a3f9985843
GCC 4.x really dislikes the games we are playing in unaligned.c, and the cleanest way to fix this is to move things into assembler. Noted by Al Viro. Signed-off-by: David S. Miller <davem@davemloft.net>
263 lines
8.3 KiB
C
263 lines
8.3 KiB
C
/* $Id: thread_info.h,v 1.1 2002/02/10 00:00:58 davem Exp $
|
|
* thread_info.h: sparc64 low-level thread information
|
|
*
|
|
* Copyright (C) 2002 David S. Miller (davem@redhat.com)
|
|
*/
|
|
|
|
#ifndef _ASM_THREAD_INFO_H
|
|
#define _ASM_THREAD_INFO_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#define NSWINS 7
|
|
|
|
#define TI_FLAG_BYTE_FAULT_CODE 0
|
|
#define TI_FLAG_FAULT_CODE_SHIFT 56
|
|
#define TI_FLAG_BYTE_WSTATE 1
|
|
#define TI_FLAG_WSTATE_SHIFT 48
|
|
#define TI_FLAG_BYTE_CWP 2
|
|
#define TI_FLAG_CWP_SHIFT 40
|
|
#define TI_FLAG_BYTE_CURRENT_DS 3
|
|
#define TI_FLAG_CURRENT_DS_SHIFT 32
|
|
#define TI_FLAG_BYTE_FPDEPTH 4
|
|
#define TI_FLAG_FPDEPTH_SHIFT 24
|
|
#define TI_FLAG_BYTE_WSAVED 5
|
|
#define TI_FLAG_WSAVED_SHIFT 16
|
|
|
|
#include <asm/page.h>
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <asm/types.h>
|
|
|
|
struct task_struct;
|
|
struct exec_domain;
|
|
|
|
struct thread_info {
|
|
/* D$ line 1 */
|
|
struct task_struct *task;
|
|
unsigned long flags;
|
|
__u8 cpu;
|
|
__u8 fpsaved[7];
|
|
unsigned long ksp;
|
|
|
|
/* D$ line 2 */
|
|
unsigned long fault_address;
|
|
struct pt_regs *kregs;
|
|
struct exec_domain *exec_domain;
|
|
int preempt_count; /* 0 => preemptable, <0 => BUG */
|
|
__u8 new_child;
|
|
__u8 syscall_noerror;
|
|
__u16 __pad;
|
|
|
|
unsigned long *utraps;
|
|
|
|
struct reg_window reg_window[NSWINS];
|
|
unsigned long rwbuf_stkptrs[NSWINS];
|
|
|
|
unsigned long gsr[7];
|
|
unsigned long xfsr[7];
|
|
|
|
__u64 __user *user_cntd0;
|
|
__u64 __user *user_cntd1;
|
|
__u64 kernel_cntd0, kernel_cntd1;
|
|
__u64 pcr_reg;
|
|
|
|
__u64 cee_stuff;
|
|
|
|
struct restart_block restart_block;
|
|
|
|
struct pt_regs *kern_una_regs;
|
|
unsigned int kern_una_insn;
|
|
|
|
unsigned long fpregs[0] __attribute__ ((aligned(64)));
|
|
};
|
|
|
|
#endif /* !(__ASSEMBLY__) */
|
|
|
|
/* offsets into the thread_info struct for assembly code access */
|
|
#define TI_TASK 0x00000000
|
|
#define TI_FLAGS 0x00000008
|
|
#define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
|
|
#define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
|
|
#define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
|
|
#define TI_CURRENT_DS (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
|
|
#define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
|
|
#define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
|
|
#define TI_CPU 0x00000010
|
|
#define TI_FPSAVED 0x00000011
|
|
#define TI_KSP 0x00000018
|
|
#define TI_FAULT_ADDR 0x00000020
|
|
#define TI_KREGS 0x00000028
|
|
#define TI_EXEC_DOMAIN 0x00000030
|
|
#define TI_PRE_COUNT 0x00000038
|
|
#define TI_NEW_CHILD 0x0000003c
|
|
#define TI_SYS_NOERROR 0x0000003d
|
|
#define TI_UTRAPS 0x00000040
|
|
#define TI_REG_WINDOW 0x00000048
|
|
#define TI_RWIN_SPTRS 0x000003c8
|
|
#define TI_GSR 0x00000400
|
|
#define TI_XFSR 0x00000438
|
|
#define TI_USER_CNTD0 0x00000470
|
|
#define TI_USER_CNTD1 0x00000478
|
|
#define TI_KERN_CNTD0 0x00000480
|
|
#define TI_KERN_CNTD1 0x00000488
|
|
#define TI_PCR 0x00000490
|
|
#define TI_CEE_STUFF 0x00000498
|
|
#define TI_RESTART_BLOCK 0x000004a0
|
|
#define TI_KUNA_REGS 0x000004c8
|
|
#define TI_KUNA_INSN 0x000004d0
|
|
#define TI_FPREGS 0x00000500
|
|
|
|
/* We embed this in the uppermost byte of thread_info->flags */
|
|
#define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */
|
|
#define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */
|
|
#define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */
|
|
#define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */
|
|
#define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */
|
|
|
|
#if PAGE_SHIFT == 13
|
|
#define THREAD_SIZE (2*PAGE_SIZE)
|
|
#define THREAD_SHIFT (PAGE_SHIFT + 1)
|
|
#else /* PAGE_SHIFT == 13 */
|
|
#define THREAD_SIZE PAGE_SIZE
|
|
#define THREAD_SHIFT PAGE_SHIFT
|
|
#endif /* PAGE_SHIFT == 13 */
|
|
|
|
#define PREEMPT_ACTIVE 0x4000000
|
|
|
|
/*
|
|
* macros/functions for gaining access to the thread information structure
|
|
*
|
|
* preempt_count needs to be 1 initially, until the scheduler is functional.
