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
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@ -53,6 +53,7 @@
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#include "qemu/error-report.h"
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#include "hw/empty_slot.h"
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#include "sysemu/kvm.h"
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#include "exec/semihost.h"
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//#define DEBUG_BOARD_INIT
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@ -634,7 +635,13 @@ static void write_bootloader (CPUMIPSState *env, uint8_t *base,
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/* Second part of the bootloader */
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p = (uint32_t *) (base + 0x580);
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stl_p(p++, 0x24040002); /* addiu a0, zero, 2 */
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if (semihosting_get_argc()) {
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/* Preserve a0 content as arguments have been passed */
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stl_p(p++, 0x00000000); /* nop */
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} else {
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stl_p(p++, 0x24040002); /* addiu a0, zero, 2 */
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}
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stl_p(p++, 0x3c1d0000 | (((ENVP_ADDR - 64) >> 16) & 0xffff)); /* lui sp, high(ENVP_ADDR) */
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stl_p(p++, 0x37bd0000 | ((ENVP_ADDR - 64) & 0xffff)); /* ori sp, sp, low(ENVP_ADDR) */
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stl_p(p++, 0x3c050000 | ((ENVP_ADDR >> 16) & 0xffff)); /* lui a1, high(ENVP_ADDR) */
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@ -3345,20 +3345,22 @@ Set OpenBIOS nvram @var{variable} to given @var{value} (PPC, SPARC only).
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ETEXI
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DEF("semihosting", 0, QEMU_OPTION_semihosting,
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"-semihosting semihosting mode\n",
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QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32)
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QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
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QEMU_ARCH_MIPS)
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STEXI
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@item -semihosting
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@findex -semihosting
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Enable semihosting mode (ARM, M68K, Xtensa only).
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Enable semihosting mode (ARM, M68K, Xtensa, MIPS only).
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ETEXI
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DEF("semihosting-config", HAS_ARG, QEMU_OPTION_semihosting_config,
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"-semihosting-config [enable=on|off][,target=native|gdb|auto][,arg=str[,...]]\n" \
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" semihosting configuration\n",
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QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32)
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QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
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QEMU_ARCH_MIPS)
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STEXI
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@item -semihosting-config [enable=on|off][,target=native|gdb|auto][,arg=str[,...]]
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@findex -semihosting-config
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Enable and configure semihosting (ARM, M68K, Xtensa only).
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Enable and configure semihosting (ARM, M68K, Xtensa, MIPS only).
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@table @option
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@item target=@code{native|gdb|auto}
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Defines where the semihosting calls will be addressed, to QEMU (@code{native})
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@ -1,4 +1,4 @@
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obj-y += translate.o dsp_helper.o op_helper.o lmi_helper.o helper.o cpu.o
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obj-y += gdbstub.o msa_helper.o
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obj-y += gdbstub.o msa_helper.o mips-semi.o
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obj-$(CONFIG_SOFTMMU) += machine.o
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obj-$(CONFIG_KVM) += kvm.o
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@ -1,6 +1,8 @@
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DEF_HELPER_3(raise_exception_err, noreturn, env, i32, int)
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DEF_HELPER_2(raise_exception, noreturn, env, i32)
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DEF_HELPER_1(do_semihosting, void, env)
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#ifdef TARGET_MIPS64
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DEF_HELPER_4(sdl, void, env, tl, tl, int)
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DEF_HELPER_4(sdr, void, env, tl, tl, int)
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@ -0,0 +1,336 @@
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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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@ -29,6 +29,7 @@
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#include "exec/helper-proto.h"
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#include "exec/helper-gen.h"
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#include "sysemu/kvm.h"
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#include "exec/semihost.h"
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#include "trace-tcg.h"
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@ -11549,6 +11550,15 @@ static int decode_extended_mips16_opc (CPUMIPSState *env, DisasContext *ctx)
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return 4;
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}
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static inline bool is_uhi(int sdbbp_code)
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{
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#ifdef CONFIG_USER_ONLY
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return false;
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#else
|
||||
return semihosting_enabled() && sdbbp_code == 1;
|
||||
#endif
|
||||
}
|
||||
|
||||
static int decode_mips16_opc (CPUMIPSState *env, DisasContext *ctx)
|
||||
{
|
||||
int rx, ry;
|
||||
|
|
@ -11848,11 +11858,15 @@ static int decode_mips16_opc (CPUMIPSState *env, DisasContext *ctx)
|
|||
}
|
||||
break;
|
||||
case RR_SDBBP:
|
||||
/* XXX: not clear which exception should be raised
|
||||
* when in debug mode...
|
||||
*/
|
||||
check_insn(ctx, ISA_MIPS32);
|
||||
generate_exception(ctx, EXCP_DBp);
|
||||
if (is_uhi(extract32(ctx->opcode, 5, 6))) {
|
||||
gen_helper_do_semihosting(cpu_env);
|
||||
} else {
|
||||
/* XXX: not clear which exception should be raised
|
||||
* when in debug mode...
