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target-mips: add Unified Hosting Interface (UHI) support
Add UHI semihosting support for MIPS. QEMU run with "-semihosting" option will alter the behaviour of SDBBP 1 instruction -- UHI operation will be called instead of generating a debug exception. Also tweak Malta's pseudo-bootloader. On CPU reset the $4 register is set to -1 if semihosting arguments are passed to indicate that the UHI operations should be used to obtain input arguments. Signed-off-by: Leon Alrae <leon.alrae@imgtec.com> Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Leon Alrae
parent
ff33476772
commit
3b3c1694cf
6 changed files with 408 additions and 26 deletions
336
target-mips/mips-semi.c
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336
target-mips/mips-semi.c
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/*
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* Unified Hosting Interface syscalls.
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*
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* Copyright (c) 2015 Imagination Technologies
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <sys/stat.h>
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#include "cpu.h"
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#include "exec/helper-proto.h"
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#include "exec/softmmu-semi.h"
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#include "exec/semihost.h"
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typedef enum UHIOp {
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UHI_exit = 1,
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UHI_open = 2,
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UHI_close = 3,
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UHI_read = 4,
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UHI_write = 5,
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UHI_lseek = 6,
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UHI_unlink = 7,
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UHI_fstat = 8,
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UHI_argc = 9,
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UHI_argnlen = 10,
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UHI_argn = 11,
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UHI_plog = 13,
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UHI_assert = 14,
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UHI_pread = 19,
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UHI_pwrite = 20,
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UHI_link = 22
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} UHIOp;
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typedef struct UHIStat {
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int16_t uhi_st_dev;
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uint16_t uhi_st_ino;
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uint32_t uhi_st_mode;
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uint16_t uhi_st_nlink;
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uint16_t uhi_st_uid;
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uint16_t uhi_st_gid;
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int16_t uhi_st_rdev;
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uint64_t uhi_st_size;
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uint64_t uhi_st_atime;
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uint64_t uhi_st_spare1;
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uint64_t uhi_st_mtime;
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uint64_t uhi_st_spare2;
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uint64_t uhi_st_ctime;
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uint64_t uhi_st_spare3;
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uint64_t uhi_st_blksize;
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uint64_t uhi_st_blocks;
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uint64_t uhi_st_spare4[2];
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} UHIStat;
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enum UHIOpenFlags {
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UHIOpen_RDONLY = 0x0,
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UHIOpen_WRONLY = 0x1,
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UHIOpen_RDWR = 0x2,
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UHIOpen_APPEND = 0x8,
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UHIOpen_CREAT = 0x200,
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UHIOpen_TRUNC = 0x400,
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UHIOpen_EXCL = 0x800
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};
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static int copy_stat_to_target(CPUMIPSState *env, const struct stat *src,
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target_ulong vaddr)
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{
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hwaddr len = sizeof(struct UHIStat);
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UHIStat *dst = lock_user(VERIFY_WRITE, vaddr, len, 0);
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if (!dst) {
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errno = EFAULT;
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return -1;
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}
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dst->uhi_st_dev = tswap16(src->st_dev);
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dst->uhi_st_ino = tswap16(src->st_ino);
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dst->uhi_st_mode = tswap32(src->st_mode);
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dst->uhi_st_nlink = tswap16(src->st_nlink);
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dst->uhi_st_uid = tswap16(src->st_uid);
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dst->uhi_st_gid = tswap16(src->st_gid);
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dst->uhi_st_rdev = tswap16(src->st_rdev);
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dst->uhi_st_size = tswap64(src->st_size);
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dst->uhi_st_atime = tswap64(src->st_atime);
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dst->uhi_st_mtime = tswap64(src->st_mtime);
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dst->uhi_st_ctime = tswap64(src->st_ctime);
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#ifdef _WIN32
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dst->uhi_st_blksize = 0;
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dst->uhi_st_blocks = 0;
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#else
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dst->uhi_st_blksize = tswap64(src->st_blksize);
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dst->uhi_st_blocks = tswap64(src->st_blocks);
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#endif
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unlock_user(dst, vaddr, len);
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return 0;
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}
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static int get_open_flags(target_ulong target_flags)
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{
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int open_flags = 0;
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if (target_flags & UHIOpen_RDWR) {
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open_flags |= O_RDWR;
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} else if (target_flags & UHIOpen_WRONLY) {
