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Commit aa98936e authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 

* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, 64-bit: ifdef out struct thread_struct::ip
  x86, 32-bit: ifdef out struct thread_struct::fs
  x86: clean up alternative.h
parents 082b63ae 0c23590f

arch/x86/include/asm/alternative.h

+23 −36
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 


#include <linux/types.h>

#include <linux/stddef.h>

#include <linux/stringify.h>

#include <asm/asm.h>



/*
@@ -74,6 +75,22 @@ static inline void alternatives_smp_switch(int smp) {} 


const unsigned char *const *find_nop_table(void);



/* alternative assembly primitive: */

#define ALTERNATIVE(oldinstr, newinstr, feature)			\

									\

      "661:\n\t" oldinstr "\n662:\n"					\

      ".section .altinstructions,\"a\"\n"				\

      _ASM_ALIGN "\n"							\

      _ASM_PTR "661b\n"				/* label           */	\

      _ASM_PTR "663f\n"				/* new instruction */	\

      "	 .byte " __stringify(feature) "\n"	/* feature bit     */	\

      "	 .byte 662b-661b\n"			/* sourcelen       */	\

      "	 .byte 664f-663f\n"			/* replacementlen  */	\

      ".previous\n"							\

      ".section .altinstr_replacement, \"ax\"\n"			\

      "663:\n\t" newinstr "\n664:\n"		/* replacement     */	\

      ".previous"



/*

 * Alternative instructions for different CPU types or capabilities.

 *
@@ -87,18 +104,7 @@ const unsigned char *const *find_nop_table(void); 
 * without volatile and memory clobber.

 */

#define alternative(oldinstr, newinstr, feature)			\

	asm volatile ("661:\n\t" oldinstr "\n662:\n"			\

		      ".section .altinstructions,\"a\"\n"		\

		      _ASM_ALIGN "\n"					\

		      _ASM_PTR "661b\n"		/* label */		\

		      _ASM_PTR "663f\n"		/* new instruction */	\

		      "	 .byte %c0\n"		/* feature bit */	\

		      "	 .byte 662b-661b\n"	/* sourcelen */		\

		      "	 .byte 664f-663f\n"	/* replacementlen */	\

		      ".previous\n"					\

		      ".section .altinstr_replacement,\"ax\"\n"		\

		      "663:\n\t" newinstr "\n664:\n"  /* replacement */	\

		      ".previous" :: "i" (feature) : "memory")

	asm volatile (ALTERNATIVE(oldinstr, newinstr, feature) : : : "memory")



/*

 * Alternative inline assembly with input.
@@ -109,35 +115,16 @@ const unsigned char *const *find_nop_table(void); 
 * Best is to use constraints that are fixed size (like (%1) ... "r")

 * If you use variable sized constraints like "m" or "g" in the

 * replacement make sure to pad to the worst case length.

 * Leaving an unused argument 0 to keep API compatibility.

 */

#define alternative_input(oldinstr, newinstr, feature, input...)	\

	asm volatile ("661:\n\t" oldinstr "\n662:\n"			\

		      ".section .altinstructions,\"a\"\n"		\

		      _ASM_ALIGN "\n"					\

		      _ASM_PTR "661b\n"		/* label */		\

		      _ASM_PTR "663f\n"		/* new instruction */	\

		      "	 .byte %c0\n"		/* feature bit */	\

		      "	 .byte 662b-661b\n"	/* sourcelen */		\

		      "	 .byte 664f-663f\n"	/* replacementlen */	\

		      ".previous\n"					\

		      ".section .altinstr_replacement,\"ax\"\n"		\

		      "663:\n\t" newinstr "\n664:\n"  /* replacement */	\

		      ".previous" :: "i" (feature), ##input)

	asm volatile (ALTERNATIVE(oldinstr, newinstr, feature)		\

		: : "i" (0), ## input)



/* Like alternative_input, but with a single output argument */

#define alternative_io(oldinstr, newinstr, feature, output, input...)	\

	asm volatile ("661:\n\t" oldinstr "\n662:\n"			\

		      ".section .altinstructions,\"a\"\n"		\

		      _ASM_ALIGN "\n"					\

		      _ASM_PTR "661b\n"		/* label */		\

		      _ASM_PTR "663f\n"		/* new instruction */	\

		      "	 .byte %c[feat]\n"	/* feature bit */	\

		      "	 .byte 662b-661b\n"	/* sourcelen */		\

		      "	 .byte 664f-663f\n"	/* replacementlen */	\

		      ".previous\n"					\

		      ".section .altinstr_replacement,\"ax\"\n"		\

		      "663:\n\t" newinstr "\n664:\n"  /* replacement */ \

		      ".previous" : output : [feat] "i" (feature), ##input)

	asm volatile (ALTERNATIVE(oldinstr, newinstr, feature)		\

		: output : "i" (0), ## input)



/*

 * use this macro(s) if you need more than one output parameter

arch/x86/include/asm/processor.h

+4 −1
Original line number Diff line number Diff line
@@ -428,8 +428,12 @@ struct thread_struct { 
	unsigned short		fsindex;

	unsigned short		gsindex;

#endif

#ifdef CONFIG_X86_32

	unsigned long		ip;

#endif

#ifdef CONFIG_X86_64

	unsigned long		fs;

#endif

	unsigned long		gs;

	/* Hardware debugging registers: */

	unsigned long		debugreg0;
@@ -876,7 +880,6 @@ static inline void spin_lock_prefetch(const void *x) 
	.vm86_info		= NULL,					  \

	.sysenter_cs		= __KERNEL_CS,				  \

	.io_bitmap_ptr		= NULL,					  \

	.fs			= __KERNEL_PERCPU,			  \

}



/*

arch/x86/kernel/kgdb.c

+1 −1
Original line number Diff line number Diff line
@@ -142,7 +142,7 @@ void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) 
	gdb_regs32[GDB_PS]	= *(unsigned long *)(p->thread.sp + 8);

	gdb_regs32[GDB_CS]	= __KERNEL_CS;

	gdb_regs32[GDB_SS]	= __KERNEL_DS;

	gdb_regs[GDB_PC]	= p->thread.ip;

	gdb_regs[GDB_PC]	= 0;

	gdb_regs[GDB_R8]	= 0;

	gdb_regs[GDB_R9]	= 0;

	gdb_regs[GDB_R10]	= 0;