diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
index a5d64d5030..3082e75340 100644
--- a/hw/mips/mips_malta.c
+++ b/hw/mips/mips_malta.c
@@ -53,6 +53,7 @@
#include "qemu/error-report.h"
#include "hw/empty_slot.h"
#include "sysemu/kvm.h"
+#include "exec/semihost.h"
//#define DEBUG_BOARD_INIT
@@ -634,7 +635,13 @@ static void write_bootloader (CPUMIPSState *env, uint8_t *base,
/* Second part of the bootloader */
p = (uint32_t *) (base + 0x580);
- stl_p(p++, 0x24040002); /* addiu a0, zero, 2 */
+
+ if (semihosting_get_argc()) {
+ /* Preserve a0 content as arguments have been passed */
+ stl_p(p++, 0x00000000); /* nop */
+ } else {
+ stl_p(p++, 0x24040002); /* addiu a0, zero, 2 */
+ }
stl_p(p++, 0x3c1d0000 | (((ENVP_ADDR - 64) >> 16) & 0xffff)); /* lui sp, high(ENVP_ADDR) */
stl_p(p++, 0x37bd0000 | ((ENVP_ADDR - 64) & 0xffff)); /* ori sp, sp, low(ENVP_ADDR) */
stl_p(p++, 0x3c050000 | ((ENVP_ADDR >> 16) & 0xffff)); /* lui a1, high(ENVP_ADDR) */
diff --git a/qemu-options.hx b/qemu-options.hx
index 987dbf0a8a..e6e3895918 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -3345,20 +3345,22 @@ Set OpenBIOS nvram @var{variable} to given @var{value} (PPC, SPARC only).
ETEXI
DEF("semihosting", 0, QEMU_OPTION_semihosting,
"-semihosting semihosting mode\n",
- QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32)
+ QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
+ QEMU_ARCH_MIPS)
STEXI
@item -semihosting
@findex -semihosting
-Enable semihosting mode (ARM, M68K, Xtensa only).
+Enable semihosting mode (ARM, M68K, Xtensa, MIPS only).
ETEXI
DEF("semihosting-config", HAS_ARG, QEMU_OPTION_semihosting_config,
"-semihosting-config [enable=on|off][,target=native|gdb|auto][,arg=str[,...]]\n" \
" semihosting configuration\n",
-QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32)
+QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 |
+QEMU_ARCH_MIPS)
STEXI
@item -semihosting-config [enable=on|off][,target=native|gdb|auto][,arg=str[,...]]
@findex -semihosting-config
-Enable and configure semihosting (ARM, M68K, Xtensa only).
+Enable and configure semihosting (ARM, M68K, Xtensa, MIPS only).
@table @option
@item target=@code{native|gdb|auto}
Defines where the semihosting calls will be addressed, to QEMU (@code{native})
diff --git a/target-mips/Makefile.objs b/target-mips/Makefile.objs
index 108fd9b501..bc5ed8511f 100644
--- a/target-mips/Makefile.objs
+++ b/target-mips/Makefile.objs
@@ -1,4 +1,4 @@
obj-y += translate.o dsp_helper.o op_helper.o lmi_helper.o helper.o cpu.o
-obj-y += gdbstub.o msa_helper.o
+obj-y += gdbstub.o msa_helper.o mips-semi.o
obj-$(CONFIG_SOFTMMU) += machine.o
obj-$(CONFIG_KVM) += kvm.o
diff --git a/target-mips/helper.h b/target-mips/helper.h
index 8df98c71b8..2b28e875cf 100644
--- a/target-mips/helper.h
+++ b/target-mips/helper.h
@@ -1,6 +1,8 @@
DEF_HELPER_3(raise_exception_err, noreturn, env, i32, int)
DEF_HELPER_2(raise_exception, noreturn, env, i32)
+DEF_HELPER_1(do_semihosting, void, env)
+
#ifdef TARGET_MIPS64
DEF_HELPER_4(sdl, void, env, tl, tl, int)
DEF_HELPER_4(sdr, void, env, tl, tl, int)
diff --git a/target-mips/mips-semi.c b/target-mips/mips-semi.c
new file mode 100644
index 0000000000..6944e986b6
--- /dev/null
+++ b/target-mips/mips-semi.c
@@ -0,0 +1,336 @@
+/*
+ * 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 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 .