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open_flags |= O_WRONLY;
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} else {
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open_flags |= O_RDONLY;
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}
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open_flags |= (target_flags & UHIOpen_APPEND) ? O_APPEND : 0;
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open_flags |= (target_flags & UHIOpen_CREAT) ? O_CREAT : 0;
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open_flags |= (target_flags & UHIOpen_TRUNC) ? O_TRUNC : 0;
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open_flags |= (target_flags & UHIOpen_EXCL) ? O_EXCL : 0;
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return open_flags;
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}
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static int write_to_file(CPUMIPSState *env, target_ulong fd, target_ulong vaddr,
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target_ulong len, target_ulong offset)
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{
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int num_of_bytes;
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void *dst = lock_user(VERIFY_READ, vaddr, len, 1);
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if (!dst) {
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errno = EFAULT;
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return -1;
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}
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if (offset) {
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#ifdef _WIN32
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num_of_bytes = 0;
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#else
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num_of_bytes = pwrite(fd, dst, len, offset);
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#endif
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} else {
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num_of_bytes = write(fd, dst, len);
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}
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unlock_user(dst, vaddr, 0);
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return num_of_bytes;
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}
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static int read_from_file(CPUMIPSState *env, target_ulong fd,
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target_ulong vaddr, target_ulong len,
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target_ulong offset)
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{
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int num_of_bytes;
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void *dst = lock_user(VERIFY_WRITE, vaddr, len, 0);
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if (!dst) {
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errno = EFAULT;
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return -1;
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}
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if (offset) {
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#ifdef _WIN32
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num_of_bytes = 0;
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#else
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num_of_bytes = pread(fd, dst, len, offset);
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#endif
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} else {
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num_of_bytes = read(fd, dst, len);
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}
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unlock_user(dst, vaddr, len);
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return num_of_bytes;
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}
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static int copy_argn_to_target(CPUMIPSState *env, int arg_num,
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target_ulong vaddr)
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{
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int strsize = strlen(semihosting_get_arg(arg_num)) + 1;
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char *dst = lock_user(VERIFY_WRITE, vaddr, strsize, 0);
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if (!dst) {
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return -1;
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}
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strcpy(dst, semihosting_get_arg(arg_num));
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unlock_user(dst, vaddr, strsize);
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return 0;
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}
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#define GET_TARGET_STRING(p, addr) \
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do { \
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p = lock_user_string(addr); \
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if (!p) { \
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gpr[2] = -1; \
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gpr[3] = EFAULT; \
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goto uhi_done; \
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} \
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} while (0)
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#define FREE_TARGET_STRING(p, gpr) \
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do { \
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unlock_user(p, gpr, 0); \
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} while (0)
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void helper_do_semihosting(CPUMIPSState *env)
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{
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target_ulong *gpr = env->active_tc.gpr;
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const UHIOp op = gpr[25];
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char *p, *p2;
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switch (op) {
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case UHI_exit:
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qemu_log("UHI(%d): exit(%d)\n", op, (int)gpr[4]);
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exit(gpr[4]);
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case UHI_open:
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GET_TARGET_STRING(p, gpr[4]);
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if (!strcmp("/dev/stdin", p)) {
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gpr[2] = 0;
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} else if (!strcmp("/dev/stdout", p)) {
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gpr[2] = 1;
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} else if (!strcmp("/dev/stderr", p)) {
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gpr[2] = 2;
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} else {
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gpr[2] = open(p, get_open_flags(gpr[5]), gpr[6]);
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gpr[3] = errno;
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}
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FREE_TARGET_STRING(p, gpr[4]);
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break;
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case UHI_close:
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if (gpr[4] < 3) {