|
|
*/
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#define INIT_THREAD_INFO(tsk) \
|
|
{ \
|
|
.task = &tsk, \
|
|
.flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \
|
|
.exec_domain = &default_exec_domain, \
|
|
.preempt_count = 1, \
|
|
.restart_block = { \
|
|
.fn = do_no_restart_syscall, \
|
|
}, \
|
|
}
|
|
|
|
#define init_thread_info (init_thread_union.thread_info)
|
|
#define init_stack (init_thread_union.stack)
|
|
|
|
/* how to get the thread information struct from C */
|
|
register struct thread_info *current_thread_info_reg asm("g6");
|
|
#define current_thread_info() (current_thread_info_reg)
|
|
|
|
/* thread information allocation */
|
|
#if PAGE_SHIFT == 13
|
|
#define __THREAD_INFO_ORDER 1
|
|
#else /* PAGE_SHIFT == 13 */
|
|
#define __THREAD_INFO_ORDER 0
|
|
#endif /* PAGE_SHIFT == 13 */
|
|
|
|
#ifdef CONFIG_DEBUG_STACK_USAGE
|
|
#define alloc_thread_info(tsk) \
|
|
({ \
|
|
struct thread_info *ret; \
|
|
\
|
|
ret = (struct thread_info *) \
|
|
__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER); \
|
|
if (ret) \
|
|
memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \
|
|
ret; \
|
|
})
|
|
#else
|
|
#define alloc_thread_info(tsk) \
|
|
((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
|
|
#endif
|
|
|
|
#define free_thread_info(ti) \
|
|
free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
|
|
|
|
#define __thread_flag_byte_ptr(ti) \
|
|
((unsigned char *)(&((ti)->flags)))
|
|
#define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
|
|
|
|
#define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
|
|
#define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
|
|
#define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
|
|
#define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
|
|
#define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
|
|
#define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
|
|
#define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
|
|
#define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
|
|
#define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
|
|
#define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
|
|
#define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
|
|
#define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
|
|
|
|
#endif /* !(__ASSEMBLY__) */
|
|
|
|
/*
|
|
* Thread information flags, only 16 bits are available as we encode
|
|
* other values into the upper 6 bytes.
|
|
*
|
|
* On trap return we need to test several values:
|
|
*
|
|
* user: need_resched, notify_resume, sigpending, wsaved, perfctr
|
|
* kernel: fpdepth
|
|
*
|
|
* So to check for work in the kernel case we simply load the fpdepth
|
|
* byte out of the flags and test it. For the user case we encode the
|
|
* lower 3 bytes of flags as follows:
|
|
* ----------------------------------------
|
|
* | wsaved | flags byte 1 | flags byte 2 |
|
|
* ----------------------------------------
|
|
* This optimizes the user test into:
|
|
* ldx [%g6 + TI_FLAGS], REG1
|
|
* sethi %hi(_TIF_USER_WORK_MASK), REG2
|
|
* or REG2, %lo(_TIF_USER_WORK_MASK), REG2
|
|
* andcc REG1, REG2, %g0
|
|
* be,pt no_work_to_do
|
|
* nop
|
|
*/
|
|
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
|
|
#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
|
|
#define TIF_SIGPENDING 2 /* signal pending */
|
|
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
|
|
#define TIF_PERFCTR 4 /* performance counters active */
|
|
#define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
|
|
#define TIF_NEWSIGNALS 6 /* wants new-style signals */
|
|
#define TIF_32BIT 7 /* 32-bit binary */
|
|
/* flag bit 8 is available */
|
|
#define TIF_SECCOMP 9 /* secure computing */
|
|
#define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */
|
|
/* flag bit 11 is available */
|
|
/* NOTE: Thread flags >= 12 should be ones we have no interest
|
|
* in using in assembly, else we can't use the mask as
|
|
* an immediate value in instructions such as andcc.
|
|
*/
|
|
#define TIF_ABI_PENDING 12
|
|
#define TIF_MEMDIE 13
|
|
#define TIF_POLLING_NRFLAG 14
|
|
|
|
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
|
|
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
|
|
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
|
|
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
|
|
#define _TIF_PERFCTR (1<<TIF_PERFCTR)
|
|
#define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
|
|
#define _TIF_NEWSIGNALS (1<<TIF_NEWSIGNALS)
|
|
#define _TIF_32BIT (1<<TIF_32BIT)
|
|
#define _TIF_SECCOMP (1<<TIF_SECCOMP)
|
|
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
|
|
#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
|
|
#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
|
|
|
|
#define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
|
|
(_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
|
|
_TIF_NEED_RESCHED | _TIF_PERFCTR))
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_THREAD_INFO_H */
|