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The IRIX usinit(3) function expects a page of memory to be available at

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address 0x200000 (disasembling usinit shows that this address is hardcoded in
libc). It uses it for locks and semaphres.

We therefore allocate this page of memory, to prevent IRIX process from
faulting when thay call usinit(3).
This commit is contained in:
manu 2002-04-20 16:19:22 +00:00
parent 0852b37f15
commit d5ed80d9c6
2 changed files with 32 additions and 3 deletions
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27
sys/compat/irix/irix_exec.c
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@ -1,4 +1,4 @@
/* $NetBSD: irix_exec.c,v 1.13 2002/04/14 21:50:49 manu Exp $ */
/* $NetBSD: irix_exec.c,v 1.14 2002/04/20 16:19:22 manu Exp $ */
/*-
* Copyright (c) 2001-2002 The NetBSD Foundation, Inc.
@ -37,7 +37,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: irix_exec.c,v 1.13 2002/04/14 21:50:49 manu Exp $");
__KERNEL_RCSID(0, "$NetBSD: irix_exec.c,v 1.14 2002/04/20 16:19:22 manu Exp $");
#ifndef ELFSIZE
#define ELFSIZE 32 /* XXX should die */
@ -50,6 +50,8 @@ __KERNEL_RCSID(0, "$NetBSD: irix_exec.c,v 1.13 2002/04/14 21:50:49 manu Exp $");
#include <sys/exec_elf.h>
#include <sys/malloc.h>
#include <uvm/uvm_extern.h>
#include <machine/regnum.h>
#include <compat/common/compat_util.h>
@ -262,7 +264,28 @@ irix_e_proc_exec(p, epp)
struct proc *p;
struct exec_package *epp;
{
int error;
struct exec_vmcmd evc;
irix_e_proc_init(p, p->p_vmspace);
/*
* On IRIX, usinit(3) expects the kernel to prepare one page of
* memory mapped at address 0x200000. It is used for shared
* semaphores and locks.
*/
bzero(&evc, sizeof(evc));
evc.ev_addr = IRIX_SH_ARENA_ADDR;
evc.ev_len = IRIX_SH_ARENA_SZ;
evc.ev_prot = UVM_PROT_RW;
evc.ev_proc = *vmcmd_map_zero;
error = (*evc.ev_proc)(p, &evc);
#ifdef DEBUG_IRIX
printf("irix_e_proc_init(): uvm_map() returned %d\n", error);
if (error != 0)
printf("irix_e_proc_init(): IRIX_SHARED_ARENA map failed ");
#endif
}
/*

8
sys/compat/irix/irix_exec.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: irix_exec.h,v 1.6 2002/04/14 21:50:50 manu Exp $ */
/* $NetBSD: irix_exec.h,v 1.7 2002/04/20 16:19:22 manu Exp $ */
/*-
* Copyright (c) 2001-2002 The NetBSD Foundation, Inc.
@ -43,6 +43,12 @@
#include <sys/exec.h>
#include <sys/exec_elf.h>
#include <machine/vmparam.h>
/* Address and size of shared arena used by usinit(3) on IRIX */
#define IRIX_SH_ARENA_ADDR 0x200000
#define IRIX_SH_ARENA_SZ PAGE_SIZE
/* IRIX specific per-process data */
struct irix_emuldata {
void *ied_sigtramp; /* Address of signal trampoline */