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Simplification of the signal trampoline and other cleanups.

Browse Source 
o  Remove unused defines from genassym.c that were needed
   by the trampoline.
o  Add load_gs_param function to support.s that catches
   a fault when %gs is loaded with an invalid descriptor.
   The function returns EFAULT in that case.
o  Remove struct trapframe from mcontext_t and replace it
   with the list of registers.
o  Modify sendsig and sigreturn accordingly.

This commit contains a patch by bde.

Reviewed by: luoqi, jdp
This commit is contained in:
Marcel Moolenaar 1999-10-07 12:40:34 +00:00
parent f05e3aac6f
commit 210430fd8d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=51984
16 changed files with 154 additions and 164 deletions
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10
sys/amd64/amd64/genassym.c
View File

@ -148,18 +148,8 @@ main()
printf("#define\tTF_EFLAGS %#x\n", OS(trapframe, tf_eflags));
printf("#define\tSIGF_HANDLER %#x\n", OS(sigframe, sf_ahu.sf_handler));
printf("#define\tSIGF_SIGRET %#x\n", OS(sigframe, sf_sigreturn));
printf("#define\tSIGF_SC %#x\n", OS(osigframe, sf_siginfo.si_sc));
printf("#define\tSIGF_UC %#x\n", OS(sigframe, sf_uc));
printf("#define\tSC_PS %#x\n", OS(osigcontext, sc_ps));
printf("#define\tSC_FS %#x\n", OS(osigcontext, sc_fs));
printf("#define\tSC_GS %#x\n", OS(osigcontext, sc_gs));
printf("#define\tUC_EFLAGS %#x\n",
OS(__ucontext, uc_mcontext.mc_tf.tf_eflags));
printf("#define\tUC_GS %#x\n", OS(__ucontext, uc_mcontext.mc_gs));
printf("#define\tB_READ %#x\n", B_READ);
printf("#define\tENOENT %d\n", ENOENT);
printf("#define\tEFAULT %d\n", EFAULT);

29
sys/amd64/amd64/locore.S
View File

@ -415,37 +415,14 @@ NON_GPROF_ENTRY(prepare_usermode)
*/
NON_GPROF_ENTRY(sigcode)
call SIGF_HANDLER(%esp) /* call signal handler */
movl SIGF_SIGRET(%esp),%eax /* Get sigreturn cookie */
cmpl $0x0ABCDEF0,%eax /* New one? */
jne 3f
/* New signalling code */
lea SIGF_UC(%esp),%eax /* get ucontext */
lea SIGF_UC(%esp),%eax /* get ucontext_t */
pushl %eax
testl $PSL_VM,UC_EFLAGS(%eax)
jne 1f
movl UC_GS(%eax),%gs /* restore %gs */
1:
movl $SYS_sigreturn,%eax
pushl %eax /* junk to fake return addr. */
int $0x80 /* enter kernel with args */
/* on stack */
2:
jmp 2b
/* Old signalling code */
3:
lea SIGF_SC(%esp),%eax /* get sigcontext */
pushl %eax
testl $PSL_VM,SC_PS(%eax)
jne 4f
movl SC_GS(%eax),%gs /* restore %gs */
4:
movl $SYS_osigreturn,%eax
pushl %eax /* junk to fake return addr. */
int $0x80 /* enter kernel with args */
/* on stack */
5:
jmp 5b
1:
jmp 1b
ALIGN_TEXT
_esigcode:

29
sys/amd64/amd64/locore.s
View File

@ -415,37 +415,14 @@ NON_GPROF_ENTRY(prepare_usermode)
*/
NON_GPROF_ENTRY(sigcode)
call SIGF_HANDLER(%esp) /* call signal handler */
movl SIGF_SIGRET(%esp),%eax /* Get sigreturn cookie */
cmpl $0x0ABCDEF0,%eax /* New one? */
jne 3f
/* New signalling code */
lea SIGF_UC(%esp),%eax /* get ucontext */
lea SIGF_UC(%esp),%eax /* get ucontext_t */
pushl %eax
testl $PSL_VM,UC_EFLAGS(%eax)
jne 1f
movl UC_GS(%eax),%gs /* restore %gs */
1:
movl $SYS_sigreturn,%eax
pushl %eax /* junk to fake return addr. */
int $0x80 /* enter kernel with args */
/* on stack */
2:
jmp 2b
/* Old signalling code */
3:
lea SIGF_SC(%esp),%eax /* get sigcontext */
pushl %eax
testl $PSL_VM,SC_PS(%eax)
jne 4f
movl SC_GS(%eax),%gs /* restore %gs */
4:
movl $SYS_osigreturn,%eax
pushl %eax /* junk to fake return addr. */
int $0x80 /* enter kernel with args */
/* on stack */
5:
jmp 5b
1:
jmp 1b
ALIGN_TEXT
_esigcode:

