summaryrefslogtreecommitdiff
path: root/arch/x86/include/asm/asm.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/include/asm/asm.h')
-rw-r--r--arch/x86/include/asm/asm.h158
1 files changed, 111 insertions, 47 deletions
diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
index 3ad3da9a7d97..0e8c611bc9e2 100644
--- a/arch/x86/include/asm/asm.h
+++ b/arch/x86/include/asm/asm.h
@@ -2,15 +2,19 @@
#ifndef _ASM_X86_ASM_H
#define _ASM_X86_ASM_H
-#ifdef __ASSEMBLY__
+#include <linux/annotate.h>
+
+#ifdef __ASSEMBLER__
# define __ASM_FORM(x, ...) x,## __VA_ARGS__
# define __ASM_FORM_RAW(x, ...) x,## __VA_ARGS__
# define __ASM_FORM_COMMA(x, ...) x,## __VA_ARGS__,
+# define __ASM_REGPFX %
#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__) ","
+# define __ASM_REGPFX %%
#endif
#define _ASM_BYTES(x, ...) __ASM_FORM(.byte x,##__VA_ARGS__ ;)
@@ -49,6 +53,9 @@
#define _ASM_SI __ASM_REG(si)
#define _ASM_DI __ASM_REG(di)
+/* Adds a (%rip) suffix on 64 bits only; for immediate memory references */
+#define _ASM_RIP(x) __ASM_SEL_RAW(x, x (__ASM_REGPFX rip))
+
#ifndef __x86_64__
/* 32 bit */
@@ -108,41 +115,33 @@
#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"
+#ifndef __ASSEMBLER__
+static __always_inline __pure void *rip_rel_ptr(void *p)
+{
+ asm("leaq %c1(%%rip), %0" : "=r"(p) : "i"(p));
+
+ return p;
+}
#endif
#ifdef __KERNEL__
-/* 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)
+#ifndef COMPILE_OFFSETS
+#include <asm/asm-offsets.h>
+#endif
-# define _ASM_EXTABLE_CPY(from, to) \
- _ASM_EXTABLE_HANDLE(from, to, ex_handler_copy)
+# include <asm/extable_fixup_types.h>
-# define _ASM_EXTABLE_FAULT(from, to) \
- _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
+/* Exception table entry */
+#ifdef __ASSEMBLER__
+
+# define _ASM_EXTABLE_TYPE(from, to, type) \
+ .pushsection "__ex_table", "aM", @progbits, EXTABLE_SIZE ; \
+ .balign 4 ; \
+ .long (from) - . ; \
+ .long (to) - . ; \
+ .long type ; \
+ .popsection
# ifdef CONFIG_KPROBES
# define _ASM_NOKPROBE(entry) \
@@ -154,29 +153,67 @@
# 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" \
+#else /* ! __ASSEMBLER__ */
+
+# define DEFINE_EXTABLE_TYPE_REG \
+ ".macro extable_type_reg type:req reg:req\n" \
+ ".set .Lfound, 0\n" \
+ ".set .Lregnr, 0\n" \
+ ".irp rs,rax,rcx,rdx,rbx,rsp,rbp,rsi,rdi,r8,r9,r10,r11,r12,r13,r14,r15\n" \
+ ".ifc \\reg, %%\\rs\n" \
+ ".set .Lfound, .Lfound+1\n" \
+ ".long \\type + (.Lregnr << 8)\n" \
+ ".endif\n" \
+ ".set .Lregnr, .Lregnr+1\n" \
+ ".endr\n" \
+ ".set .Lregnr, 0\n" \
+ ".irp rs,eax,ecx,edx,ebx,esp,ebp,esi,edi,r8d,r9d,r10d,r11d,r12d,r13d,r14d,r15d\n" \
+ ".ifc \\reg, %%\\rs\n" \
+ ".set .Lfound, .Lfound+1\n" \
+ ".long \\type + (.Lregnr << 8)\n" \
+ ".endif\n" \
+ ".set .Lregnr, .Lregnr+1\n" \
+ ".endr\n" \
+ ".if (.Lfound != 1)\n" \
