| /* Install given context. |
| Copyright (C) 2008 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by David S. Miller <davem@davemloft.net>, 2008. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <sysdep.h> |
| #include <sys/trap.h> |
| |
| #include "ucontext_i.h" |
| |
| |
| /* int __setcontext (const ucontext_t *ucp) |
| |
| Restores the machine context in UCP and thereby resumes execution |
| in that context. |
| |
| This implementation is intended to be used for *synchronous* context |
| switches only. Therefore, it does not have to restore anything |
| other than the PRESERVED state. */ |
| |
| ENTRY(__setcontext) |
| save %sp, -112, %sp |
| |
| mov SIG_SETMASK, %o0 |
| add %i0, UC_SIGMASK, %o1 |
| clr %o2 |
| mov 8, %o3 |
| mov __NR_rt_sigprocmask, %g1 |
| ta 0x10 |
| |
| /* This is a bit on the expensive side, and we could optimize |
| the unwind similar to how the 32-bit sparc longjmp code |
| does if performance of this routine really matters. */ |
| ta ST_FLUSH_WINDOWS |
| |
| ldub [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_EN], %g1 |
| cmp %g1, 0 |
| be 1f |
| nop |
| ld [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_FSR], %fsr |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D0], %f0 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D2], %f2 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D4], %f4 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D6], %f6 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D8], %f8 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D10], %f10 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D12], %f12 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D14], %f14 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D16], %f16 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D18], %f18 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D20], %f20 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D22], %f22 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D24], %f24 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D26], %f26 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D28], %f28 |
| ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D30], %f30 |
| 1: |
| ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_Y], %g1 |
| wr %g1, 0x0, %y |
| |
| /* We specifically do not restore %g1 since we need it here as |
| a temporary. */ |
| ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G2], %g2 |
| ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G3], %g3 |
| ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G4], %g4 |
| ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G5], %g5 |
| ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G6], %g6 |
| ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G7], %g7 |
| ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O1], %i1 |
| ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O2], %i2 |
| ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O3], %i3 |
| ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O4], %i4 |
| ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O5], %i5 |
| ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O6], %i6 |
| restore |
| ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_O7], %o7 |
| ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_PC], %g1 |
| jmpl %g1, %g0 |
| ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_O0], %o0 |
| END(__setcontext) |
| |
| weak_alias (__setcontext, setcontext) |
| |
| /* This is the helper code which gets called if a function which is |
| registered with 'makecontext' returns. In this case we have to |
| install the context listed in the uc_link element of the context |
| 'makecontext' manipulated at the time of the 'makecontext' call. |
| If the pointer is NULL the process must terminate. */ |
| |
| ENTRY(__start_context) |
| ld [%sp + (16 * 4)], %g1 |
| cmp %g1, 0 |
| be,a 1f |
| clr %o0 |
| call __setcontext |
| mov %g1, %o0 |
| /* If this returns (which can happen if the syscall fails) we'll |
| exit the program with the return error value (-1). */ |
| 1: call HIDDEN_JUMPTARGET(exit) |
| nop |
| /* The 'exit' call should never return. In case it does cause |
| the process to terminate. */ |
| unimp |
| END(__start_context) |
