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Change interface between cpu_fork() and proc_trampoline() so that `tf_pc' 

(instead of `tf_npc') contains the user-space return address. This ensures
entering the signal trampoline code correctly in case we take handled
signal during child_return().
This commit is contained in:
pk 2001-12-30 16:41:29 +00:00
parent 95c845e4fc
commit 76634d2635
2 changed files with 10 additions and 8 deletions
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12
sys/arch/sparc/sparc/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.149 2001/12/11 03:46:59 uwe Exp $ */
/* $NetBSD: locore.s,v 1.150 2001/12/30 16:41:29 pk Exp $ */
/*
* Copyright (c) 1996 Paul Kranenburg
@ -4837,14 +4837,14 @@ ENTRY(proc_trampoline)
mov %l1, %o0
/*
* Here we finish up as in syscall, but simplified. We need to
* fiddle pc and npc a bit, as execve() / setregs() will have
* set npc only, anticipating that trap.c will advance past the
* trap instruction; but we bypass that, so we must do it manually.
* Here we finish up as in syscall, but simplified.
* cpu_fork() or sendsig() (if we took a pending signal
* in child_return()) will have set the user-space return
* address in tf_pc. In both cases, %npc should be %pc + 4.
*/
mov PSR_S, %l0 ! user psr (no need to load it)
!?wr %g0, 2, %wim ! %wim = 2
ld [%sp + CCFSZ + 8], %l1 ! pc = tf->tf_npc from execve/fork
ld [%sp + CCFSZ + 4], %l1 ! pc = tf->tf_pc from cpu_fork()
b return_from_syscall
add %l1, 4, %l2 ! npc = pc+4

6
sys/arch/sparc/sparc/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.60 2001/09/10 21:19:25 chris Exp $ */
/* $NetBSD: vm_machdep.c,v 1.61 2001/12/30 16:41:29 pk Exp $ */
/*
* Copyright (c) 1996
@ -266,7 +266,7 @@ cpu_fork(p1, p2, stack, stacksize, func, arg)
/* Duplicate efforts of syscall(), but slightly differently */
if (tf2->tf_global[1] & SYSCALL_G2RFLAG) {
/* jmp %g2 (or %g7, deprecated) on success */
tf2->tf_npc = tf2->tf_global[2];
tf2->tf_pc = tf2->tf_global[2];
} else {
/*
* old system call convention: clear C on success
@ -274,7 +274,9 @@ cpu_fork(p1, p2, stack, stacksize, func, arg)
* returning to user mode.
*/
/*tf2->tf_psr &= ~PSR_C; -* success */
tf2->tf_pc = tf2->tf_npc;
}
/* proc_trampoline() will do npc = pc + 4 */
/* Set return values in child mode */
tf2->tf_out[0] = 0;