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/* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <ansidecl.h>
#ifndef __GNUC__
#error This file uses GNU C extensions; you must compile with GCC.
#endif
/* Get the definition of `struct sigcontext'. */
#define KERNEL
#define sigvec sun_sigvec
#define sigstack sun_sigstack
#define sigcontext sun_sigcontext
#include "/usr/include/sys/signal.h"
#undef sigvec
#undef sigstack
#undef sigcontext
#undef NSIG
#undef SIGABRT
#undef SIGCLD
#undef SV_ONSTACK
#undef SV_RESETHAND
#undef SV_INTERRUPT
#undef SA_ONSTACK
#undef SA_NOCLDSTOP
#undef SIG_ERR
#undef SIG_DFL
#undef SIG_IGN
#undef sigmask
#undef SIG_BLOCK
#undef SIG_UNBLOCK
#undef SIG_SETMASK
#include <signal.h>
#include <stddef.h>
#include <errno.h>
/* Defined in __sigvec.S. */
extern int EXFUN(__raw_sigvec, (int sig, CONST struct sigvec *vec,
struct sigvec *ovec));
/* User-specified signal handlers. */
#define mytramp 1
#ifdef mytramp
static __sighandler_t handlers[NSIG];
#else
#define handlers _sigfunc
extern __sighandler_t _sigfunc[];
#endif
#if mytramp
/* Handler for all signals that are handled by a user-specified function.
Saves and restores the general regs %g2-%g7, the %y register, and
all the FPU regs (including %fsr), around calling the user's handler. */
static void
DEFUN(trampoline, (sig), int sig)
{
/* We use `double' and `long long int' so `std' (store doubleword) insns,
which might be faster than single-word stores, will be generated. */
register double f0 asm("%f0");
register double f2 asm("%f2");
register double f4 asm("%f4");
register double f6 asm("%f6");
register double f8 asm("%f8");
register double f10 asm("%f10");
register double f12 asm("%f12");
register double f14 asm("%f14");
register double f16 asm("%f16");
register double f18 asm("%f18");
register double f20 asm("%f20");
register double f22 asm("%f22");
register double f24 asm("%f24");
register double f26 asm("%f26");
register double f28 asm("%f28");
register double f30 asm("%f30");
register long long int g2 asm("%g2");
register long long int g4 asm("%g4");
register long long int g6 asm("%g6");
register int *fp asm("%fp");
int code;
register struct sigcontext *context asm("%i0"); /* See end of fn. */
PTR addr;
int y;
double fpsave[16];
int fsr;
int savefpu;
long long int glsave[3];
/* SIG isn't really passed as an arg.
The args to the signal handler are at fp[16..19]. */
sig = fp[16];
code = fp[17];
context = (struct sigcontext *) fp[18];
addr = (PTR) fp[19];
/* Save the Y register. */
asm("rd %%y, %0" : "=r" (y));
/* Save the FPU regs if the FPU enable bit is set in the PSR,
and the signal isn't an FP exception. */
savefpu = (context->sc_psr & 0x1000) && sig != SIGFPE;
if (savefpu)
{
fpsave[0] = f0;
fpsave[1] = f2;
fpsave[2] = f4;
fpsave[3] = f6;
fpsave[4] = f8;
fpsave[5] = f10;
fpsave[6] = f12;
fpsave[7] = f14;
fpsave[8] = f16;
fpsave[9] = f18;
fpsave[10] = f20;
fpsave[11] = f22;
fpsave[12] = f24;
fpsave[13] = f26;
fpsave[14] = f28;
fpsave[15] = f30;
/* Force it into a stack slot so the asm won't barf. Sigh. */
(void) &fsr;
asm("st %%fsr, %0" : "=m" (fsr));
}
/* Save the global registers (except for %g1, which is a scratch reg). */
glsave[0] = g2;
glsave[1] = g4;
glsave[2] = g6;
/* Call the user's handler. */
(*((void EXFUN((*), (int sig, int code, struct sigcontext *context,
PTR addr))) handlers[sig]))
(sig, code, context, addr);
/* Restore the Y register. */
asm("mov %0, %%y" : : "r" (y));
if (savefpu)
{
/* Restore the FPU regs. */
f0 = fpsave[0];
f2 = fpsave[1];
f4 = fpsave[2];
f6 = fpsave[3];
f8 = fpsave[4];
f10 = fpsave[5];
f12 = fpsave[6];
f14 = fpsave[7];
f16 = fpsave[8];
f18 = fpsave[9];
f20 = fpsave[10];
f22 = fpsave[11];
f24 = fpsave[12];
f26 = fpsave[13];
f28 = fpsave[14];
f30 = fpsave[15];
asm("ld %0, %%fsr" : : "m" (fsr));
}
/* Restore the globals. */
g2 = glsave[0];
g4 = glsave[1];
g6 = glsave[2];
/* Unwind a frame, and do a "sigcleanup" system call.
The system call apparently does a return.
I don't know what it's for. Ask Sun. */
asm("restore %%g0, 139, %%g1\n"
"ta 0\n"
"! this should be i0: %0" /* Useless insn that will never be executed, */
/* here to make the compiler happy. */
: /* No outputs. */ :
/* CONTEXT is bound to %i0. We reference it as an input here to make
sure the compiler considers it live at this point, and preserves
the value in that register. The restore makes %i0 become %o0, the
argument to the system call. */
"r" (context));
}
#endif
int
DEFUN(__sigvec, (sig, vec, ovec),
int sig AND CONST struct sigvec *vec AND struct sigvec *ovec)
{
#ifndef mytramp
extern void _sigtramp (int);
#define trampoline _sigtramp
#endif
struct sigvec myvec;
int mask;
__sighandler_t ohandler;
if (sig <= 0 || sig >= NSIG)
{
errno = EINVAL;
return -1;
}
mask = __sigblock(sigmask(sig));
ohandler = handlers[sig];
if (vec != NULL &&
vec->sv_handler != SIG_IGN && vec->sv_handler != SIG_DFL)
{
handlers[sig] = vec->sv_handler;
myvec = *vec;
myvec.sv_handler = trampoline;
vec = &myvec;
}
if (__raw_sigvec(sig, vec, ovec) < 0)
{
int save = errno;
(void) __sigsetmask(mask);
errno = save;
return -1;
}
if (ovec != NULL && ovec->sv_handler == trampoline)
ovec->sv_handler = ohandler;
(void) __sigsetmask(mask);
return 0;
}
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