diff options
Diffstat (limited to 'target/mips/tcg/system/mips-semi.c')
| -rw-r--r-- | target/mips/tcg/system/mips-semi.c | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/target/mips/tcg/system/mips-semi.c b/target/mips/tcg/system/mips-semi.c new file mode 100644 index 0000000000..5ba06e9573 --- /dev/null +++ b/target/mips/tcg/system/mips-semi.c @@ -0,0 +1,361 @@ +/* + * Unified Hosting Interface syscalls. + * + * Copyright (c) 2015 Imagination Technologies + * + * This 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. + * + * This 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 this library; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "qemu/osdep.h" +#include "cpu.h" +#include "qemu/log.h" +#include "gdbstub/syscalls.h" +#include "gdbstub/helpers.h" +#include "semihosting/uaccess.h" +#include "semihosting/semihost.h" +#include "semihosting/console.h" +#include "semihosting/syscalls.h" +#include "internal.h" + +typedef enum UHIOp { + UHI_exit = 1, + UHI_open = 2, + UHI_close = 3, + UHI_read = 4, + UHI_write = 5, + UHI_lseek = 6, + UHI_unlink = 7, + UHI_fstat = 8, + UHI_argc = 9, + UHI_argnlen = 10, + UHI_argn = 11, + UHI_plog = 13, + UHI_assert = 14, + UHI_pread = 19, + UHI_pwrite = 20, + UHI_link = 22 +} UHIOp; + +typedef struct UHIStat { + int16_t uhi_st_dev; + uint16_t uhi_st_ino; + uint32_t uhi_st_mode; + uint16_t uhi_st_nlink; + uint16_t uhi_st_uid; + uint16_t uhi_st_gid; + int16_t uhi_st_rdev; + uint64_t uhi_st_size; + uint64_t uhi_st_atime; + uint64_t uhi_st_spare1; + uint64_t uhi_st_mtime; + uint64_t uhi_st_spare2; + uint64_t uhi_st_ctime; + uint64_t uhi_st_spare3; + uint64_t uhi_st_blksize; + uint64_t uhi_st_blocks; + uint64_t uhi_st_spare4[2]; +} UHIStat; + +enum UHIOpenFlags { + UHIOpen_RDONLY = 0x0, + UHIOpen_WRONLY = 0x1, + UHIOpen_RDWR = 0x2, + UHIOpen_APPEND = 0x8, + UHIOpen_CREAT = 0x200, + UHIOpen_TRUNC = 0x400, + UHIOpen_EXCL = 0x800 +}; + +enum UHIErrno { + UHI_EACCESS = 13, + UHI_EAGAIN = 11, + UHI_EBADF = 9, + UHI_EBADMSG = 77, + UHI_EBUSY = 16, + UHI_ECONNRESET = 104, + UHI_EEXIST = 17, + UHI_EFBIG = 27, + UHI_EINTR = 4, + UHI_EINVAL = 22, + UHI_EIO = 5, + UHI_EISDIR = 21, + UHI_ELOOP = 92, + UHI_EMFILE = 24, + UHI_EMLINK = 31, + UHI_ENAMETOOLONG = 91, + UHI_ENETDOWN = 115, + UHI_ENETUNREACH = 114, + UHI_ENFILE = 23, + UHI_ENOBUFS = 105, + UHI_ENOENT = 2, + UHI_ENOMEM = 12, + UHI_ENOSPC = 28, + UHI_ENOSR = 63, + UHI_ENOTCONN = 128, + UHI_ENOTDIR = 20, + UHI_ENXIO = 6, + UHI_EOVERFLOW = 139, + UHI_EPERM = 1, + UHI_EPIPE = 32, + UHI_ERANGE = 34, + UHI_EROFS = 30, + UHI_ESPIPE = 29, + UHI_ETIMEDOUT = 116, + UHI_ETXTBSY = 26, + UHI_EWOULDBLOCK = 11, + UHI_EXDEV = 18, +}; + +static void report_fault(CPUMIPSState *env) +{ + int op = env->active_tc.gpr[25]; + error_report("Fault during UHI operation %d", op); + abort(); +} + +static void uhi_cb(CPUState *cs, uint64_t ret, int err) +{ + CPUMIPSState *env = cpu_env(cs); + +#define E(N) case E##N: err = UHI_E##N; break + + switch (err) { + case 0: + break; + E(PERM); + E(NOENT); + E(INTR); + E(BADF); + E(BUSY); + E(EXIST); + E(NOTDIR); + E(ISDIR); + E(INVAL); + E(NFILE); + E(MFILE); + E(FBIG); + E(NOSPC); + E(SPIPE); + E(ROFS); + E(NAMETOOLONG); + default: + err = UHI_EINVAL; + break; + case EFAULT: + report_fault(env); + } + +#undef E + + env->active_tc.gpr[2] = ret; + env->active_tc.gpr[3] = err; +} + +static void uhi_fstat_cb(CPUState *cs, uint64_t ret, int err) +{ + QEMU_BUILD_BUG_ON(sizeof(UHIStat) < sizeof(struct gdb_stat)); + + if (!err) { + CPUMIPSState *env = cpu_env(cs); + target_ulong addr = env->active_tc.gpr[5]; + UHIStat *dst = lock_user(VERIFY_WRITE, addr, sizeof(UHIStat), 1); + struct gdb_stat s; + + if (!dst) { + report_fault(env); + } + + memcpy(&s, dst, sizeof(struct gdb_stat)); + memset(dst, 0, sizeof(UHIStat)); + + dst->uhi_st_dev = tswap16(be32_to_cpu(s.gdb_st_dev)); + dst->uhi_st_ino = tswap16(be32_to_cpu(s.gdb_st_ino)); + dst->uhi_st_mode = tswap32(be32_to_cpu(s.gdb_st_mode)); + dst->uhi_st_nlink = tswap16(be32_to_cpu(s.gdb_st_nlink)); + dst->uhi_st_uid = tswap16(be32_to_cpu(s.gdb_st_uid)); + dst->uhi_st_gid = tswap16(be32_to_cpu(s.gdb_st_gid)); + dst->uhi_st_rdev = tswap16(be32_to_cpu(s.gdb_st_rdev)); + dst->uhi_st_size = tswap64(be64_to_cpu(s.gdb_st_size)); + dst->uhi_st_atime = tswap64(be32_to_cpu(s.gdb_st_atime)); + dst->uhi_st_mtime = tswap64(be32_to_cpu(s.gdb_st_mtime)); + dst->uhi_st_ctime = tswap64(be32_to_cpu(s.gdb_st_ctime)); + dst->uhi_st_blksize = tswap64(be64_to_cpu(s.gdb_st_blksize)); + dst->uhi_st_blocks = tswap64(be64_to_cpu(s.gdb_st_blocks)); + + unlock_user(dst, addr, sizeof(UHIStat)); + } + + uhi_cb(cs, ret, err); +} + +void mips_semihosting(CPUMIPSState *env) +{ + CPUState *cs = env_cpu(env); + target_ulong *gpr = env->active_tc.gpr; + const UHIOp op = gpr[25]; + char *p; + + switch (op) { + case UHI_exit: + gdb_exit(gpr[4]); + exit(gpr[4]); + + case UHI_open: + { + target_ulong fname = gpr[4]; + int ret = -1; + + p = lock_user_string(fname); + if (!p) { + report_fault(env); + } + if (!strcmp("/dev/stdin", p)) { + ret = 0; + } else if (!strcmp("/dev/stdout", p)) { + ret = 1; + } else if (!strcmp("/dev/stderr", p)) { + ret = 2; + } + unlock_user(p, fname, 0); + + /* FIXME: reusing a guest fd doesn't seem correct. */ + if (ret >= 0) { + gpr[2] = ret; + break; + } + + semihost_sys_open(cs, uhi_cb, fname, 0, gpr[5], gpr[6]); + } + break; + + case UHI_close: + semihost_sys_close(cs, uhi_cb, gpr[4]); + break; + case UHI_read: + semihost_sys_read(cs, uhi_cb, gpr[4], gpr[5], gpr[6]); + break; + case UHI_write: + semihost_sys_write(cs, uhi_cb, gpr[4], gpr[5], gpr[6]); + break; + case UHI_lseek: + semihost_sys_lseek(cs, uhi_cb, gpr[4], gpr[5], gpr[6]); + break; + case UHI_unlink: + semihost_sys_remove(cs, uhi_cb, gpr[4], 0); + break; + case UHI_fstat: + semihost_sys_fstat(cs, uhi_fstat_cb, gpr[4], gpr[5]); + break; + + case UHI_argc: + gpr[2] = semihosting_get_argc(); + break; + case UHI_argnlen: + { + const char *s = semihosting_get_arg(gpr[4]); + gpr[2] = s ? strlen(s) : -1; + } + break; + case UHI_argn: + { + const char *s = semihosting_get_arg(gpr[4]); + target_ulong addr; + size_t len; + + if (!s) { + gpr[2] = -1; + break; + } + len = strlen(s) + 1; + addr = gpr[5]; + p = lock_user(VERIFY_WRITE, addr, len, 0); + if (!p) { + report_fault(env); + } + memcpy(p, s, len); + unlock_user(p, addr, len); + gpr[2] = 0; + } + break; + + case UHI_plog: + { + target_ulong addr = gpr[4]; + ssize_t len = target_strlen(addr); + GString *str; + char *pct_d; + + if (len < 0) { + report_fault(env); + } + p = lock_user(VERIFY_READ, addr, len, 1); + if (!p) { + report_fault(env); + } + + pct_d = strstr(p, "%d"); + if (!pct_d) { + unlock_user(p, addr, 0); + semihost_sys_write(cs, uhi_cb, 2, addr, len); + break; + } + + str = g_string_new_len(p, pct_d - p); + g_string_append_printf(str, "%d%s", (int)gpr[5], pct_d + 2); + unlock_user(p, addr, 0); + + /* + * When we're using gdb, we need a guest address, so + * drop the string onto the stack below the stack pointer. + */ + if (use_gdb_syscalls()) { + addr = gpr[29] - str->len; + p = lock_user(VERIFY_WRITE, addr, str->len, 0); + if (!p) { + report_fault(env); + } + memcpy(p, str->str, str->len); + unlock_user(p, addr, str->len); + semihost_sys_write(cs, uhi_cb, 2, addr, str->len); + } else { + gpr[2] = qemu_semihosting_console_write(str->str, str->len); + } + g_string_free(str, true); + } + break; + + case UHI_assert: + { + const char *msg, *file; + + msg = lock_user_string(gpr[4]); + if (!msg) { + msg = "<EFAULT>"; + } + file = lock_user_string(gpr[5]); + if (!file) { + file = "<EFAULT>"; + } + + error_report("UHI assertion \"%s\": file \"%s\", line %d", + msg, file, (int)gpr[6]); + abort(); + } + + default: + error_report("Unknown UHI operation %d", op); + abort(); + } + return; +} |