58
sys/amd64/amd64/machdep.c
View File

@ -599,6 +599,7 @@ osendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
regs->tf_ds = _udatasel;
regs->tf_es = _udatasel;
regs->tf_fs = _udatasel;
load_gs(_udatasel);
regs->tf_ss = _udatasel;
}
@ -631,8 +632,8 @@ sendsig(catcher, sig, mask, code)
sf.sf_uc.uc_sigmask = *mask;
sf.sf_uc.uc_stack = psp->ps_sigstk;
sf.sf_uc.uc_mcontext.mc_onstack = onstack;
sf.sf_uc.uc_mcontext.mc_tf = *regs;
sf.sf_uc.uc_mcontext.mc_gs = rgs();
bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(struct trapframe));
/* Allocate and validate space for the signal handler context. */
if ((psp->ps_flags & SAS_ALTSTACK) != 0 && !onstack &&
@ -702,12 +703,12 @@ sendsig(catcher, sig, mask, code)
struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86;
sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
sf.sf_uc.uc_mcontext.mc_tf.tf_fs = tf->tf_vm86_fs;
sf.sf_uc.uc_mcontext.mc_tf.tf_es = tf->tf_vm86_es;
sf.sf_uc.uc_mcontext.mc_tf.tf_ds = tf->tf_vm86_ds;
sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
if (vm86->vm86_has_vme == 0)
sf.sf_uc.uc_mcontext.mc_tf.tf_eflags =
sf.sf_uc.uc_mcontext.mc_eflags =
(tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
(vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
@ -725,8 +726,6 @@ sendsig(catcher, sig, mask, code)
tf->tf_eflags &= ~(PSL_VM|PSL_NT|PSL_T|PSL_VIF|PSL_VIP);
}
sf.sf_sigreturn = 0x0ABCDEF0;
/*
* Copy the sigframe out to the user's stack.
*/
@ -744,6 +743,7 @@ sendsig(catcher, sig, mask, code)
regs->tf_ds = _udatasel;
regs->tf_es = _udatasel;
regs->tf_fs = _udatasel;
load_gs(_udatasel);
regs->tf_ss = _udatasel;
}
@ -767,21 +767,15 @@ osigreturn(p, uap)
} */ *uap;
{
register struct osigcontext *scp;
register struct osigframe *fp;
register struct trapframe *regs = p->p_md.md_regs;
int eflags;
/*
* (XXX old comment) regs->tf_esp points to the return address.
* The user scp pointer is above that.
* The return address is faked in the signal trampoline code
* for consistency.
*/
scp = uap->sigcntxp;
fp = (struct osigframe *)
((caddr_t)scp - offsetof(struct osigframe, sf_siginfo.si_sc));
if ((p->p_flag & P_NEWSIGSET) != 0)
return sigreturn(p, (struct sigreturn_args *)uap);
if (useracc((caddr_t)fp, sizeof (struct osigframe), B_WRITE) == 0)
scp = uap->sigcntxp;
if (useracc((caddr_t)scp, sizeof (struct osigcontext), B_WRITE) == 0)
return(EFAULT);
eflags = scp->sc_ps;
@ -847,6 +841,10 @@ osigreturn(p, uap)
regs->tf_ds = scp->sc_ds;
regs->tf_es = scp->sc_es;
regs->tf_fs = scp->sc_fs;
if (load_gs_param(scp->sc_gs)) {
trapsignal(p, SIGBUS, T_SEGNPFLT);
return (EFAULT);
}
}
/* restore scratch registers */
@ -860,9 +858,6 @@ osigreturn(p, uap)
regs->tf_ss = scp->sc_ss;
regs->tf_isp = scp->sc_isp;
if (useracc((caddr_t)scp, sizeof (*scp), B_WRITE) == 0)
return(EINVAL);
if (scp->sc_onstack & 01)
p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK;
else
@ -888,9 +883,11 @@ sigreturn(p, uap)
ucontext_t *ucp;
int cs, eflags;
p->p_flag |= P_NEWSIGSET;
regs = p->p_md.md_regs;
ucp = uap->sigcntxp;
eflags = ucp->uc_mcontext.mc_tf.tf_eflags;
eflags = ucp->uc_mcontext.mc_eflags;
if (useracc((caddr_t)ucp, sizeof(ucontext_t), B_WRITE) == 0)
return(EFAULT);
@ -920,7 +917,7 @@ sigreturn(p, uap)
vm86->vm86_eflags = eflags; /* save VIF, VIP */
eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
}
*regs = ucp->uc_mcontext.mc_tf;
bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(struct trapframe));
tf->tf_vm86_ds = tf->tf_ds;
tf->tf_vm86_es = tf->tf_es;
tf->tf_vm86_fs = tf->tf_fs;
@ -952,14 +949,17 @@ sigreturn(p, uap)
* hardware check for invalid selectors, excess privilege in
* other selectors, invalid %eip's and invalid %esp's.
*/
cs = ucp->uc_mcontext.mc_tf.tf_cs;
cs = ucp->uc_mcontext.mc_cs;
if (!CS_SECURE(cs)) {
printf("sigreturn: cs = 0x%x\n", cs);
trapsignal(p, SIGBUS, T_PROTFLT);
return(EINVAL);
}
*regs = ucp->uc_mcontext.mc_tf;
bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(struct trapframe));
if (load_gs_param(ucp->uc_mcontext.mc_gs)) {
trapsignal(p, SIGBUS, T_SEGNPFLT);
return (EFAULT);
}
}
if (ucp->uc_mcontext.mc_onstack & 1)
@ -1033,10 +1033,10 @@ setregs(p, entry, stack, ps_strings)
regs->tf_ebx = ps_strings;
/* reset %gs as well */
pcb->pcb_gs = _udatasel;
if (pcb == curpcb) {
if (pcb == curpcb)
load_gs(_udatasel);
}
else
pcb->pcb_gs = _udatasel;
/*
* Initialize the math emulator (if any) for the current process.

