| /* Copyright (C) 1992, 1997 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Brendan Kehoe (brendan@cs.widener.edu). |
| Also hacked by Ian Lance Taylor (ian@airs.com). |
| |
| 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> |
| |
| /* This function saves all the registers, calls the |
| user function, and then executes a sigreturn system call. The |
| sigreturn call wants the address of a sigcontext structure. This |
| is all hideously system dependent and, for all intents and |
| purposes, undocumented. |
| |
| When we enter here, a3 holds the user's signal handler. We are |
| supposed to fill in the context given in a2, and then pass it and |
| the first two arguments to the user's function. If the user's |
| function returns, we execute a sigreturn system call. |
| |
| The sc_onstack, sc_mask and sc_pc elements of the context are |
| already set by the kernel. For some reason we don't have to save |
| the floating point state or the coprocessor state; the kernel may |
| have saved them for us, or it doesn't use them. */ |
| |
| .set noat |
| ENTRY (__handler) |
| #if 0 |
| /* Store zero and the asm temp reg. */ |
| sw $0, 12(a2) |
| sw AT, 16(a2) |
| |
| /* Put v1 in sc_regs[3]. */ |
| sw v1, 24(a2) |
| |
| /* Save the caller saved registers in sc_regs[8..15]. */ |
| sw t0, 44(a2) |
| sw t1, 48(a2) |
| sw t2, 52(a2) |
| sw t3, 56(a2) |
| sw t4, 60(a2) |
| sw t5, 64(a2) |
| sw t6, 68(a2) |
| sw t7, 72(a2) |
| |
| /* Save the callee saved registers in sc_regs[16..23]. */ |
| sw s0, 76(a2) |
| sw s1, 80(a2) |
| sw s2, 84(a2) |
| sw s3, 88(a2) |
| sw s4, 92(a2) |
| sw s5, 96(a2) |
| sw s6, 100(a2) |
| sw s7, 104(a2) |
| |
| /* Save the code generator registers in sc_regs[24] & sc_regs[25]. */ |
| sw t8, 108(a2) |
| sw t9, 112(a2) |
| |
| /* Save the kernel temp regs in sc_regs[26] & sc_regs[27]. */ |
| sw k0, 116(a2) |
| sw k1, 120(a2) |
| |
| /* Save the global pointer in sc_regs[28]. */ |
| sw gp, 124(a2) |
| |
| /* ... and also the return address in sc_regs[31]. */ |
| sw ra, 136(a2) |
| |
| /* Note: we don't save the stack pointer in sc_regs[29]; |
| instead, we use the one that was already there. */ |
| #if 0 |
| sw sp, 128(a2) |
| #endif |
| |
| /* Save the floating pointer in sc_regs[30]. */ |
| sw fp, 132(a2) |
| |
| /* Save the mul/div stuff in sc_mdlo and sc_mdhi. */ |
| mflo t0 |
| sw t0, 140(a2) |
| mfhi t0 |
| sw t0, 144(a2) |
| |
| #endif |
| /* Move the stack up six. This will save the context. */ |
| addu sp, sp, -24 |
| sw a2, 16(sp) |
| |
| /* Call their handler with the signal, code, and context; note |
| this will clobber the context. */ |
| .set noreorder |
| jal ra, a3 |
| nop |
| .set reorder |
| |
| /* When we come back, restore the context and pass it right |
| on into sigreturn(). */ |
| lw a0, 16(sp) |
| |
| /* Do a sigreturn syscall; this doesn't return. */ |
| li v0, SYS_sigreturn |
| syscall |
| nop |
