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Use the context flag bits.

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This commit is contained in:
mycroft 1998-09-11 13:22:45 +00:00
parent 20de87e848
commit a2d9c7ed82
1 changed files with 49 additions and 42 deletions
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91
sys/arch/i386/i386/svr4_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: svr4_machdep.c,v 1.38 1998/09/11 12:50:06 mycroft Exp $ */
/* $NetBSD: svr4_machdep.c,v 1.39 1998/09/11 13:22:45 mycroft Exp $ */
/*-
* Copyright (c) 1994 The NetBSD Foundation, Inc.
@ -138,7 +138,7 @@ svr4_getcontext(p, uc, mask)
/*
* Set the flags
*/
uc->uc_flags = SVR4_UC_ALL;
uc->uc_flags = SVR4_UC_CPU|SVR4_UC_SIGMASK|SVR4_UC_STACK;
}
@ -168,51 +168,57 @@ svr4_setcontext(p, uc)
* What to do with floating point stuff?
*/
/* Restore register context. */
tf = p->p_md.md_regs;
if (uc->uc_flags & SVR4_UC_CPU) {
/* Restore register context. */
tf = p->p_md.md_regs;
#ifdef VM86
if (r[SVR4_X86_EFL] & PSL_VM) {
tf->tf_vm86_gs = r[SVR4_X86_GS];
tf->tf_vm86_fs = r[SVR4_X86_FS];
tf->tf_vm86_es = r[SVR4_X86_ES];
tf->tf_vm86_ds = r[SVR4_X86_DS];
set_vflags(p, r[SVR4_X86_EFL]);
} else
if (r[SVR4_X86_EFL] & PSL_VM) {
tf->tf_vm86_gs = r[SVR4_X86_GS];
tf->tf_vm86_fs = r[SVR4_X86_FS];
tf->tf_vm86_es = r[SVR4_X86_ES];
tf->tf_vm86_ds = r[SVR4_X86_DS];
set_vflags(p, r[SVR4_X86_EFL]);
} else
#endif
{
/*
* Check for security violations. If we're returning to
* protected mode, the CPU will validate the segment registers
* automatically and generate a trap on violations. We handle
* the trap, rather than doing all of the checking here.
*/
if (((r[SVR4_X86_EFL] ^ tf->tf_eflags) & PSL_USERSTATIC) != 0 ||
!USERMODE(r[SVR4_X86_CS], r[SVR4_X86_EFL]))
return (EINVAL);
{
/*
* Check for security violations. If we're returning to
* protected mode, the CPU will validate the segment registers
* automatically and generate a trap on violations. We handle
* the trap, rather than doing all of the checking here.
*/
if (((r[SVR4_X86_EFL] ^ tf->tf_eflags) & PSL_USERSTATIC) != 0 ||
!USERMODE(r[SVR4_X86_CS], r[SVR4_X86_EFL]))
return (EINVAL);
/* %fs and %gs were restored by the trampoline. */
tf->tf_es = r[SVR4_X86_ES];
tf->tf_ds = r[SVR4_X86_DS];
tf->tf_eflags = r[SVR4_X86_EFL];
/* %fs and %gs were restored by the trampoline. */
tf->tf_es = r[SVR4_X86_ES];
tf->tf_ds = r[SVR4_X86_DS];
tf->tf_eflags = r[SVR4_X86_EFL];
}
tf->tf_edi = r[SVR4_X86_EDI];
tf->tf_esi = r[SVR4_X86_ESI];
tf->tf_ebp = r[SVR4_X86_EBP];
tf->tf_ebx = r[SVR4_X86_EBX];
tf->tf_edx = r[SVR4_X86_EDX];
tf->tf_ecx = r[SVR4_X86_ECX];
tf->tf_eax = r[SVR4_X86_EAX];
tf->tf_eip = r[SVR4_X86_EIP];
tf->tf_cs = r[SVR4_X86_CS];
tf->tf_ss = r[SVR4_X86_SS];
tf->tf_esp = r[SVR4_X86_ESP];
}
tf->tf_edi = r[SVR4_X86_EDI];
tf->tf_esi = r[SVR4_X86_ESI];
tf->tf_ebp = r[SVR4_X86_EBP];
tf->tf_ebx = r[SVR4_X86_EBX];
tf->tf_edx = r[SVR4_X86_EDX];
tf->tf_ecx = r[SVR4_X86_ECX];
tf->tf_eax = r[SVR4_X86_EAX];
tf->tf_eip = r[SVR4_X86_EIP];
tf->tf_cs = r[SVR4_X86_CS];
tf->tf_ss = r[SVR4_X86_SS];
tf->tf_esp = r[SVR4_X86_ESP];
/* Restore signal stack. */
svr4_to_native_sigaltstack(&uc->uc_stack, &p->p_sigacts->ps_sigstk);
if (uc->uc_flags & SVR4_UC_STACK) {
/* Restore signal stack. */
svr4_to_native_sigaltstack(&uc->uc_stack, &p->p_sigacts->ps_sigstk);
}
/* Restore signal mask. */
svr4_to_native_sigset(&uc->uc_sigmask, &mask);
(void) sigprocmask1(p, SIG_SETMASK, &mask, 0);
if (uc->uc_flags & SVR4_UC_SIGMASK) {
/* Restore signal mask. */
svr4_to_native_sigset(&uc->uc_sigmask, &mask);
(void) sigprocmask1(p, SIG_SETMASK, &mask, 0);
}
return (EJUSTRETURN);
}
@ -344,7 +350,7 @@ svr4_sendsig(catcher, sig, mask, code)
/* Allocate space for the signal handler context. */
if (onstack)
fp = (struct svr4_sigframe *)((caddr_t)psp->ps_sigstk.ss_sp +
psp->ps_sigstk.ss_size);
psp->ps_sigstk.ss_size);
else
fp = (struct svr4_sigframe *)tf->tf_esp;
fp--;
@ -366,6 +372,7 @@ svr4_sendsig(catcher, sig, mask, code)
frame.sf_sip = &fp->sf_si;
frame.sf_ucp = &fp->sf_uc;
frame.sf_handler = catcher;
#ifdef DEBUG_SVR4
printf("sig = %d, sip %p, ucp = %p, handler = %p\n",
frame.sf_signum, frame.sf_sip, frame.sf_ucp, frame.sf_handler);