1 /* Simulator system call support. 2 3 Copyright 2002-2015 Free Software Foundation, Inc. 4 5 This file is part of simulators. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20 #include "config.h" 21 22 #include <errno.h> 23 24 #include "sim-main.h" 25 #include "sim-syscall.h" 26 #include "targ-vals.h" 27 28 /* Read/write functions for system call interface. */ 29 30 int 31 sim_syscall_read_mem (host_callback *cb ATTRIBUTE_UNUSED, struct cb_syscall *sc, 32 unsigned long taddr, char *buf, int bytes) 33 { 34 SIM_DESC sd = (SIM_DESC) sc->p1; 35 SIM_CPU *cpu = (SIM_CPU *) sc->p2; 36 37 TRACE_MEMORY (cpu, "READ (syscall) %i bytes @ 0x%08lx", bytes, taddr); 38 39 return sim_core_read_buffer (sd, cpu, read_map, buf, taddr, bytes); 40 } 41 42 int 43 sim_syscall_write_mem (host_callback *cb ATTRIBUTE_UNUSED, struct cb_syscall *sc, 44 unsigned long taddr, const char *buf, int bytes) 45 { 46 SIM_DESC sd = (SIM_DESC) sc->p1; 47 SIM_CPU *cpu = (SIM_CPU *) sc->p2; 48 49 TRACE_MEMORY (cpu, "WRITE (syscall) %i bytes @ 0x%08lx", bytes, taddr); 50 51 return sim_core_write_buffer (sd, cpu, write_map, buf, taddr, bytes); 52 } 53 54 /* Main syscall callback for simulators. */ 55 56 void 57 sim_syscall_multi (SIM_CPU *cpu, int func, long arg1, long arg2, long arg3, 58 long arg4, long *result, long *result2, int *errcode) 59 { 60 SIM_DESC sd = CPU_STATE (cpu); 61 host_callback *cb = STATE_CALLBACK (sd); 62 CB_SYSCALL sc; 63 const char unknown_syscall[] = "<UNKNOWN SYSCALL>"; 64 const char *syscall; 65 66 CB_SYSCALL_INIT (&sc); 67 68 sc.func = func; 69 sc.arg1 = arg1; 70 sc.arg2 = arg2; 71 sc.arg3 = arg3; 72 sc.arg4 = arg4; 73 74 sc.p1 = (PTR) sd; 75 sc.p2 = (PTR) cpu; 76 sc.read_mem = sim_syscall_read_mem; 77 sc.write_mem = sim_syscall_write_mem; 78 79 if (cb_syscall (cb, &sc) != CB_RC_OK) 80 { 81 /* The cb_syscall func never returns an error, so this is more of a 82 sanity check. */ 83 sim_engine_abort (sd, cpu, sim_pc_get (cpu), "cb_syscall failed"); 84 } 85 86 syscall = cb_target_str_syscall (cb, func); 87 if (!syscall) 88 syscall = unknown_syscall; 89 90 if (sc.result == -1) 91 TRACE_SYSCALL (cpu, "%s[%i](%#lx, %#lx, %#lx) = %li (error = %s[%i])", 92 syscall, func, arg1, arg2, arg3, sc.result, 93 cb_target_str_errno (cb, sc.errcode), sc.errcode); 94 else 95 TRACE_SYSCALL (cpu, "%s[%i](%#lx, %#lx, %#lx) = %li", 96 syscall, func, arg1, arg2, arg3, sc.result); 97 98 if (cb_target_to_host_syscall (cb, func) == CB_SYS_exit) 99 sim_engine_halt (sd, cpu, NULL, sim_pc_get (cpu), sim_exited, arg1); 100 else if (sc.result == -1) 101 { 102 cb->last_errno = errno; 103 sc.errcode = cb->get_errno (cb); 104 } 105 106 *result = sc.result; 107 *result2 = sc.result2; 108 *errcode = sc.errcode; 109 } 110 111 long 112 sim_syscall (SIM_CPU *cpu, int func, long arg1, long arg2, long arg3, long arg4) 113 { 114 long result, result2; 115 int errcode; 116 117 sim_syscall_multi (cpu, func, arg1, arg2, arg3, arg4, &result, &result2, 118 &errcode); 119 if (result == -1) 120 return -errcode; 121 else 122 return result; 123 } 124