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linux syscall arg gathering, handling, and return.

This commit is contained in:
cgd 1995-02-28 23:18:03 +00:00
parent 0e305fb3f7
commit 727c7f6f71
1 changed files with 69 additions and 1 deletions
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70
sys/arch/i386/i386/trap.c
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@ -1,4 +1,4 @@
/* $NetBSD: trap.c,v 1.67 1995/01/15 03:29:05 mycroft Exp $ */
/* $NetBSD: trap.c,v 1.68 1995/02/28 23:18:03 cgd Exp $ */
#undef DEBUG
#define DEBUG
@ -70,6 +70,10 @@
#ifdef COMPAT_IBCS2
#include <compat/ibcs2/ibcs2_exec.h>
#endif
#ifdef COMPAT_LINUX
#include <sys/exec.h>
#include <compat/linux/linux_syscall.h>
#endif
#include "npx.h"
@ -499,6 +503,13 @@ syscall(frame)
extern int nibcs2_sysent;
extern struct sysent ibcs2_sysent[];
#endif
#ifdef COMPAT_LINUX
extern int nlinux_sysent;
extern struct sysent linux_sysent[];
extern char sigcode[], esigcode[];
extern int linux_error[];
int fromtramp;
#endif
cnt.v_syscall++;
if (ISPL(frame.tf_cs) != SEL_UPL)
@ -533,6 +544,23 @@ syscall(frame)
code = IBCS2_CVT_HIGH_SYSCALL(code);
break;
#endif
#ifdef COMPAT_LINUX
case EMUL_LINUX:
/* XXXX This is really horrible */
if ((char *) opc > ((char *)PS_STRINGS) - (esigcode - sigcode)
&& (char *) opc < (char *) PS_STRINGS) {
nsys = nsysent;
callp = sysent;
fromtramp = 1;
}
else {
nsys = nlinux_sysent;
callp = linux_sysent;
fromtramp = 0;
}
break;
#endif
#ifdef DIAGNOSTIC
default:
panic("invalid p_emul %d", p->p_emul);
@ -541,6 +569,11 @@ syscall(frame)
switch (code) {
case SYS_syscall:
#ifdef COMPAT_LINUX
/* Linux has a special system setup call as number 0 */
if (p->p_emul == EMUL_LINUX && !fromtramp)
break;
#endif
code = fuword(params);
params += sizeof(int);
break;
@ -562,6 +595,36 @@ syscall(frame)
else
callp = &callp[code];
argsize = callp->sy_argsize;
#ifdef COMPAT_LINUX
/* XXX extra if() for every emul type.. */
if (p->p_emul == EMUL_LINUX && !fromtramp) {
/*
* Linux passes the args in ebx, ecx, edx, esi, edi,
* in increasing order.
*/
switch(argsize / sizeof (register_t)) {
default:
/* No Linux syscalls with > 5 arguments */
break;
case 5:
args[4] = frame.tf_edi;
/*FALLTHROUGH*/
case 4:
args[3] = frame.tf_esi;
/*FALLTHROUGH*/
case 3:
args[2] = frame.tf_edx;
/*FALLTHROUGH*/
case 2:
args[1] = frame.tf_ecx;
/*FALLTHROUGH*/
case 1:
args[0] = frame.tf_ebx;
break;
}
}
else
#endif
if (argsize && (error = copyin(params, (caddr_t)args, argsize))) {
#ifdef SYSCALL_DEBUG
scdebug_call(p, code, argsize, args);
@ -613,6 +676,11 @@ syscall(frame)
#ifdef COMPAT_SVR4
if (p->p_emul == EMUL_IBCS2_ELF)
error = svr4_error[error];
#endif
#ifdef COMPAT_LINUX
if (p->p_emul == EMUL_LINUX && !fromtramp) {
error = -linux_error[error];
}
#endif
frame.tf_eax = error;
frame.tf_eflags |= PSL_C; /* carry bit */