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ftmemsim-valgrind/coregrind/x86-linux/core_platform.h
Nicholas Nethercote 05fe123a9e Update copyright notice for 2005 on all relevant files. Don't bother trying 
to be selective about it.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3303
2005-03-12 16:22:54 +00:00

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/*--------------------------------------------------------------------*/
/*--- Platform-specific stuff for the core. ---*/
/*--- x86-linux/core_platform.h ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2000-2005 Nicholas Nethercote
njn25@cam.ac.uk
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
#ifndef __X86_LINUX_CORE_PLATFORM_H
#define __X86_LINUX_CORE_PLATFORM_H
//#include "core_platform_asm.h" // platform-specific asm stuff
//#include "platform_arch.h" // platform-specific tool stuff
/* ---------------------------------------------------------------------
Dealing with registers
------------------------------------------------------------------ */
// Accessors for the ThreadArchState
#define PLATFORM_SYSCALL_NUM guest_EAX
#define PLATFORM_SYSCALL_ARG1 guest_EBX
#define PLATFORM_SYSCALL_ARG2 guest_ECX
#define PLATFORM_SYSCALL_ARG3 guest_EDX
#define PLATFORM_SYSCALL_ARG4 guest_ESI
#define PLATFORM_SYSCALL_ARG5 guest_EDI
#define PLATFORM_SYSCALL_ARG6 guest_EBP
#define PLATFORM_SYSCALL_RET guest_EAX
// Setting a syscall result
#define PLATFORM_SET_SYSCALL_RESULT(regs, val) \
((regs).vex.guest_EAX = (val))
// Setting thread regs and shadow regs from within the core
#define SET_SYSCALL_RETVAL(zztid, zzval) \
SET_THREAD_REG(zztid, zzval, SYSCALL_RET, post_reg_write, \
Vg_CoreSysCall, zztid, O_SYSCALL_RET, sizeof(UWord))
/* ---------------------------------------------------------------------
Exports of vg_ldt.c
------------------------------------------------------------------ */
// XXX: eventually all these should be x86-private, and not visible to the
// core (except maybe do_useseg()?)
/* Simulate the modify_ldt syscall. */
extern Int VG_(sys_modify_ldt) ( ThreadId tid,
Int func, void* ptr, UInt bytecount );
/* Simulate the {get,set}_thread_area syscalls. */
extern Int VG_(sys_set_thread_area) ( ThreadId tid,
vki_modify_ldt_t* info );
extern Int VG_(sys_get_thread_area) ( ThreadId tid,
vki_modify_ldt_t* info );
/* Called from generated code. Given a segment selector and a virtual
address, return a linear address, and do limit checks too. */
extern Addr VG_(do_useseg) ( UInt seg_selector, Addr virtual_addr );
/* ---------------------------------------------------------------------
ucontext stuff
------------------------------------------------------------------ */
#define UCONTEXT_INSTR_PTR(uc) ((uc)->uc_mcontext.eip)
#define UCONTEXT_STACK_PTR(uc) ((uc)->uc_mcontext.esp)
#define UCONTEXT_FRAME_PTR(uc) ((uc)->uc_mcontext.ebp)
#define UCONTEXT_SYSCALL_NUM(uc) ((uc)->uc_mcontext.eax)
#define UCONTEXT_SYSCALL_RET(uc) ((uc)->uc_mcontext.eax)
/* ---------------------------------------------------------------------
mmap() stuff
------------------------------------------------------------------ */
#define PLATFORM_DO_MMAP(ret, start, length, prot, flags, fd, offset) { \
UWord __args[6]; \
\
__args[0] = (UWord)(start); \
__args[1] = (length); \
__args[2] = (prot); \
__args[3] = (flags); \
__args[4] = (fd); \
__args[5] = (offset); \
\
ret = VG_(do_syscall1)(__NR_mmap, (UWord)(&(__args[0])) ); \
} while (0)
#define PLATFORM_GET_MMAP_ARGS(tst, a1, a2, a3, a4, a5, a6) do {\
UInt *arg_block = (UInt*)SYSCALL_ARG1(tst->arch); \
PRE_MEM_READ( "old_mmap(args)", (Addr)arg_block, 6*sizeof(UWord) );\
a1 = arg_block[0]; \
a2 = arg_block[1]; \
a3 = arg_block[2]; \
a4 = arg_block[3]; \
a5 = arg_block[4]; \
a6 = arg_block[5]; \
} while (0)
/* ---------------------------------------------------------------------
Inline asm for atomic operations for use with futexes
Taken from futex-2.2/i386.h
------------------------------------------------------------------ */
/* (C) Matthew Kirkwood <matthew@hairy.beasts.org>
(C) 2002 Rusty Russell IBM <rusty@rustcorp.com.au>
*/
/* Atomic dec: return new value. */
static __inline__ Int __futex_down(Int *counter)
{
Int val;
UChar eqz;
/* Don't decrement if already negative. */
val = *counter;
if (val < 0)
return val;
/* Damn 386: no cmpxchg... */
__asm__ __volatile__(
"lock; decl %0; sete %1"
:"=m" (*counter), "=qm" (eqz)
:"m" (*counter) : "memory");
/* We know if it's zero... */
if (eqz) return 0;
/* Otherwise, we have no way of knowing value. Guess -1 (if
we're wrong we'll spin). */
return -1;
}
/* Atomic inc: return 1 if counter incremented from 0 to 1. */
static __inline__ Int __futex_up(Int *c)
{
Int r = 1;
/* This actually tests if result >= 1. Damn 386. --RR */
__asm__ __volatile__ (
" lock; incl %1\n"
" jg 1f\n"
" decl %0\n"
"1:\n"
: "=q"(r), "=m"(*c) : "0"(r)
);
return r;
}
/* Simple atomic increment. */
static __inline__ void __atomic_inc(Int *c)
{
__asm__ __volatile__(
"lock; incl %0"
:"=m" (*c)
:"m" (*c));
}
/* Commit the write, so it happens before we send the semaphore to
anyone else */
static __inline__ void __futex_commit(void)
{
/* Probably overkill, but some non-Intel clones support
out-of-order stores, according to 2.5.5-pre1's
linux/include/asm-i386/system.h */
__asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory");
}
/* Use libc setjmp/longjmp. longjmp must not restore signal mask
state, but does need to pass though "val". */
#include <setjmp.h> /* for jmp_buf */
#define SETJMP(env) setjmp(env)
#define LONGJMP(env, val) longjmp(env, val)
#endif // __X86_LINUX_CORE_PLATFORM_H
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/
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