+ */
+
+#include
+#include "cpu.h"
+#include "exec/helper-proto.h"
+#include "exec/softmmu-semi.h"
+#include "exec/semihost.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
+};
+
+static int copy_stat_to_target(CPUMIPSState *env, const struct stat *src,
+ target_ulong vaddr)
+{
+ hwaddr len = sizeof(struct UHIStat);
+ UHIStat *dst = lock_user(VERIFY_WRITE, vaddr, len, 0);
+ if (!dst) {
+ errno = EFAULT;
+ return -1;
+ }
+
+ dst->uhi_st_dev = tswap16(src->st_dev);
+ dst->uhi_st_ino = tswap16(src->st_ino);
+ dst->uhi_st_mode = tswap32(src->st_mode);
+ dst->uhi_st_nlink = tswap16(src->st_nlink);
+ dst->uhi_st_uid = tswap16(src->st_uid);
+ dst->uhi_st_gid = tswap16(src->st_gid);
+ dst->uhi_st_rdev = tswap16(src->st_rdev);
+ dst->uhi_st_size = tswap64(src->st_size);
+ dst->uhi_st_atime = tswap64(src->st_atime);
+ dst->uhi_st_mtime = tswap64(src->st_mtime);
+ dst->uhi_st_ctime = tswap64(src->st_ctime);
+#ifdef _WIN32
+ dst->uhi_st_blksize = 0;
+ dst->uhi_st_blocks = 0;
+#else
+ dst->uhi_st_blksize = tswap64(src->st_blksize);
+ dst->uhi_st_blocks = tswap64(src->st_blocks);
+#endif
+ unlock_user(dst, vaddr, len);
+ return 0;
+}
+
+static int get_open_flags(target_ulong target_flags)
+{
+ int open_flags = 0;
+
+ if (target_flags & UHIOpen_RDWR) {
+ open_flags |= O_RDWR;
+ } else if (target_flags & UHIOpen_WRONLY) {
+ open_flags |= O_WRONLY;
+ } else {
+ open_flags |= O_RDONLY;
+ }
+
+ open_flags |= (target_flags & UHIOpen_APPEND) ? O_APPEND : 0;
+ open_flags |= (target_flags & UHIOpen_CREAT) ? O_CREAT : 0;
+ open_flags |= (target_flags & UHIOpen_TRUNC) ? O_TRUNC : 0;
+ open_flags |= (target_flags & UHIOpen_EXCL) ? O_EXCL : 0;
+
+ return open_flags;
+}
+
+static int write_to_file(CPUMIPSState *env, target_ulong fd, target_ulong vaddr,
+ target_ulong len, target_ulong offset)
+{
+ int num_of_bytes;
+ void *dst = lock_user(VERIFY_READ, vaddr, len, 1);
+ if (!dst) {
+ errno = EFAULT;
+ return -1;
+ }
+
+ if (offset) {
+#ifdef _WIN32
+ num_of_bytes = 0;
+#else
+ num_of_bytes = pwrite(fd, dst, len, offset);
+#endif
+ } else {
+ num_of_bytes = write(fd, dst, len);
+ }
+
+ unlock_user(dst, vaddr, 0);
+ return num_of_bytes;
+}
+
+static int read_from_file(CPUMIPSState *env, target_ulong fd,
+ target_ulong vaddr, target_ulong len,
+ target_ulong offset)
+{
+ int num_of_bytes;
+ void *dst = lock_user(VERIFY_WRITE, vaddr, len, 0);
+ if (!dst) {
+ errno = EFAULT;
+ return -1;
+ }
+
+ if (offset) {
+#ifdef _WIN32
+ num_of_bytes = 0;
+#else
+ num_of_bytes = pread(fd, dst, len, offset);
+#endif
+ } else {
+ num_of_bytes = read(fd, dst, len);
+ }
+
+ unlock_user(dst, vaddr, len);
+ return num_of_bytes;
+}
+
+static int copy_argn_to_target(CPUMIPSState *env, int arg_num,
+ target_ulong vaddr)
+{
+ int strsize = strlen(semihosting_get_arg(arg_num)) + 1;
+ char *dst = lock_user(VERIFY_WRITE, vaddr, strsize, 0);
+ if (!dst) {
+ return -1;
+ }
+
+ strcpy(dst, semihosting_get_arg(arg_num));
+
+ unlock_user(dst, vaddr, strsize);
+ return 0;
+}
+
+#define GET_TARGET_STRING(p, addr) \
+ do { \
+ p = lock_user_string(addr); \
+ if (!p) { \
+ gpr[2] = -1; \
+ gpr[3] = EFAULT; \
+ goto uhi_done; \
+ } \
+ } while (0)
+
+#define FREE_TARGET_STRING(p, gpr) \
+ do { \
+ unlock_user(p, gpr, 0); \
+ } while (0)
+
+void helper_do_semihosting(CPUMIPSState *env)
+{
+ target_ulong *gpr = env->active_tc.gpr;
+ const UHIOp op = gpr[25];
+ char *p, *p2;
+
+ switch (op) {
