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Preserve/restore user r/w tpid in mcontext.

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This commit is contained in:
matt 2015-03-24 08:38:29 +00:00
parent fc5db8c0e8
commit d87c4ff51d
2 changed files with 15 additions and 4 deletions
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14
sys/arch/arm/arm/sig_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: sig_machdep.c,v 1.48 2014/08/13 21:10:31 matt Exp $ */
/* $NetBSD: sig_machdep.c,v 1.49 2015/03/24 08:38:29 matt Exp $ */
/*
* Copyright (c) 1994-1998 Mark Brinicombe.
@ -44,7 +44,7 @@
#include <sys/param.h>
__KERNEL_RCSID(0, "$NetBSD: sig_machdep.c,v 1.48 2014/08/13 21:10:31 matt Exp $");
__KERNEL_RCSID(0, "$NetBSD: sig_machdep.c,v 1.49 2015/03/24 08:38:29 matt Exp $");
#include <sys/mount.h> /* XXX only needed by syscallargs.h */
#include <sys/cpu.h>
@ -199,6 +199,11 @@ cpu_getmcontext(struct lwp *l, mcontext_t *mcp, unsigned int *flags)
mcp->_mc_tlsbase = (uintptr_t)l->l_private;
*flags |= _UC_TLSBASE;
#ifdef __PROG32
const struct pcb * const pcb = lwp_getpcb(l);
mcp->_mc_user_tpid = pcb->pcb_user_pid_rw;
#endif
}
int
@ -268,5 +273,10 @@ cpu_setmcontext(struct lwp *l, const mcontext_t *mcp, unsigned int flags)
l->l_sigstk.ss_flags &= ~SS_ONSTACK;
mutex_exit(p->p_lock);
#ifdef __PROG32
struct pcb * const pcb = lwp_getpcb(l);
pcb->pcb_user_pid_rw = mcp->_mc_user_tpid;
#endif
return (0);
}

5
sys/arch/arm/include/mcontext.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: mcontext.h,v 1.17 2015/03/18 21:02:47 joerg Exp $ */
/* $NetBSD: mcontext.h,v 1.18 2015/03/24 08:38:29 matt Exp $ */
/*-
* Copyright (c) 2001, 2002 The NetBSD Foundation, Inc.
@ -95,6 +95,7 @@ typedef struct {
__vfpregset_t __vfpregs;
} __fpu;
__greg_t _mc_tlsbase;
__greg_t _mc_user_tpid;
} mcontext_t, mcontext32_t;
/* Machine-dependent uc_flags */
@ -106,7 +107,7 @@ typedef struct {
#define _UC_TLSBASE 0x00080000
#define _UC_MACHINE_PAD 2 /* Padding appended to ucontext_t */
#define _UC_MACHINE_PAD 1 /* Padding appended to ucontext_t */
#define _UC_MACHINE_SP(uc) ((uc)->uc_mcontext.__gregs[_REG_SP])
#define _UC_MACHINE_PC(uc) ((uc)->uc_mcontext.__gregs[_REG_PC])