15
sys/amd64/amd64/support.S
View File

@ -1586,6 +1586,21 @@ ENTRY(load_cr4)
movl %eax,%cr4
ret
/* int load_gs_param(caddr_t gs) */
ENTRY(load_gs_param)
movl _curpcb,%ecx
movl $load_gs_param_fault,PCB_ONFAULT(%ecx)
movl 4(%esp),%eax
movl %eax,%gs
xor %eax,%eax
movl %eax,PCB_ONFAULT(%ecx)
ret
load_gs_param_fault:
movl _curpcb,%ecx
movl $0,PCB_ONFAULT(%ecx)
movl $EFAULT,%eax
ret
/*****************************************************************************/
/* setjump, longjump */
/*****************************************************************************/

15
sys/amd64/amd64/support.s
View File

@ -1586,6 +1586,21 @@ ENTRY(load_cr4)
movl %eax,%cr4
ret
/* int load_gs_param(caddr_t gs) */
ENTRY(load_gs_param)
movl _curpcb,%ecx
movl $load_gs_param_fault,PCB_ONFAULT(%ecx)
movl 4(%esp),%eax
movl %eax,%gs
xor %eax,%eax
movl %eax,PCB_ONFAULT(%ecx)
ret
load_gs_param_fault:
movl _curpcb,%ecx
movl $0,PCB_ONFAULT(%ecx)
movl $EFAULT,%eax
ret
/*****************************************************************************/
/* setjump, longjump */
/*****************************************************************************/

1
sys/amd64/include/md_var.h
View File

@ -91,6 +91,7 @@ int i586_copyout __P((const void *kaddr, void *udaddr, size_t len));
void i686_pagezero __P((void *addr));
int is_physical_memory __P((vm_offset_t addr));
u_long kvtop __P((void *addr));
int load_gs_param __P((u_int sel));
void setidt __P((int idx, alias_for_inthand_t *func, int typ, int dpl,
int selec));
void swi_vm __P((void));

