define __ASM_FORM_RAW(x, ...) x,## __VA_ARGS__ +# define __ASM_FORM_COMMA(x, ...) x,## __VA_ARGS__, +#else +#include <linux/stringify.h> +# define __ASM_FORM(x, ...) " " __stringify(x,##__VA_ARGS__) " " +# define __ASM_FORM_RAW(x, ...) __stringify(x,##__VA_ARGS__) +# define __ASM_FORM_COMMA(x, ...) " " __stringify(x,##__VA_ARGS__) "," +#endif + +#define _ASM_BYTES(x, ...) __ASM_FORM(.byte x,##__VA_ARGS__ ;) + +#ifndef __x86_64__ +/* 32 bit */ +# define __ASM_SEL(a,b) __ASM_FORM(a) +# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a) +#else +/* 64 bit */ +# define __ASM_SEL(a,b) __ASM_FORM(b) +# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b) +#endif + +#define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \ + inst##q##__VA_ARGS__) +#define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg) + +#define _ASM_PTR __ASM_SEL(.long, .quad) +#define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8) + +#define _ASM_MOV __ASM_SIZE(mov) +#define _ASM_INC __ASM_SIZE(inc) +#define _ASM_DEC __ASM_SIZE(dec) +#define _ASM_ADD __ASM_SIZE(add) +#define _ASM_SUB __ASM_SIZE(sub) +#define _ASM_XADD __ASM_SIZE(xadd) +#define _ASM_MUL __ASM_SIZE(mul) + +#define _ASM_AX __ASM_REG(ax) +#define _ASM_BX __ASM_REG(bx) +#define _ASM_CX __ASM_REG(cx) +#define _ASM_DX __ASM_REG(dx) +#define _ASM_SP __ASM_REG(sp) +#define _ASM_BP __ASM_REG(bp) +#define _ASM_SI __ASM_REG(si) +#define _ASM_DI __ASM_REG(di) + +#ifndef __x86_64__ +/* 32 bit */ + +#define _ASM_ARG1 _ASM_AX +#define _ASM_ARG2 _ASM_DX +#define _ASM_ARG3 _ASM_CX + +#define _ASM_ARG1L eax +#define _ASM_ARG2L edx +#define _ASM_ARG3L ecx + +#define _ASM_ARG1W ax +#define _ASM_ARG2W dx +#define _ASM_ARG3W cx + +#define _ASM_ARG1B al +#define _ASM_ARG2B dl +#define _ASM_ARG3B cl + +#else +/* 64 bit */ + +#define _ASM_ARG1 _ASM_DI +#define _ASM_ARG2 _ASM_SI +#define _ASM_ARG3 _ASM_DX +#define _ASM_ARG4 _ASM_CX +#define _ASM_ARG5 r8 +#define _ASM_ARG6 r9 + +#define _ASM_ARG1Q rdi +#define _ASM_ARG2Q rsi +#define _ASM_ARG3Q rdx +#define _ASM_ARG4Q rcx +#define _ASM_ARG5Q r8 +#define _ASM_ARG6Q r9 + +#define _ASM_ARG1L edi +#define _ASM_ARG2L esi +#define _ASM_ARG3L edx +#define _ASM_ARG4L ecx +#define _ASM_ARG5L r8d +#define _ASM_ARG6L r9d + +#define _ASM_ARG1W di +#define _ASM_ARG2W si +#define _ASM_ARG3W dx +#define _ASM_ARG4W cx +#define _ASM_ARG5W r8w +#define _ASM_ARG6W r9w + +#define _ASM_ARG1B dil +#define _ASM_ARG2B sil +#define _ASM_ARG3B dl +#define _ASM_ARG4B cl +#define _ASM_ARG5B r8b +#define _ASM_ARG6B r9b + +#endif + +/* + * Macros to generate condition code outputs from inline assembly, + * The output operand must be type "bool". + */ +#ifdef __GCC_ASM_FLAG_OUTPUTS__ +# define CC_SET(c) "\n\t/* output condition code " #c "*/\n" +# define CC_OUT(c) "=@cc" #c +#else +# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n" +# define CC_OUT(c) [_cc_ ## c] "=qm" +#endif + +/* Exception table entry */ +#ifdef __ASSEMBLY__ +# define _ASM_EXTABLE_HANDLE(from, to, handler) \ + .pushsection "__ex_table","a" ; \ + .balign 4 ; \ + .long (from) - . ; \ + .long (to) - . ; \ + .long (handler) - . ; \ + .popsection + +# define _ASM_EXTABLE(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_default) + +# define _ASM_EXTABLE_UA(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess) + +# define _ASM_EXTABLE_CPY(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_copy) + +# define _ASM_EXTABLE_FAULT(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault) + +# ifdef CONFIG_KPROBES +# define _ASM_NOKPROBE(entry) \ + .pushsection "_kprobe_blacklist","aw" ; \ + _ASM_ALIGN ; \ + _ASM_PTR (entry); \ + .popsection +# else +# define _ASM_NOKPROBE(entry) +# endif + +#else /* ! __ASSEMBLY__ */ +# define _EXPAND_EXTABLE_HANDLE(x) #x +# define _ASM_EXTABLE_HANDLE(from, to, handler) \ + " .pushsection \"__ex_table\",\"a\"\n" \ + " .balign 4\n" \ + " .long (" #from ") - .\n" \ + " .long (" #to ") - .\n" \ + " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \ + " .popsection\n" + +# define _ASM_EXTABLE(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_default) + +# define _ASM_EXTABLE_UA(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess) + +# define _ASM_EXTABLE_CPY(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_copy) + +# define _ASM_EXTABLE_FAULT(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault) + +/* For C file, we already have NOKPROBE_SYMBOL macro */ + +/* + * This output constraint should be used for any inline asm which has a "call" + * instruction. Otherwise the asm may be inserted before the frame pointer + * gets set up by the containing function. If you forget to do this, objtool + * may print a "call without frame pointer save/setup" warning. + */ +register unsigned long current_stack_pointer asm(_ASM_SP); +#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer) +#endif /* __ASSEMBLY__ */ + +#endif /* _ASM_X86_ASM_H */ diff --git a/tools/arch/x86/include/asm/nops.h b/tools/arch/x86/include/asm/nops.h index c1e5e818ba16..c5573eaa5bb9 100644 --- a/tools/arch/x86/include/asm/nops.h +++ b/tools/arch/x86/include/asm/nops.h @@ -2,6 +2,8 @@ #ifndef _ASM_X86_NOPS_H #define _ASM_X86_NOPS_H +#include <asm/asm.h> + /* * Define nops for use with alternative() and for tracing. */ @@ -57,20 +59,14 @@ #endif /* CONFIG_64BIT */ -#ifdef __ASSEMBLY__ -#define _ASM_MK_NOP(x) .byte x -#else -#define _ASM_MK_NOP(x) ".byte " __stringify(x) "\n" -#endif - -#define ASM_NOP1 _ASM_MK_NOP(BYTES_NOP1) -#define ASM_NOP2 _ASM_MK_NOP(BYTES_NOP2) -#define ASM_NOP3 _ASM_MK_NOP(BYTES_NOP3) -#define ASM_NOP4 _ASM_MK_NOP(BYTES_NOP4) -#define ASM_NOP5 _ASM_MK_NOP(BYTES_NOP5) -#define ASM_NOP6 _ASM_MK_NOP(BYTES_NOP6) -#define ASM_NOP7 _ASM_MK_NOP(BYTES_NOP7) -#define ASM_NOP8 _ASM_MK_NOP(BYTES_NOP8) +#define ASM_NOP1 _ASM_BYTES(BYTES_NOP1) +#define ASM_NOP2 _ASM_BYTES(BYTES_NOP2) +#define ASM_NOP3 _ASM_BYTES(BYTES_NOP3) +#define ASM_NOP4 _ASM_BYTES(BYTES_NOP4) +#define ASM_NOP5 _ASM_BYTES(BYTES_NOP5) +#define ASM_NOP6 _ASM_BYTES(BYTES_NOP6) +#define ASM_NOP7 _ASM_BYTES(BYTES_NOP7) +#define ASM_NOP8 _ASM_BYTES(BYTES_NOP8) #define ASM_NOP_MAX 8 -- 2.31.1 