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neelimap
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/* syscallI86.h - I86 specific System Call Infrastructure header */
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/*
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* Copyright (c) 2003-2005, 2007-2008, 2012 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,16oct12,scm WIND00376020 - fast system call support...
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01f,14mar08,scm modify saved regs to reflect code changes...
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01e,04may07,zl updated portable library build configuration.
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01d,05may05,zmm Fix SYSCALL_ENTRY_FRAME_SIZE. SPR 108825
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01c,02feb04,jb Fix SPR 93500
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01b,04jan04,jb Adding context to syscall_entry_state
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01a,18sep03,jb written.
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*/
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/*
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DESCRIPTION
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This header contains I86-specific definitions and constants used by
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the System Call Infrastructure library.
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*/
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#ifndef __INCsyscallI86h
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#define __INCsyscallI86h
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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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#if (CPU != PENTIUM)
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/*
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* SYSENTER/SYSEXIT...
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*
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* When SYSENTER called, made from USR Mode (PL3) :
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*
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* IA32_SYSENTER_CS - sysCsSuper
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* IA32_SYSENTER_EIP - address of syscallHandle routine
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* IA32_SYSENTER_ESP - pTcbCurrent->pExcStackBase
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*
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* CS <--- loaded from IA32_SYSENTER_CS (target code segment)
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* RIP <--- loaded from IA32_SYSENTER_EIP (target instruction)
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* SS <--- Computed by adding 8 to IA32_SYSENTER_CS (stack segment)
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* RSP <--- loaded from IA32_SYSENTER_ESP (stack pointer)
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*
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* When SYSEXIT called, made from Kernel Mode (PL0):
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*
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* IA32_SYSENTER_CS - sysCsSuper
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* EDX - return address
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* ECX - user stack
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*
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* CS <--- Computed by adding 16 to IA32_SYSENTER_CS (code segment)
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* RIP <--- loaded from EDX (target instruction)
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* SS <--- Computed by adding 24 to IA32_SYSENTER_CS (stack segment)
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* RSP <--- loaded from ECX (stack pointer)
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*
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* NOTE: When using SYSENTER/SYSEXIT to implement system calls, any
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* additional state that needs to be saved to allow a return to the
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* calling procedure must be saved explicitly by the calling procedure
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* or be predefined through programming conventions.
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*
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*/
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#define SYSCALL_ENTRY_FRAME_SIZE 72 /* size of 'syscall' frame */
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#define INSTR_SYSENTER_SIZE 2 /* size of 'sysenter' instruction */
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#define SYSCALL_STACK_ARGS 8 /* number of arguments passed */
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#else
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#define SYSCALL_ENTRY_FRAME_SIZE 68
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#define SYSCALL_STACK_ARGS 8
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#endif /* (CPU != PENTIUM) */
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#ifndef _ASMLANGUAGE
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/* The call gate/Tss mechanism does the copy for us, this is not needed */
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#define _SYSCALL_USER_SP_CHECK(sp)
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/* typedefs */
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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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*
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* All 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/I86/syscallALib.s.
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*
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*/
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typedef struct syscall_entry_state
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{
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#if (CPU != PENTIUM)
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long esi; /* Saved reg on entry to syscallHandle */
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long edi; /* Saved reg on entry to syscallHandle */
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long ebx; /* Saved reg on entry to syscallHandle */
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void * pc; /* return to stub PC (edx) */
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long * pUStack; /* usr stack pointer (ecx) */
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long cs; /* return address code segment */
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long upc; /* return to caller pc */
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long args[8]; /* argument list */
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long scn; /* System Call Number - Also temp error storage */
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long errNo; /* errno status */
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long eflags; /* EFLAGS */
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#else
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int esi; /* Save reg */
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int edi; /* Save reg */
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int ebx; /* Save reg */
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void * pc; /* return address instruction pointer */
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int cs; /* return address code segment */
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int scn; /* System Call Number - Also temp error storage */
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int upc; /* return to caller pc */
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int args[8]; /* argument list */
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int * pUStack; /* user-mode stack pointer */
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int ss; /* user stack segment */
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#endif /* (CPU != PENTIUM) */
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} SYSCALL_ENTRY_STATE;
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/* Prototype */
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UINT32 sysModGdt (UINT32 offset, UINT32 limit, UINT32 base, UINT32 priority);
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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 /* __INCsyscallI86h */
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