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linux-stable-rt/arch/blackfin/include/asm/fixed_code.h

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Blackfin arch: defines and provides entry points for certain user space functions at fixed addresses This patch defines (and provides) entry points for certain user space functions at fixed addresses. The Blackfin has no usable atomic instructions, but we can ensure that these code sequences appear atomic from a user space point of view by detecting when we're in the process of executing them during the interrupt handler return path. This allows much more efficient pthread lock implementations than the bfin_spinlock syscall we're currently using. Also provided is a small sys_rt_sigreturn stub which can be used by the signal handler setup code. The signal.c part will be committed separately. Signed-off-by: Bernd Schmidt <bernd.schmidt@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
2007-06-21 11:34:16 +08:00
/* This file defines the fixed addresses where userspace programs can find
atomic code sequences. */
Blackfin arch: move fixed code defines into fixed_code.h as very few things actually need to know these details Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-08-14 14:36:15 +08:00
#ifndef __BFIN_ASM_FIXED_CODE_H__
#define __BFIN_ASM_FIXED_CODE_H__
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
#include <linux/linkage.h>
#include <linux/ptrace.h>
extern asmlinkage void finish_atomic_sections(struct pt_regs *regs);
extern char fixed_code_start;
extern char fixed_code_end;
extern int atomic_xchg32(void);
extern int atomic_cas32(void);
extern int atomic_add32(void);
extern int atomic_sub32(void);
extern int atomic_ior32(void);
extern int atomic_and32(void);
extern int atomic_xor32(void);
extern void safe_user_instruction(void);
extern void sigreturn_stub(void);
#endif
#endif
Blackfin arch: defines and provides entry points for certain user space functions at fixed addresses This patch defines (and provides) entry points for certain user space functions at fixed addresses. The Blackfin has no usable atomic instructions, but we can ensure that these code sequences appear atomic from a user space point of view by detecting when we're in the process of executing them during the interrupt handler return path. This allows much more efficient pthread lock implementations than the bfin_spinlock syscall we're currently using. Also provided is a small sys_rt_sigreturn stub which can be used by the signal handler setup code. The signal.c part will be committed separately. Signed-off-by: Bernd Schmidt <bernd.schmidt@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
2007-06-21 11:34:16 +08:00
#define FIXED_CODE_START 0x400
#define SIGRETURN_STUB 0x400
#define ATOMIC_SEQS_START 0x410
#define ATOMIC_XCHG32 0x410
#define ATOMIC_CAS32 0x420
#define ATOMIC_ADD32 0x430
#define ATOMIC_SUB32 0x440
#define ATOMIC_IOR32 0x450
#define ATOMIC_AND32 0x460
#define ATOMIC_XOR32 0x470
#define ATOMIC_SEQS_END 0x480
Blackfin arch: ensure that speculative loads of bad pointers don't cause us to do bad things. Fix/change formatting of a few more things. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
2007-10-29 18:23:28 +08:00
#define SAFE_USER_INSTRUCTION 0x480
#define FIXED_CODE_END 0x490
Blackfin arch: move fixed code defines into fixed_code.h as very few things actually need to know these details Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-08-14 14:36:15 +08:00
#endif