mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 05:04:00 +08:00
121843eb02
The constraint "rm" allows the compiler to put mix_const into memory. When the input operand is a memory location then MUL needs an operand size suffix, since Clang can't infer the multiplication width from the operand. Add and use the _ASM_MUL macro which determines the operand size and resolves to the NUL instruction with the corresponding suffix. This fixes the following error when building with clang: CC arch/x86/lib/kaslr.o /tmp/kaslr-dfe1ad.s: Assembler messages: /tmp/kaslr-dfe1ad.s:182: Error: no instruction mnemonic suffix given and no register operands; can't size instruction Signed-off-by: Matthias Kaehlcke <mka@chromium.org> Cc: Grant Grundler <grundler@chromium.org> Cc: Greg Hackmann <ghackmann@google.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michael Davidson <md@google.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20170501224741.133938-1-mka@chromium.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
#ifndef _ASM_X86_ASM_H
|
|
#define _ASM_X86_ASM_H
|
|
|
|
#ifdef __ASSEMBLY__
|
|
# define __ASM_FORM(x) x
|
|
# define __ASM_FORM_RAW(x) x
|
|
# define __ASM_FORM_COMMA(x) x,
|
|
#else
|
|
# define __ASM_FORM(x) " " #x " "
|
|
# define __ASM_FORM_RAW(x) #x
|
|
# define __ASM_FORM_COMMA(x) " " #x ","
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_32
|
|
# define __ASM_SEL(a,b) __ASM_FORM(a)
|
|
# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
|
|
#else
|
|
# 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)
|
|
|
|
/*
|
|
* 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_FAULT(from, to) \
|
|
_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
|
|
|
|
# define _ASM_EXTABLE_EX(from, to) \
|
|
_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
|
|
|
|
# define _ASM_NOKPROBE(entry) \
|
|
.pushsection "_kprobe_blacklist","aw" ; \
|
|
_ASM_ALIGN ; \
|
|
_ASM_PTR (entry); \
|
|
.popsection
|
|
|
|
.macro ALIGN_DESTINATION
|
|
/* check for bad alignment of destination */
|
|
movl %edi,%ecx
|
|
andl $7,%ecx
|
|
jz 102f /* already aligned */
|
|
subl $8,%ecx
|
|
negl %ecx
|
|
subl %ecx,%edx
|
|
100: movb (%rsi),%al
|
|
101: movb %al,(%rdi)
|
|
incq %rsi
|
|
incq %rdi
|
|
decl %ecx
|
|
jnz 100b
|
|
102:
|
|
.section .fixup,"ax"
|
|
103: addl %ecx,%edx /* ecx is zerorest also */
|
|
jmp copy_user_handle_tail
|
|
.previous
|
|
|
|
_ASM_EXTABLE(100b,103b)
|
|
_ASM_EXTABLE(101b,103b)
|
|
.endm
|
|
|
|
#else
|
|
# 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_FAULT(from, to) \
|
|
_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
|
|
|
|
# define _ASM_EXTABLE_EX(from, to) \
|
|
_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
|
|
|
|
/* For C file, we already have NOKPROBE_SYMBOL macro */
|
|
#endif
|
|
|
|
#endif /* _ASM_X86_ASM_H */
|