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/* ignore closing stdin/stdout/stderr */
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gpr[2] = 0;
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goto uhi_done;
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}
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gpr[2] = close(gpr[4]);
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gpr[3] = errno;
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break;
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case UHI_read:
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gpr[2] = read_from_file(env, gpr[4], gpr[5], gpr[6], 0);
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gpr[3] = errno;
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break;
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case UHI_write:
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gpr[2] = write_to_file(env, gpr[4], gpr[5], gpr[6], 0);
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gpr[3] = errno;
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break;
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case UHI_lseek:
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gpr[2] = lseek(gpr[4], gpr[5], gpr[6]);
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gpr[3] = errno;
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break;
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case UHI_unlink:
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GET_TARGET_STRING(p, gpr[4]);
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gpr[2] = remove(p);
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gpr[3] = errno;
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FREE_TARGET_STRING(p, gpr[4]);
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break;
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case UHI_fstat:
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{
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struct stat sbuf;
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memset(&sbuf, 0, sizeof(sbuf));
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gpr[2] = fstat(gpr[4], &sbuf);
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gpr[3] = errno;
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if (gpr[2]) {
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goto uhi_done;
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}
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gpr[2] = copy_stat_to_target(env, &sbuf, gpr[5]);
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gpr[3] = errno;
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}
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break;
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case UHI_argc:
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gpr[2] = semihosting_get_argc();
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break;
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case UHI_argnlen:
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if (gpr[4] >= semihosting_get_argc()) {
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gpr[2] = -1;
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goto uhi_done;
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}
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gpr[2] = strlen(semihosting_get_arg(gpr[4]));
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break;
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case UHI_argn:
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if (gpr[4] >= semihosting_get_argc()) {
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gpr[2] = -1;
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goto uhi_done;
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}
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gpr[2] = copy_argn_to_target(env, gpr[4], gpr[5]);
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break;
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case UHI_plog:
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GET_TARGET_STRING(p, gpr[4]);
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p2 = strstr(p, "%d");
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if (p2) {
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int char_num = p2 - p;
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char *buf = g_malloc(char_num + 1);
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strncpy(buf, p, char_num);
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buf[char_num] = '\0';
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gpr[2] = printf("%s%d%s", buf, (int)gpr[5], p2 + 2);
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g_free(buf);
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} else {
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gpr[2] = printf("%s", p);
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}
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FREE_TARGET_STRING(p, gpr[4]);
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break;
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case UHI_assert:
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GET_TARGET_STRING(p, gpr[4]);
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GET_TARGET_STRING(p2, gpr[5]);
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printf("assertion '");
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printf("\"%s\"", p);
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printf("': file \"%s\", line %d\n", p2, (int)gpr[6]);
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FREE_TARGET_STRING(p2, gpr[5]);
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FREE_TARGET_STRING(p, gpr[4]);
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abort();
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break;
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case UHI_pread:
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gpr[2] = read_from_file(env, gpr[4], gpr[5], gpr[6], gpr[7]);
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gpr[3] = errno;
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break;
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case UHI_pwrite:
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gpr[2] = write_to_file(env, gpr[4], gpr[5], gpr[6], gpr[7]);
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gpr[3] = errno;
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break;
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#ifndef _WIN32
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case UHI_link:
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GET_TARGET_STRING(p, gpr[4]);
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GET_TARGET_STRING(p2, gpr[5]);
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gpr[2] = link(p, p2);
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gpr[3] = errno;
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FREE_TARGET_STRING(p2, gpr[5]);
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FREE_TARGET_STRING(p, gpr[4]);
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break;
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#endif
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default:
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fprintf(stderr, "Unknown UHI operation %d\n", op);
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abort();
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}
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uhi_done:
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return;
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}
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