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [tip: x86/asm] x86/asm: Use _ASM_BYTES() in <asm/nops.h> 2021-05-10 9:09 ` [PATCH 3/3] x86/asm: use _ASM_BYTES() in <asm/nops.h> H. Peter Anvin @ 2021-05-10 10:59 ` tip-bot2 for H. Peter Anvin (Intel) 0 siblings, 0 replies; 7+ messages in thread From: tip-bot2 for H. Peter Anvin (Intel) @ 2021-05-10 10:59 UTC (permalink / raw) To: linux-tip-commits; +Cc: H. Peter Anvin (Intel), Ingo Molnar, x86, linux-kernel The following commit has been merged into the x86/asm branch of tip: Commit-ID: eef23e72b78b36924aea8be5ec7c54e628c442ef Gitweb: https://git.kernel.org/tip/eef23e72b78b36924aea8be5ec7c54e628c442ef Author: H. Peter Anvin (Intel) <hpa@zytor.com> AuthorDate: Mon, 10 May 2021 02:09:40 -07:00 Committer: Ingo Molnar <mingo@kernel.org> CommitterDate: Mon, 10 May 2021 12:33:28 +02:00 x86/asm: Use _ASM_BYTES() in <asm/nops.h> Use the new generalized _ASM_BYTES() macro from <asm/asm.h> instead of the "home grown" _ASM_MK_NOP() in <asm/nops.h>. Add <asm/asm.h> and update <asm/nops.h> in the tools directory... Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20210510090940.924953-4-hpa@zytor.com --- arch/x86/include/asm/nops.h | 24 +--- tools/arch/x86/include/asm/asm.h | 189 +++++++++++++++++++++++++++++- tools/arch/x86/include/asm/nops.h | 24 +--- 3 files changed, 209 insertions(+), 28 deletions(-) create mode 100644 tools/arch/x86/include/asm/asm.h diff --git a/arch/x86/include/asm/nops.h b/arch/x86/include/asm/nops.h index c1e5e81..c5573ea 100644 --- a/arch/x86/include/asm/nops.h +++ b/arch/x86/include/asm/nops.h @@ -2,6 +2,8 @@ #ifndef _ASM_X86_NOPS_H #define _ASM_X86_NOPS_H +#include <asm/asm.h> + /* * Define nops for use with alternative() and for tracing. */ @@ -57,20 +59,14 @@ #endif /* CONFIG_64BIT */ -#ifdef __ASSEMBLY__ -#define _ASM_MK_NOP(x) .byte x -#else -#define _ASM_MK_NOP(x) ".byte " __stringify(x) "\n" -#endif - -#define ASM_NOP1 _ASM_MK_NOP(BYTES_NOP1) -#define ASM_NOP2 _ASM_MK_NOP(BYTES_NOP2) -#define ASM_NOP3 _ASM_MK_NOP(BYTES_NOP3) -#define ASM_NOP4 _ASM_MK_NOP(BYTES_NOP4) -#define ASM_NOP5 _ASM_MK_NOP(BYTES_NOP5) -#define ASM_NOP6 _ASM_MK_NOP(BYTES_NOP6) -#define ASM_NOP7 _ASM_MK_NOP(BYTES_NOP7) -#define ASM_NOP8 _ASM_MK_NOP(BYTES_NOP8) +#define ASM_NOP1 _ASM_BYTES(BYTES_NOP1) +#define ASM_NOP2 _ASM_BYTES(BYTES_NOP2) +#define ASM_NOP3 _ASM_BYTES(BYTES_NOP3) +#define ASM_NOP4 _ASM_BYTES(BYTES_NOP4) +#define ASM_NOP5 _ASM_BYTES(BYTES_NOP5) +#define ASM_NOP6 _ASM_BYTES(BYTES_NOP6) +#define ASM_NOP7 _ASM_BYTES(BYTES_NOP7) +#define ASM_NOP8 _ASM_BYTES(BYTES_NOP8) #define ASM_NOP_MAX 8 diff --git a/tools/arch/x86/include/asm/asm.h b/tools/arch/x86/include/asm/asm.h new file mode 100644 index 0000000..507a37a --- /dev/null +++ b/tools/arch/x86/include/asm/asm.h @@ -0,0 +1,189 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_ASM_H +#define _ASM_X86_ASM_H + +#ifdef __ASSEMBLY__ +# define __ASM_FORM(x, ...) x,## __VA_ARGS__ +# define __ASM_FORM_RAW(x, ...) x,## __VA_ARGS__ +# define __ASM_FORM_COMMA(x, ...) x,## __VA_ARGS__, +#else +#include <linux/stringify.h> +# define __ASM_FORM(x, ...) " " __stringify(x,##__VA_ARGS__) " " +# define __ASM_FORM_RAW(x, ...) __stringify(x,##__VA_ARGS__) +# define __ASM_FORM_COMMA(x, ...) " " __stringify(x,##__VA_ARGS__) "," +#endif + +#define _ASM_BYTES(x, ...) __ASM_FORM(.byte x,##__VA_ARGS__ ;) + +#ifndef __x86_64__ +/* 32 bit */ +# define __ASM_SEL(a,b) __ASM_FORM(a) +# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a) +#else +/* 64 bit */ +# define __ASM_SEL(a,b) __ASM_FORM(b) +# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b) +#endif + +#define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \ + inst##q##__VA_ARGS__) +#define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg) + +#define _ASM_PTR __ASM_SEL(.long, .quad) +#define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8) + +#define _ASM_MOV __ASM_SIZE(mov) +#define _ASM_INC __ASM_SIZE(inc) +#define _ASM_DEC __ASM_SIZE(dec) +#define _ASM_ADD __ASM_SIZE(add) +#define _ASM_SUB __ASM_SIZE(sub) +#define _ASM_XADD __ASM_SIZE(xadd) +#define _ASM_MUL __ASM_SIZE(mul) + +#define _ASM_AX __ASM_REG(ax) +#define _ASM_BX __ASM_REG(bx) +#define _ASM_CX __ASM_REG(cx) +#define _ASM_DX __ASM_REG(dx) +#define _ASM_SP __ASM_REG(sp) +#define _ASM_BP __ASM_REG(bp) +#define _ASM_SI __ASM_REG(si) +#define _ASM_DI __ASM_REG(di) + +#ifndef __x86_64__ +/* 32 bit */ + +#define _ASM_ARG1 _ASM_AX +#define _ASM_ARG2 _ASM_DX +#define _ASM_ARG3 _ASM_CX + +#define _ASM_ARG1L eax +#define _ASM_ARG2L edx +#define _ASM_ARG3L ecx + +#define _ASM_ARG1W ax +#define _ASM_ARG2W dx +#define _ASM_ARG3W cx + +#define _ASM_ARG1B al +#define _ASM_ARG2B dl +#define _ASM_ARG3B cl + +#else +/* 64 bit */ + +#define _ASM_ARG1 _ASM_DI +#define _ASM_ARG2 _ASM_SI +#define _ASM_ARG3 _ASM_DX +#define _ASM_ARG4 _ASM_CX +#define _ASM_ARG5 r8 +#define _ASM_ARG6 r9 + +#define _ASM_ARG1Q rdi +#define _ASM_ARG2Q rsi +#define _ASM_ARG3Q rdx +#define _ASM_ARG4Q rcx +#define _ASM_ARG5Q r8 +#define _ASM_ARG6Q r9 + +#define _ASM_ARG1L edi +#define _ASM_ARG2L esi +#define _ASM_ARG3L edx +#define _ASM_ARG4L ecx +#define _ASM_ARG5L r8d +#define _ASM_ARG6L r9d + +#define _ASM_ARG1W di +#define _ASM_ARG2W si +#define _ASM_ARG3W dx +#define _ASM_ARG4W cx +#define _ASM_ARG5W r8w +#define _ASM_ARG6W r9w + +#define _ASM_ARG1B dil +#define _ASM_ARG2B sil +#define _ASM_ARG3B dl +#define _ASM_ARG4B cl +#define _ASM_ARG5B r8b +#define _ASM_ARG6B r9b + +#endif + +/* + * Macros to generate condition code outputs from inline assembly, + * The output operand must be type "bool". + */ +#ifdef __GCC_ASM_FLAG_OUTPUTS__ +# define CC_SET(c) "\n\t/* output condition code " #c "*/\n" +# define CC_OUT(c) "=@cc" #c +#else +# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n" +# define CC_OUT(c) [_cc_ ## c] "=qm" +#endif + +/* Exception table entry */ +#ifdef __ASSEMBLY__ +# define _ASM_EXTABLE_HANDLE(from, to, handler) \ + .pushsection "__ex_table","a" ; \ + .balign 4 ; \ + .long (from) - . ; \ + .long (to) - . ; \ + .long (handler) - . ; \ + .popsection + +# define _ASM_EXTABLE(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_default) + +# define _ASM_EXTABLE_UA(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess) + +# define _ASM_EXTABLE_CPY(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_copy) + +# define _ASM_EXTABLE_FAULT(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault) + +# ifdef CONFIG_KPROBES +# define _ASM_NOKPROBE(entry) \ + .pushsection "_kprobe_blacklist","aw" ; \ + _ASM_ALIGN ; \ + _ASM_PTR (entry); \ + .popsection +# else +# define _ASM_NOKPROBE(entry) +# endif + +#else /* ! __ASSEMBLY__ */ +# define _EXPAND_EXTABLE_HANDLE(x) #x +# define _ASM_EXTABLE_HANDLE(from, to, handler) \ + " .pushsection \"__ex_table\",\"a\"\n" \ + " .balign 4\n" \ + " .long (" #from ") - .\n" \ + " .long (" #to ") - .\n" \ + " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \ + " .popsection\n" + +# define _ASM_EXTABLE(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_default) + +# define _ASM_EXTABLE_UA(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess) + +# define _ASM_EXTABLE_CPY(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_copy) + +# define _ASM_EXTABLE_FAULT(from, to) \ + _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault) + +/* For C file, we already have NOKPROBE_SYMBOL macro */ + +/* + * This output constraint should be used for any inline asm which has a "call" + * instruction. Otherwise the asm may be inserted before the frame pointer + * gets set up by the containing function. If you forget to do this, objtool + * may print a "call without frame pointer save/setup" warning. + */ +register unsigned long current_stack_pointer asm(_ASM_SP); +#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer) +#endif /* __ASSEMBLY__ */ + +#endif /* _ASM_X86_ASM_H */ diff --git a/tools/arch/x86/include/asm/nops.h b/tools/arch/x86/include/asm/nops.h index c1e5e81..c5573ea 100644 --- a/tools/arch/x86/include/asm/nops.h +++ b/tools/arch/x86/include/asm/nops.h @@ -2,6 +2,8 @@ #ifndef _ASM_X86_NOPS_H #define _ASM_X86_NOPS_H +#include <asm/asm.h> + /* * Define nops for use with alternative() and for tracing. */ @@ -57,20 +59,14 @@ #endif /* CONFIG_64BIT */ -#ifdef __ASSEMBLY__ -#define _ASM_MK_NOP(x) .byte x -#else -#define _ASM_MK_NOP(x) ".byte " __stringify(x) "\n" -#endif - -#define ASM_NOP1 _ASM_MK_NOP(BYTES_NOP1) -#define ASM_NOP2 _ASM_MK_NOP(BYTES_NOP2) -#define ASM_NOP3 _ASM_MK_NOP(BYTES_NOP3) -#define ASM_NOP4 _ASM_MK_NOP(BYTES_NOP4) -#define ASM_NOP5 _ASM_MK_NOP(BYTES_NOP5) -#define ASM_NOP6 _ASM_MK_NOP(BYTES_NOP6) -#define ASM_NOP7 _ASM_MK_NOP(BYTES_NOP7) -#define ASM_NOP8 _ASM_MK_NOP(BYTES_NOP8) +#define ASM_NOP1 _ASM_BYTES(BYTES_NOP1) +#define ASM_NOP2 _ASM_BYTES(BYTES_NOP2) +#define ASM_NOP3 _ASM_BYTES(BYTES_NOP3) +#define ASM_NOP4 _ASM_BYTES(BYTES_NOP4) +#define ASM_NOP5 _ASM_BYTES(BYTES_NOP5) +#define ASM_NOP6 _ASM_BYTES(BYTES_NOP6) +#define ASM_NOP7 _ASM_BYTES(BYTES_NOP7) +#define ASM_NOP8 _ASM_BYTES(BYTES_NOP8) #define ASM_NOP_MAX 8 ^ permalink raw reply related [flat|nested] 7+ messages in thread
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