78c2c68dda
The semihosting abi used by nios2 uses the gdb remote protocol filesys errnos. Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
232 lines
6.2 KiB
C
232 lines
6.2 KiB
C
/*
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* Nios II Semihosting syscall interface.
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* This code is derived from m68k-semi.c.
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* The semihosting protocol implemented here is described in the
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* libgloss sources:
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* https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;a=blob;f=libgloss/nios2/nios2-semi.txt;hb=HEAD
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*
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* Copyright (c) 2017-2019 Mentor Graphics
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "exec/gdbstub.h"
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#include "semihosting/syscalls.h"
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#include "semihosting/softmmu-uaccess.h"
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#include "qemu/log.h"
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#define HOSTED_EXIT 0
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#define HOSTED_INIT_SIM 1
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#define HOSTED_OPEN 2
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#define HOSTED_CLOSE 3
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#define HOSTED_READ 4
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#define HOSTED_WRITE 5
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#define HOSTED_LSEEK 6
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#define HOSTED_RENAME 7
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#define HOSTED_UNLINK 8
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#define HOSTED_STAT 9
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#define HOSTED_FSTAT 10
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#define HOSTED_GETTIMEOFDAY 11
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#define HOSTED_ISATTY 12
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#define HOSTED_SYSTEM 13
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static int host_to_gdb_errno(int err)
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{
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#define E(X) case E##X: return GDB_E##X
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switch (err) {
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E(PERM);
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E(NOENT);
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E(INTR);
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E(BADF);
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E(ACCES);
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E(FAULT);
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E(BUSY);
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E(EXIST);
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E(NODEV);
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E(NOTDIR);
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E(ISDIR);
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E(INVAL);
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E(NFILE);
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E(MFILE);
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E(FBIG);
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E(NOSPC);
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E(SPIPE);
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E(ROFS);
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E(NAMETOOLONG);
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default:
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return GDB_EUNKNOWN;
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}
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#undef E
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}
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static void nios2_semi_u32_cb(CPUState *cs, uint64_t ret, int err)
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{
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Nios2CPU *cpu = NIOS2_CPU(cs);
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CPUNios2State *env = &cpu->env;
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target_ulong args = env->regs[R_ARG1];
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if (put_user_u32(ret, args) ||
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put_user_u32(host_to_gdb_errno(err), args + 4)) {
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/*
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* The nios2 semihosting ABI does not provide any way to report this
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* error to the guest, so the best we can do is log it in qemu.
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* It is always a guest error not to pass us a valid argument block.
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*/
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qemu_log_mask(LOG_GUEST_ERROR, "nios2-semihosting: return value "
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"discarded because argument block not writable\n");
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}
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}
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static void nios2_semi_u64_cb(CPUState *cs, uint64_t ret, int err)
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{
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Nios2CPU *cpu = NIOS2_CPU(cs);
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CPUNios2State *env = &cpu->env;
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target_ulong args = env->regs[R_ARG1];
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if (put_user_u32(ret >> 32, args) ||
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put_user_u32(ret, args + 4) ||
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put_user_u32(host_to_gdb_errno(err), args + 8)) {
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/* No way to report this via nios2 semihosting ABI; just log it */
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qemu_log_mask(LOG_GUEST_ERROR, "nios2-semihosting: return value "
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"discarded because argument block not writable\n");
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}
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}
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/*
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* Read the input value from the argument block; fail the semihosting
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* call if the memory read fails.
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*/
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#define GET_ARG(n) do { \
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if (get_user_ual(arg ## n, args + (n) * 4)) { \
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goto failed; \
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} \
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} while (0)
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#define GET_ARG64(n) do { \
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if (get_user_ual(arg ## n, args + (n) * 4)) { \
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goto failed64; \
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} \
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} while (0)
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void do_nios2_semihosting(CPUNios2State *env)
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{
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CPUState *cs = env_cpu(env);
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int nr;
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uint32_t args;
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target_ulong arg0, arg1, arg2, arg3;
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nr = env->regs[R_ARG0];
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args = env->regs[R_ARG1];
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switch (nr) {
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case HOSTED_EXIT:
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gdb_exit(env->regs[R_ARG0]);
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exit(env->regs[R_ARG0]);
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case HOSTED_OPEN:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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GET_ARG(3);
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semihost_sys_open(cs, nios2_semi_u32_cb, arg0, arg1, arg2, arg3);
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break;
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case HOSTED_CLOSE:
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GET_ARG(0);
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semihost_sys_close(cs, nios2_semi_u32_cb, arg0);
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break;
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case HOSTED_READ:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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semihost_sys_read(cs, nios2_semi_u32_cb, arg0, arg1, arg2);
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break;
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case HOSTED_WRITE:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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semihost_sys_write(cs, nios2_semi_u32_cb, arg0, arg1, arg2);
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break;
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case HOSTED_LSEEK:
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GET_ARG64(0);
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GET_ARG64(1);
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GET_ARG64(2);
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GET_ARG64(3);
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semihost_sys_lseek(cs, nios2_semi_u64_cb, arg0,
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deposit64(arg2, arg1, 32, 32), arg3);
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break;
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case HOSTED_RENAME:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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GET_ARG(3);
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semihost_sys_rename(cs, nios2_semi_u32_cb, arg0, arg1, arg2, arg3);
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break;
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case HOSTED_UNLINK:
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GET_ARG(0);
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GET_ARG(1);
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semihost_sys_remove(cs, nios2_semi_u32_cb, arg0, arg1);
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break;
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case HOSTED_STAT:
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GET_ARG(0);
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GET_ARG(1);
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GET_ARG(2);
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semihost_sys_stat(cs, nios2_semi_u32_cb, arg0, arg1, arg2);
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break;
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case HOSTED_FSTAT:
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GET_ARG(0);
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GET_ARG(1);
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semihost_sys_fstat(cs, nios2_semi_u32_cb, arg0, arg1);
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break;
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case HOSTED_GETTIMEOFDAY:
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GET_ARG(0);
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GET_ARG(1);
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semihost_sys_gettimeofday(cs, nios2_semi_u32_cb, arg0, arg1);
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break;
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case HOSTED_ISATTY:
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GET_ARG(0);
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semihost_sys_isatty(cs, nios2_semi_u32_cb, arg0);
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break;
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case HOSTED_SYSTEM:
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GET_ARG(0);
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GET_ARG(1);
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semihost_sys_system(cs, nios2_semi_u32_cb, arg0, arg1);
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break;
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default:
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qemu_log_mask(LOG_GUEST_ERROR, "nios2-semihosting: unsupported "
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"semihosting syscall %d\n", nr);
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nios2_semi_u32_cb(cs, -1, ENOSYS);
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break;
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failed:
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nios2_semi_u32_cb(cs, -1, EFAULT);
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break;
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failed64:
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nios2_semi_u64_cb(cs, -1, EFAULT);
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break;
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}
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}
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