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In cpu_fork() set tf_npc as well in case a signal is taken in child_return() 

which will cause the values of tf_pc and tf_npc set here in cpu_fork()
to be restored and used to return to user space from sigreturn() eventually
(before that the tf_pc and tf_npc set in sendsig() will be used in
proc_trampoline()).

Also, the fork system call never uses the SYSCALL_G2RFLAG shortcut, so drop
the code handling that.
This commit is contained in:
pk 2001-12-30 18:52:54 +00:00
parent c6d7884ffd
commit 5237c5fb99
1 changed files with 11 additions and 16 deletions
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19
sys/arch/sparc/sparc/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.61 2001/12/30 16:41:29 pk Exp $ */
/* $NetBSD: vm_machdep.c,v 1.62 2001/12/30 18:52:54 pk Exp $ */
/*
* Copyright (c) 1996
@ -263,20 +263,16 @@ cpu_fork(p1, p2, stack, stacksize, func, arg)
if (stack != NULL)
tf2->tf_out[6] = (u_int)stack + stacksize;
/* Duplicate efforts of syscall(), but slightly differently */
if (tf2->tf_global[1] & SYSCALL_G2RFLAG) {
/* jmp %g2 (or %g7, deprecated) on success */
tf2->tf_pc = tf2->tf_global[2];
} else {
/*
* old system call convention: clear C on success
* note: proc_trampoline() sets a fresh psr when
* returning to user mode.
* The fork system call always uses the old system call
* convention; clear carry and skip trap instruction as
* in syscall().
* note: proc_trampoline() sets a fresh psr when returning
* to user mode.
*/
/*tf2->tf_psr &= ~PSR_C; -* success */
tf2->tf_pc = tf2->tf_npc;
}
/* proc_trampoline() will do npc = pc + 4 */
tf2->tf_npc = tf2->tf_pc + 4;
/* Set return values in child mode */
tf2->tf_out[0] = 0;
@ -291,7 +287,6 @@ cpu_fork(p1, p2, stack, stacksize, func, arg)
npcb->pcb_sp = (int)rp;
npcb->pcb_psr &= ~PSR_CWP; /* Run in window #0 */
npcb->pcb_wim = 1; /* Fence at window #1 */
}
/*