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/*
* Linux-os.c.
* Form FreeBSD-os.c
* From osf1-os.c,v 1.1 94/03/27 15:30:51 hallgren Exp $
*
* OS-dependent routines. This file (along with os.h) exports an
* OS-independent interface to the operating system VM facilities.
* Suprisingly, this interface looks a lot like the Mach interface
* (but simpler in some places). For some operating systems, a subset
* of these functions will have to be emulated.
*
* This is the OSF1 version. By Sean Hallgren.
* Much hacked by Paul Werkowski
* Morfed from the FreeBSD file by Peter Van Eynde (July 1996)
*
* $Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/lisp/Linux-os.c,v 1.2 1997/06/07 15:25:38 pw Exp $
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*
*/
#include <stdio.h>
#include <sys/param.h>
#include <sys/file.h>
#include <errno.h>
#include "./signal.h"
#include "os.h"
#include "arch.h"
#include "globals.h"
#include "interrupt.h"
#include "lispregs.h"
#include "internals.h"
#include <sys/socket.h>
#include <sys/utsname.h>
#include <sys/types.h>
#include <signal.h>
/* #include <sys/sysinfo.h> */
#include <sys/time.h>
#include <sys/stat.h>
#include <unistd.h>
#include "x86-validate.h"
size_t os_vm_page_size;
#define DPRINTF(t,a) {if(t)fprintf a;}
#undef HAVE_SIGVEC /* defined - now obsolete */
#undef HAVE_SIGACTION /* replacement for SIGVEC */
/* SIGSTKSZ == 40Kb */
#define SIG_STACK_SIZE (SIGSTKSZ/sizeof(double))
/* make sure the stack is 8 byte aligned */
#if defined USE_SIG_STACK
static double estack_buf[SIG_STACK_SIZE];
#endif
void
os_init(void)
{
struct utsname name;
uname(&name);
/* we need this for mmap */
if ((name.release[0]) < '2')
{
printf("Linux version must be later then 2.0.0!\n");
exit(2);
}
#if defined USE_SIG_STACK
static struct sigaltstack estack;
estack.ss_base = (char*)estack_buf; /* this should be ss_sp */
estack.ss_size = SIGSTKSZ;
estack.ss_flags = 0;
if (sigaltstack(&estack, 0) < 0)
perror("sigaltstack");
#endif
#if 0
os_vm_page_size=OS_VM_DEFAULT_PAGESIZE;
#else
os_vm_page_size=getpagesize();
#endif
__setfpucw(0x1372|4|8|16|32); /*no interrupts */
}
int
#if LINUX_VERSION_CODE >= linuxversion(2,1,0)
sc_reg(struct sigcontext *c, int offset)
#else
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{
switch(offset)
{
case 0: return c->eax;
case 2: return c->ecx;
case 4: return c->edx;
case 6: return c->ebx;
case 8: return c->esp;
case 10: return c->ebp;
case 12: return c->esi;
case 14: return c->edi;
}
return 0;
}
void
os_save_context(void)
{
/* Called from interrupt handlers so C stuff knows things set in Lisp
*/
}
void
os_set_context(void)
{
}
int do_mmap(os_vm_address_t *addr, os_vm_size_t len,
int flags)
{
/* we _must_ have the memory where we want it...*/
os_vm_address_t old_addr=*addr;
*addr=mmap(*addr,len,OS_VM_PROT_ALL,flags,-1,0);
if (((old_addr != NULL) && (*addr != old_addr)) ||
(*addr == (os_vm_address_t) -1))
{
fprintf(stderr, "Error in allocating memory, do you have more then 16MB of memory+swap?\n");
perror("mmap");
return 1;
}
return 0;
}
os_vm_address_t
os_validate(os_vm_address_t addr, os_vm_size_t len)
{
int flags = MAP_PRIVATE|MAP_ANONYMOUS;
int oa=addr,olen=len;
if(addr) flags|=MAP_FIXED;
else flags|=MAP_VARIABLE;
DPRINTF(0,(stderr,"os_validate %x %d => ",addr,len));
if (addr)
{
do {
if (len <= 0x1000000 )
{
if (do_mmap(&addr,len,flags))
return NULL;
len=0;
}
else
{
len = len-0x1000000;
if (do_mmap(&addr,0x1000000,flags))
return NULL;
addr+=0x1000000;
}
}
while (len>0);
}
else
{
if(do_mmap(&addr,len,flags))
return NULL;
return addr;
}
DPRINTF(0,(stderr,"%x\n",addr));
return oa;
}
void
os_invalidate(os_vm_address_t addr, os_vm_size_t len)
{
DPRINTF(0,(stderr,"os_invalidate %x %d\n",addr,len));
if(munmap(addr,len) == -1)
perror("munmap");
}
os_vm_address_t
os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
{
if((addr=mmap(addr,len,OS_VM_PROT_ALL,MAP_PRIVATE|MAP_FILE|MAP_FIXED,fd,
(off_t) offset)) == (os_vm_address_t) -1)
perror("mmap");
return addr;
}
void
os_flush_icache(os_vm_address_t address, os_vm_size_t length)
{
}
void
os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
{
if(mprotect(address, length, prot) == -1)
perror("mprotect");
}
static boolean
in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
{
char* beg = (char*)sbeg;
char* end = (char*)sbeg + slen;
char* adr = (char*)a;
return (adr >= beg && adr < end);
}
boolean
valid_addr(os_vm_address_t addr)
{
int ret;
os_vm_address_t newaddr;
newaddr=os_trunc_to_page(addr);
if( in_range_p(addr, READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE)
|| in_range_p(addr, STATIC_SPACE_START , STATIC_SPACE_SIZE )
|| in_range_p(addr, DYNAMIC_0_SPACE_START, DYNAMIC_SPACE_SIZE )
|| in_range_p(addr, DYNAMIC_1_SPACE_START, DYNAMIC_SPACE_SIZE )
|| in_range_p(addr, CONTROL_STACK_START , CONTROL_STACK_SIZE )
|| in_range_p(addr, BINDING_STACK_START , BINDING_STACK_SIZE ))
return TRUE;
return FALSE;
}
static void
sigbus_handler(HANDLER_ARGS)
{
GET_CONTEXT
DPRINTF(1,(stderr,"sigbus:\n")); /* there is no sigbus in linux??? */
#if defined NOTYET
if(!interrupt_maybe_gc(signal, code, context))
#endif
interrupt_handle_now(signal,contextstruct);
}
static void
sigsegv_handler(HANDLER_ARGS)
{
GET_CONTEXT
DPRINTF(0,(stderr,"os_sigsegv\n"));
#if defined NOTYET
if(!interrupt_maybe_gc(signal, code, context))
#endif
interrupt_handle_now(signal,contextstruct);
}
void
os_install_interrupt_handlers(void)
{
interrupt_install_low_level_handler(SIGSEGV,sigsegv_handler);
interrupt_install_low_level_handler(SIGBUS,sigbus_handler);
}
#if 0
/* functions that disapear ! */
#define Force_Fct(fct) int * Force_ ## fct (void) {return &fct;}
Force_Fct(select)
Force_Fct(stat)
Force_Fct(lstat)
Force_Fct(fstat)
Force_Fct(socket)
Force_Fct(connect)
Force_Fct(listen)
Force_Fct(recv)
Force_Fct(accept)
Force_Fct(bind)
#endif