96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
/* syscallArm.h - ARM specific System Call Infrastructure header */
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/*
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* Copyright (c) 2003, 2005, 2007 Wind River Systems, Inc.
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*
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* The right to copy, distribute or otherwise make use of this software
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* may be licensed only pursuant to the terms of an applicable Wind River
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* license agreement.
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*/
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/*
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modification history
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--------------------
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01g,03dec09,cww Moved ARM specific macros from syscallLibP.h
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01f,04may07,zl updated portable library build configuration.
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01e,04mar05,scm _SYSCALL_USER_SP_CHECK break signals alt stack option...
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01d,23feb05,scm re-assign "spare" to user link reg...
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01c,19nov03,cjj replaced pStackLimit by pStackEnd in _SYSCALL_USER_SP_CHECK
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01b,14oct03,scm enhanced, flushed out, and debugging.
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01a,03oct03,jb written.
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*/
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/*
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DESCRIPTION
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This header contains ARM specific definitions and constants used by
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the System Call Infrastructure library.
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*/
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#ifndef __INCsyscallArmh
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#define __INCsyscallArmh
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#ifndef _ASMLANGUAGE
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#include <taskLib.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* defines */
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#define SYSCALL_ENTRY_FRAME_SIZE 52
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#define _SYSCALL_USER_SP_CHECK(sp)
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/* typedefs */
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#ifndef _ASMLANGUAGE
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/*
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* The SYSCALL_ENTRY_STATE structure defines the saved machine state
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* when the system call trap is taken. This information is architecture
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* specific, and is used by the system call dispatcher to restart system
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* calls that have been interrupted by the occurance of signals.
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* System call restart is achieved by restoring the saved state at the
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* time of the system call trap, and re-issuing the system call.
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* Arguments to the system call are saved on the kernel stack, and
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* the address of that array is passed as an argument to the dispatcher.
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* The layout of this structure must exactly match the ordering of members
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* of the system call entry frame in src/arch/arm/syscallALib.s.
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*/
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typedef struct syscall_entry_state
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{
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ULONG args[8]; /* argument list (r0-r3 and sp[0]-sp[3]) */
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ULONG scn; /* System Call Number (SCN) in r12 */
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ULONG statusReg; /* saved Status Register (spsr) */
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INSTR *pc; /* Trap return address (lr) */
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ULONG *pUStack; /* user-mode stack pointer */
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ULONG usrLnk; /* user-mode link register */
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} SYSCALL_ENTRY_STATE;
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#define ARM_RTP_STACK_OFFSET 12 /* ARM pushes r2, SCn, and lr onto */
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/* stack prior to signal handling */
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#define SYSCALL_USER_SP_GET(tid) (char *) \
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(((SYSCALL_ENTRY_STATE *) ((((WIND_TCB *)(tid))->pExcStackBase) - \
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(sizeof(SYSCALL_ENTRY_STATE)+ARM_RTP_STACK_OFFSET)))->pUStack)
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#define SYSCALL_USER_PC_GET(tid) (void *) \
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(((SYSCALL_ENTRY_STATE *) ((((WIND_TCB *)(tid))->pExcStackBase) - \
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(sizeof(SYSCALL_ENTRY_STATE)+ARM_RTP_STACK_OFFSET)))->pc)
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#define SYSCALL_USER_SCN_GET(tid) (int) \
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(((SYSCALL_ENTRY_STATE *) ((((WIND_TCB *)(tid))->pExcStackBase) - \
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(sizeof(SYSCALL_ENTRY_STATE)+ARM_RTP_STACK_OFFSET)))->scn)
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#endif /* _ASMLANGUAGE */
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCsyscallArmh */
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