3
sys/amd64/include/sigframe.h
View File

@ -86,9 +86,8 @@ struct sigframe {
__siginfohandler_t *sf_action;
__sighandler_t *sf_handler;
} sf_ahu;
register_t sf_sigreturn; /* sigreturn to use */
siginfo_t sf_si; /* = *sf_siginfo (SA_SIGINFO case) */
ucontext_t sf_uc; /* = *sf_ucontext */
siginfo_t sf_si; /* = *sf_siginfo (SA_SIGINFO case) */
};
#endif /* !_MACHINE_SIGFRAME_H_ */

21
sys/amd64/include/ucontext.h
View File

@ -35,13 +35,30 @@
typedef struct __mcontext {
/*
* The first 3 fields must match the definition of
* The first 20 fields must match the definition of
* sigcontext. So that we can support sigcontext
* and ucontext_t at the same time.
*/
int mc_onstack; /* XXX - sigcontext compat. */
int mc_gs;
struct trapframe mc_tf;
int mc_fs;
int mc_es;
int mc_ds;
int mc_edi;
int mc_esi;
int mc_ebp;
int mc_isp;
int mc_ebx;
int mc_edx;
int mc_ecx;
int mc_eax;
int mc_trapno;
int mc_err;
int mc_eip;
int mc_cs;
int mc_eflags;
int mc_esp; /* machine state */
int mc_ss;
int mc_fpregs[28]; /* env87 + fpacc87 + u_long */
int __spare__[17];

10
sys/i386/i386/genassym.c
View File

@ -148,18 +148,8 @@ main()
printf("#define\tTF_EFLAGS %#x\n", OS(trapframe, tf_eflags));
printf("#define\tSIGF_HANDLER %#x\n", OS(sigframe, sf_ahu.sf_handler));
printf("#define\tSIGF_SIGRET %#x\n", OS(sigframe, sf_sigreturn));
printf("#define\tSIGF_SC %#x\n", OS(osigframe, sf_siginfo.si_sc));
printf("#define\tSIGF_UC %#x\n", OS(sigframe, sf_uc));
printf("#define\tSC_PS %#x\n", OS(osigcontext, sc_ps));
printf("#define\tSC_FS %#x\n", OS(osigcontext, sc_fs));
printf("#define\tSC_GS %#x\n", OS(osigcontext, sc_gs));
printf("#define\tUC_EFLAGS %#x\n",
OS(__ucontext, uc_mcontext.mc_tf.tf_eflags));
printf("#define\tUC_GS %#x\n", OS(__ucontext, uc_mcontext.mc_gs));
printf("#define\tB_READ %#x\n", B_READ);
printf("#define\tENOENT %d\n", ENOENT);
printf("#define\tEFAULT %d\n", EFAULT);

29
sys/i386/i386/locore.s
View File

@ -415,37 +415,14 @@ NON_GPROF_ENTRY(prepare_usermode)
*/
NON_GPROF_ENTRY(sigcode)
call SIGF_HANDLER(%esp) /* call signal handler */
movl SIGF_SIGRET(%esp),%eax /* Get sigreturn cookie */
cmpl $0x0ABCDEF0,%eax /* New one? */
jne 3f
/* New signalling code */
lea SIGF_UC(%esp),%eax /* get ucontext */
lea SIGF_UC(%esp),%eax /* get ucontext_t */
pushl %eax
testl $PSL_VM,UC_EFLAGS(%eax)
jne 1f
movl UC_GS(%eax),%gs /* restore %gs */
1:
movl $SYS_sigreturn,%eax
pushl %eax /* junk to fake return addr. */
int $0x80 /* enter kernel with args */
/* on stack */
2:
jmp 2b
/* Old signalling code */
3:
lea SIGF_SC(%esp),%eax /* get sigcontext */
pushl %eax
testl $PSL_VM,SC_PS(%eax)
jne 4f
movl SC_GS(%eax),%gs /* restore %gs */
4:
movl $SYS_osigreturn,%eax
pushl %eax /* junk to fake return addr. */
int $0x80 /* enter kernel with args */
/* on stack */
5:
jmp 5b
1:
jmp 1b
ALIGN_TEXT
_esigcode:

58
sys/i386/i386/machdep.c
View File

@ -599,6 +599,7 @@ osendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
regs->tf_ds = _udatasel;
regs->tf_es = _udatasel;
regs->tf_fs = _udatasel;
load_gs(_udatasel);
regs->tf_ss = _udatasel;
}
@ -631,8 +632,8 @@ sendsig(catcher, sig, mask, code)
sf.sf_uc.uc_sigmask = *mask;
sf.sf_uc.uc_stack = psp->ps_sigstk;
sf.sf_uc.uc_mcontext.mc_onstack = onstack;
sf.sf_uc.uc_mcontext.mc_tf = *regs;
sf.sf_uc.uc_mcontext.mc_gs = rgs();
bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(struct trapframe));
/* Allocate and validate space for the signal handler context. */
if ((psp->ps_flags & SAS_ALTSTACK) != 0 && !onstack &&
@ -702,12 +703,12 @@ sendsig(catcher, sig, mask, code)
struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86;
sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
sf.sf_uc.uc_mcontext.mc_tf.tf_fs = tf->tf_vm86_fs;
sf.sf_uc.uc_mcontext.mc_tf.tf_es = tf->tf_vm86_es;
sf.sf_uc.uc_mcontext.mc_tf.tf_ds = tf->tf_vm86_ds;
sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
if (vm86->vm86_has_vme == 0)
sf.sf_uc.uc_mcontext.mc_tf.tf_eflags =
sf.sf_uc.uc_mcontext.mc_eflags =
(tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
(vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
@ -725,8 +726,6 @@ sendsig(catcher, sig, mask, code)
tf->tf_eflags &= ~(PSL_VM|PSL_NT|PSL_T|PSL_VIF|PSL_VIP);
}
sf.sf_sigreturn = 0x0ABCDEF0;
/*
* Copy the sigframe out to the user's stack.
*/
@ -744,6 +743,7 @@ sendsig(catcher, sig, mask, code)
regs->tf_ds = _udatasel;
regs->tf_es = _udatasel;
regs->tf_fs = _udatasel;
load_gs(_udatasel);
regs->tf_ss = _udatasel;
}
@ -767,21 +767,15 @@ osigreturn(p, uap)
} */ *uap;
{
register struct osigcontext *scp;
register struct osigframe *fp;
register struct trapframe *regs = p->p_md.md_regs;
int eflags;
/*
* (XXX old comment) regs->tf_esp points to the return address.
* The user scp pointer is above that.
* The return address is faked in the signal trampoline code
* for consistency.
*/
scp = uap->sigcntxp;
fp = (struct osigframe *)
((caddr_t)scp - offsetof(struct osigframe, sf_siginfo.si_sc));
if ((p->p_flag & P_NEWSIGSET) != 0)
return sigreturn(p, (struct sigreturn_args *)uap);
if (useracc((caddr_t)fp, sizeof (struct osigframe), B_WRITE) == 0)
scp = uap->sigcntxp;
if (useracc((caddr_t)scp, sizeof (struct osigcontext), B_WRITE) == 0)
return(EFAULT);
eflags = scp->sc_ps;
@ -847,6 +841,10 @@ osigreturn(p, uap)
regs->tf_ds = scp->sc_ds;
regs->tf_es = scp->sc_es;
regs->tf_fs = scp->sc_fs;
if (load_gs_param(scp->sc_gs)) {
trapsignal(p, SIGBUS, T_SEGNPFLT);
return (EFAULT);
}
}
/* restore scratch registers */
@ -860,9 +858,6 @@ osigreturn(p, uap)
regs->tf_ss = scp->sc_ss;
regs->tf_isp = scp->sc_isp;
if (useracc((caddr_t)scp, sizeof (*scp), B_WRITE) == 0)
return(EINVAL);
if (scp->sc_onstack & 01)
p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK;
else
@ -888,9 +883,11 @@ sigreturn(p, uap)
ucontext_t *ucp;
int cs, eflags;
p->p_flag |= P_NEWSIGSET;
regs = p->p_md.md_regs;
ucp = uap->sigcntxp;
eflags = ucp->uc_mcontext.mc_tf.tf_eflags;
eflags = ucp->uc_mcontext.mc_eflags;
if (useracc((caddr_t)ucp, sizeof(ucontext_t), B_WRITE) == 0)
return(EFAULT);
@ -920,7 +917,7 @@ sigreturn(p, uap)
vm86->vm86_eflags = eflags; /* save VIF, VIP */
eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
}
*regs = ucp->uc_mcontext.mc_tf;
bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(struct trapframe));
tf->tf_vm86_ds = tf->tf_ds;
tf->tf_vm86_es = tf->tf_es;
tf->tf_vm86_fs = tf->tf_fs;
@ -952,14 +949,17 @@ sigreturn(p, uap)
* hardware check for invalid selectors, excess privilege in
* other selectors, invalid %eip's and invalid %esp's.
*/
cs = ucp->uc_mcontext.mc_tf.tf_cs;
cs = ucp->uc_mcontext.mc_cs;
if (!CS_SECURE(cs)) {
printf("sigreturn: cs = 0x%x\n", cs);
trapsignal(p, SIGBUS, T_PROTFLT);
return(EINVAL);
}
*regs = ucp->uc_mcontext.mc_tf;
bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(struct trapframe));
if (load_gs_param(ucp->uc_mcontext.mc_gs)) {
trapsignal(p, SIGBUS, T_SEGNPFLT);
return (EFAULT);
}
}
if (ucp->uc_mcontext.mc_onstack & 1)
@ -1033,10 +1033,10 @@ setregs(p, entry, stack, ps_strings)
regs->tf_ebx = ps_strings;
/* reset %gs as well */
pcb->pcb_gs = _udatasel;
if (pcb == curpcb) {
if (pcb == curpcb)
load_gs(_udatasel);
}
else
pcb->pcb_gs = _udatasel;
/*
* Initialize the math emulator (if any) for the current process.