+ case UHI_exit:
+ qemu_log("UHI(%d): exit(%d)\n", op, (int)gpr[4]);
+ exit(gpr[4]);
+ case UHI_open:
+ GET_TARGET_STRING(p, gpr[4]);
+ if (!strcmp("/dev/stdin", p)) {
+ gpr[2] = 0;
+ } else if (!strcmp("/dev/stdout", p)) {
+ gpr[2] = 1;
+ } else if (!strcmp("/dev/stderr", p)) {
+ gpr[2] = 2;
+ } else {
+ gpr[2] = open(p, get_open_flags(gpr[5]), gpr[6]);
+ gpr[3] = errno;
+ }
+ FREE_TARGET_STRING(p, gpr[4]);
+ break;
+ case UHI_close:
+ if (gpr[4] < 3) {
+ /* ignore closing stdin/stdout/stderr */
+ gpr[2] = 0;
+ goto uhi_done;
+ }
+ gpr[2] = close(gpr[4]);
+ gpr[3] = errno;
+ break;
+ case UHI_read:
+ gpr[2] = read_from_file(env, gpr[4], gpr[5], gpr[6], 0);
+ gpr[3] = errno;
+ break;
+ case UHI_write:
+ gpr[2] = write_to_file(env, gpr[4], gpr[5], gpr[6], 0);
+ gpr[3] = errno;
+ break;
+ case UHI_lseek:
+ gpr[2] = lseek(gpr[4], gpr[5], gpr[6]);
+ gpr[3] = errno;
+ break;
+ case UHI_unlink:
+ GET_TARGET_STRING(p, gpr[4]);
+ gpr[2] = remove(p);
+ gpr[3] = errno;
+ FREE_TARGET_STRING(p, gpr[4]);
+ break;
+ case UHI_fstat:
+ {
+ struct stat sbuf;
+ memset(&sbuf, 0, sizeof(sbuf));
+ gpr[2] = fstat(gpr[4], &sbuf);
+ gpr[3] = errno;
+ if (gpr[2]) {
+ goto uhi_done;
+ }
+ gpr[2] = copy_stat_to_target(env, &sbuf, gpr[5]);
+ gpr[3] = errno;
+ }
+ break;
+ case UHI_argc:
+ gpr[2] = semihosting_get_argc();
+ break;
+ case UHI_argnlen:
+ if (gpr[4] >= semihosting_get_argc()) {
+ gpr[2] = -1;
+ goto uhi_done;
+ }
+ gpr[2] = strlen(semihosting_get_arg(gpr[4]));
+ break;
+ case UHI_argn:
+ if (gpr[4] >= semihosting_get_argc()) {
+ gpr[2] = -1;
+ goto uhi_done;
+ }
+ gpr[2] = copy_argn_to_target(env, gpr[4], gpr[5]);
+ break;
+ case UHI_plog:
+ GET_TARGET_STRING(p, gpr[4]);
+ p2 = strstr(p, "%d");
+ if (p2) {
+ int char_num = p2 - p;
+ char *buf = g_malloc(char_num + 1);
+ strncpy(buf, p, char_num);
+ buf[char_num] = '\0';
+ gpr[2] = printf("%s%d%s", buf, (int)gpr[5], p2 + 2);
+ g_free(buf);
+ } else {
+ gpr[2] = printf("%s", p);
+ }
+ FREE_TARGET_STRING(p, gpr[4]);
+ break;
+ case UHI_assert:
+ GET_TARGET_STRING(p, gpr[4]);
+ GET_TARGET_STRING(p2, gpr[5]);
+ printf("assertion '");
+ printf("\"%s\"", p);
+ printf("': file \"%s\", line %d\n", p2, (int)gpr[6]);
+ FREE_TARGET_STRING(p2, gpr[5]);
+ FREE_TARGET_STRING(p, gpr[4]);
+ abort();
+ break;
+ case UHI_pread:
+ gpr[2] = read_from_file(env, gpr[4], gpr[5], gpr[6], gpr[7]);
+ gpr[3] = errno;
+ break;
+ case UHI_pwrite:
+ gpr[2] = write_to_file(env, gpr[4], gpr[5], gpr[6], gpr[7]);
+ gpr[3] = errno;
+ break;
+#ifndef _WIN32
+ case UHI_link:
+ GET_TARGET_STRING(p, gpr[4]);
+ GET_TARGET_STRING(p2, gpr[5]);
+ gpr[2] = link(p, p2);
+ gpr[3] = errno;
+ FREE_TARGET_STRING(p2, gpr[5]);
+ FREE_TARGET_STRING(p, gpr[4]);
+ break;
+#endif
+ default:
+ fprintf(stderr, "Unknown UHI operation %d\n", op);
+ abort();
+ }
+uhi_done:
+ return;
+}
diff --git a/target-mips/translate.c b/target-mips/translate.c
index 7d9f2dac6b..8547e2d04d 100644
--- a/target-mips/translate.c
+++ b/target-mips/translate.c
@@ -29,6 +29,7 @@
#include "exec/helper-proto.h"
#include "exec/helper-gen.h"
#include "sysemu/kvm.h"
+#include "exec/semihost.h"
#include "trace-tcg.h"
@@ -11549,6 +11550,15 @@ static int decode_extended_mips16_opc (CPUMIPSState *env, DisasContext *ctx)
return 4;
}
+static inline bool is_uhi(int sdbbp_code)
+{
+#ifdef CONFIG_USER_ONLY
+ return false;
+#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)