bsd-user/arm/target_arch_sigtramp.h

   1 /*
   2  *  arm sysarch() system call emulation
   3  *
   4  *  Copyright (c) 2013 Stacey D. Son
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef TARGET_ARCH_SIGTRAMP_H
  21 #define TARGET_ARCH_SIGTRAMP_H
  22
  23 /* Compare to arm/arm/locore.S ENTRY_NP(sigcode) */
  24 static inline abi_long setup_sigtramp(abi_ulong offset, unsigned sigf_uc,
  25         unsigned sys_sigreturn)
  26 {
  27     int i;
  28     uint32_t sys_exit = TARGET_FREEBSD_NR_exit;
  29     uint32_t sigtramp_code[] = {
  30     /* 1 */ 0xE1A0000D,                  /* mov r0, sp */
  31     /* 2 */ 0xE2800000 + sigf_uc,        /* add r0, r0, #SIGF_UC */
  32     /* 3 */ 0xE59F700C,                  /* ldr r7, [pc, #12] */
  33     /* 4 */ 0xEF000000 + sys_sigreturn,  /* swi (SYS_sigreturn) */
  34     /* 5 */ 0xE59F7008,                  /* ldr r7, [pc, #8] */
  35     /* 6 */ 0xEF000000 + sys_exit,       /* swi (SYS_exit)*/
  36     /* 7 */ 0xEAFFFFFA,                  /* b . -16 */
  37     /* 8 */ sys_sigreturn,
  38     /* 9 */ sys_exit
  39     };
  40
  41     G_STATIC_ASSERT(sizeof(sigtramp_code) == TARGET_SZSIGCODE);
  42
  43     for (i = 0; i < 9; i++) {
  44         tswap32s(&sigtramp_code[i]);
  45     }
  46
  47     return memcpy_to_target(offset, sigtramp_code, TARGET_SZSIGCODE);
  48 }
  49 #endif /* TARGET_ARCH_SIGTRAMP_H */