15
sys/i386/i386/support.s
View File

@ -1586,6 +1586,21 @@ ENTRY(load_cr4)
movl %eax,%cr4
ret
/* int load_gs_param(caddr_t gs) */
ENTRY(load_gs_param)
movl _curpcb,%ecx
movl $load_gs_param_fault,PCB_ONFAULT(%ecx)
movl 4(%esp),%eax
movl %eax,%gs
xor %eax,%eax
movl %eax,PCB_ONFAULT(%ecx)
ret
load_gs_param_fault:
movl _curpcb,%ecx
movl $0,PCB_ONFAULT(%ecx)
movl $EFAULT,%eax
ret
/*****************************************************************************/
/* setjump, longjump */
/*****************************************************************************/

1
sys/i386/include/md_var.h
View File

@ -91,6 +91,7 @@ int i586_copyout __P((const void *kaddr, void *udaddr, size_t len));
void i686_pagezero __P((void *addr));
int is_physical_memory __P((vm_offset_t addr));
u_long kvtop __P((void *addr));
int load_gs_param __P((u_int sel));
void setidt __P((int idx, alias_for_inthand_t *func, int typ, int dpl,
int selec));
void swi_vm __P((void));

3
sys/i386/include/sigframe.h
View File

@ -86,9 +86,8 @@ struct sigframe {
__siginfohandler_t *sf_action;
__sighandler_t *sf_handler;
} sf_ahu;
register_t sf_sigreturn; /* sigreturn to use */
siginfo_t sf_si; /* = *sf_siginfo (SA_SIGINFO case) */
ucontext_t sf_uc; /* = *sf_ucontext */
siginfo_t sf_si; /* = *sf_siginfo (SA_SIGINFO case) */
};
#endif /* !_MACHINE_SIGFRAME_H_ */

21
sys/i386/include/ucontext.h
View File

@ -35,13 +35,30 @@
typedef struct __mcontext {
/*
* The first 3 fields must match the definition of
* The first 20 fields must match the definition of
* sigcontext. So that we can support sigcontext
* and ucontext_t at the same time.
*/
int mc_onstack; /* XXX - sigcontext compat. */
int mc_gs;
struct trapframe mc_tf;
int mc_fs;
int mc_es;
int mc_ds;
int mc_edi;
int mc_esi;
int mc_ebp;
int mc_isp;
int mc_ebx;
int mc_edx;
int mc_ecx;
int mc_eax;
int mc_trapno;
int mc_err;
int mc_eip;
int mc_cs;
int mc_eflags;
int mc_esp; /* machine state */
int mc_ss;
int mc_fpregs[28]; /* env87 + fpacc87 + u_long */
int __spare__[17];