|
||||
*/
|
||||
check_insn(ctx, ISA_MIPS32);
|
||||
generate_exception(ctx, EXCP_DBp);
|
||||
}
|
||||
break;
|
||||
case RR_SLT:
|
||||
gen_slt(ctx, OPC_SLT, 24, rx, ry);
|
||||
|
|
@ -12699,11 +12713,15 @@ static void gen_pool16c_insn(DisasContext *ctx)
|
|||
generate_exception(ctx, EXCP_BREAK);
|
||||
break;
|
||||
case SDBBP16:
|
||||
/* XXX: not clear which exception should be raised
|
||||
* when in debug mode...
|
||||
*/
|
||||
check_insn(ctx, ISA_MIPS32);
|
||||
generate_exception(ctx, EXCP_DBp);
|
||||
if (is_uhi(extract32(ctx->opcode, 0, 4))) {
|
||||
gen_helper_do_semihosting(cpu_env);
|
||||
} else {
|
||||
/* XXX: not clear which exception should be raised
|
||||
* when in debug mode...
|
||||
*/
|
||||
check_insn(ctx, ISA_MIPS32);
|
||||
generate_exception(ctx, EXCP_DBp);
|
||||
}
|
||||
break;
|
||||
case JRADDIUSP + 0:
|
||||
case JRADDIUSP + 1:
|
||||
|
|
@ -13067,8 +13085,12 @@ static void gen_pool32axf (CPUMIPSState *env, DisasContext *ctx, int rt, int rs)
|
|||
ctx->bstate = BS_STOP;
|
||||
break;
|
||||
case SDBBP:
|
||||
check_insn(ctx, ISA_MIPS32);
|
||||
generate_exception(ctx, EXCP_DBp);
|
||||
if (is_uhi(extract32(ctx->opcode, 16, 10))) {
|
||||
gen_helper_do_semihosting(cpu_env);
|
||||
} else {
|
||||
check_insn(ctx, ISA_MIPS32);
|
||||
generate_exception(ctx, EXCP_DBp);
|
||||
}
|
||||
break;
|
||||
default:
|
||||
goto pool32axf_invalid;
|
||||
|
|
@ -16460,10 +16482,14 @@ static void decode_opc_special_r6(CPUMIPSState *env, DisasContext *ctx)
|
|||
}
|
||||
break;
|
||||
case R6_OPC_SDBBP:
|
||||
if (ctx->hflags & MIPS_HFLAG_SBRI) {
|
||||
generate_exception(ctx, EXCP_RI);
|
||||
if (is_uhi(extract32(ctx->opcode, 6, 20))) {
|
||||
gen_helper_do_semihosting(cpu_env);
|
||||
} else {
|
||||
generate_exception(ctx, EXCP_DBp);
|
||||
if (ctx->hflags & MIPS_HFLAG_SBRI) {
|
||||
generate_exception(ctx, EXCP_RI);
|
||||
} else {
|
||||
generate_exception(ctx, EXCP_DBp);
|
||||
}
|
||||
}
|
||||
break;
|
||||
#if defined(TARGET_MIPS64)
|
||||
|
|
@ -16833,11 +16859,15 @@ static void decode_opc_special2_legacy(CPUMIPSState *env, DisasContext *ctx)
|
|||
gen_cl(ctx, op1, rd, rs);
|
||||
break;
|
||||
case OPC_SDBBP:
|
||||
/* XXX: not clear which exception should be raised
|
||||
* when in debug mode...
|
||||
*/
|
||||
check_insn(ctx, ISA_MIPS32);
|
||||
generate_exception(ctx, EXCP_DBp);
|
||||
if (is_uhi(extract32(ctx->opcode, 6, 20))) {
|
||||
gen_helper_do_semihosting(cpu_env);
|
||||
} else {
|
||||
/* XXX: not clear which exception should be raised
|
||||
* when in debug mode...
|
||||
*/
|
||||
check_insn(ctx, ISA_MIPS32);
|
||||
generate_exception(ctx, EXCP_DBp);
|
||||
}
|
||||
break;
|
||||
#if defined(TARGET_MIPS64)
|
||||
case OPC_DCLO:
|
||||
|
|
@ -19910,6 +19940,11 @@ void cpu_state_reset(CPUMIPSState *env)
|
|||
restore_flush_mode(env);
|
||||
restore_pamask(env);
|
||||
cs->exception_index = EXCP_NONE;
|
||||
|
||||
if (semihosting_get_argc()) {
|
||||
/* UHI interface can be used to obtain argc and argv */
|
||||
env->active_tc.gpr[4] = -1;
|
||||
}
|
||||
}
|
||||
|
||||
void restore_state_to_opc(CPUMIPSState *env, TranslationBlock *tb, int pc_pos)
|
||||
|
|
|
|||
Loading…
Reference in New Issue