+ ".error \"extable_type_reg: bad register argument\"\n" \
+ ".endif\n" \
+ ".endm\n"
+
+# define UNDEFINE_EXTABLE_TYPE_REG \
+ ".purgem extable_type_reg\n"
+
+# define _ASM_EXTABLE_TYPE(from, to, type) \
+ " .pushsection __ex_table, \"aM\", @progbits, " \
+ __stringify(EXTABLE_SIZE) "\n" \
" .balign 4\n" \
" .long (" #from ") - .\n" \
" .long (" #to ") - .\n" \
- " .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \
+ " .long " __stringify(type) " \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_TYPE_REG(from, to, type, reg) \
+ " .pushsection __ex_table, \"aM\", @progbits, " \
+ __stringify(EXTABLE_SIZE) "\n" \
+ " .balign 4\n" \
+ " .long (" #from ") - .\n" \
+ " .long (" #to ") - .\n" \
+ DEFINE_EXTABLE_TYPE_REG \
+ "extable_type_reg reg=" __stringify(reg) ", type=" __stringify(type) " \n"\
+ UNDEFINE_EXTABLE_TYPE_REG \
+ " .popsection\n"
-# define _ASM_EXTABLE_CPY(from, to) \
- _ASM_EXTABLE_HANDLE(from, to, ex_handler_copy)
+/* For C file, we already have NOKPROBE_SYMBOL macro */
-# define _ASM_EXTABLE_FAULT(from, to) \
- _ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
+/* Insert a comma if args are non-empty */
+#define COMMA(x...) __COMMA(x)
+#define __COMMA(...) , ##__VA_ARGS__
-/* For C file, we already have NOKPROBE_SYMBOL macro */
+/*
+ * Combine multiple asm inline constraint args into a single arg for passing to
+ * another macro.
+ */
+#define ASM_OUTPUT(x...) x
+#define ASM_INPUT(x...) x
/*
* This output constraint should be used for any inline asm which has a "call"
@@ -186,8 +223,35 @@
*/
register unsigned long current_stack_pointer asm(_ASM_SP);
#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
-#endif /* __KERNEL__ */
+#define _ASM_EXTABLE(from, to) \
+ _ASM_EXTABLE_TYPE(from, to, EX_TYPE_DEFAULT)
+
+#define _ASM_EXTABLE_UA(from, to) \
+ _ASM_EXTABLE_TYPE(from, to, EX_TYPE_UACCESS)
+#define _ASM_EXTABLE_FAULT(from, to) \
+ _ASM_EXTABLE_TYPE(from, to, EX_TYPE_FAULT)
+
+/*
+ * Both i386 and x86_64 returns 64-bit values in edx:eax for certain
+ * instructions, but GCC's "A" constraint has different meanings.
+ * For i386, "A" means exactly edx:eax, while for x86_64 it
+ * means rax *or* rdx.
+ *
+ * These helpers wrapping these semantic differences save one instruction
+ * clearing the high half of 'low':
+ */
+#ifdef CONFIG_X86_64
+# define EAX_EDX_DECLARE_ARGS(val, low, high) unsigned long low, high
+# define EAX_EDX_VAL(val, low, high) ((low) | (high) << 32)
+# define EAX_EDX_RET(val, low, high) "=a" (low), "=d" (high)
+#else
+# define EAX_EDX_DECLARE_ARGS(val, low, high) u64 val
+# define EAX_EDX_VAL(val, low, high) (val)
+# define EAX_EDX_RET(val, low, high) "=A" (val)
+#endif
+
+#endif /* __KERNEL__ */
#endif /* _ASM_X86_ASM_H */
generated by cgit (git 2.34.1) at 2025-12-24 18:09:41 +0000