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target-xtensa: implement SIMCALL 

Tensilica iss provides support for applications running in freestanding
environment through SIMCALL command. It is used by Tensilica libc to
access argc/argv, for file I/O, etc.

Note that simcalls that accept buffer addresses expect virtual addresses.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Max Filippov 2011-09-06 03:55:47 +04:00 committed by Blue Swirl
parent 5b4e481b04
commit 1ddeaa5d42
5 changed files with 236 additions and 3 deletions
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1
Makefile.target
View File

@ -370,6 +370,7 @@ obj-alpha-y += vga.o cirrus_vga.o
obj-xtensa-y += xtensa_pic.o
obj-xtensa-y += xtensa_sample.o
obj-xtensa-y += xtensa-semi.o
main.o: QEMU_CFLAGS+=$(GPROF_CFLAGS)

4
qemu-options.hx
View File

@ -2396,11 +2396,11 @@ STEXI
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)
"-semihosting semihosting mode\n", QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA)
STEXI
@item -semihosting
@findex -semihosting
Semihosting mode (ARM, M68K only).
Semihosting mode (ARM, M68K, Xtensa only).
ETEXI
DEF("old-param", 0, QEMU_OPTION_old_param,
"-old-param old param mode\n", QEMU_ARCH_ARM)

1
target-xtensa/helpers.h
View File

@ -14,6 +14,7 @@ DEF_HELPER_0(restore_owb, void)
DEF_HELPER_1(movsp, void, i32)
DEF_HELPER_1(wsr_lbeg, void, i32)
DEF_HELPER_1(wsr_lend, void, i32)
DEF_HELPER_1(simcall, void, env)
DEF_HELPER_0(dump_state, void)
#include "def-helper.h"

9
target-xtensa/translate.c
View File

@ -35,6 +35,7 @@
#include "disas.h"
#include "tcg-op.h"
#include "qemu-log.h"
#include "sysemu.h"
#include "helpers.h"
#define GEN_HELPER 1
@ -726,7 +727,13 @@ static void disas_xtensa_insn(DisasContext *dc)
break;
case 1: /*SIMCALL*/
TBD();
if (semihosting_enabled) {
gen_check_privilege(dc);
gen_helper_simcall(cpu_env);
} else {
qemu_log("SIMCALL but semihosting is disabled\n");
gen_exception_cause(dc, ILLEGAL_INSTRUCTION_CAUSE);
}
break;
default:

224
xtensa-semi.c Normal file
View File

@ -0,0 +1,224 @@
/*
* Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Open Source and Linux Lab nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <stddef.h>
#include "cpu.h"
#include "dyngen-exec.h"
#include "helpers.h"
#include "qemu-log.h"
enum {
TARGET_SYS_exit = 1,
TARGET_SYS_read = 3,
TARGET_SYS_write = 4,
TARGET_SYS_open = 5,
TARGET_SYS_close = 6,
TARGET_SYS_lseek = 19,
TARGET_SYS_select_one = 29,
TARGET_SYS_argc = 1000,
TARGET_SYS_argv_sz = 1001,
TARGET_SYS_argv = 1002,
TARGET_SYS_memset = 1004,
};
enum {
SELECT_ONE_READ = 1,
SELECT_ONE_WRITE = 2,
SELECT_ONE_EXCEPT = 3,
};
void HELPER(simcall)(CPUState *env)
{
uint32_t *regs = env->regs;
switch (regs[2]) {
case TARGET_SYS_exit:
qemu_log("exit(%d) simcall\n", regs[3]);
exit(regs[3]);
break;
case TARGET_SYS_read:
case TARGET_SYS_write:
{
bool is_write = regs[2] == TARGET_SYS_write;
uint32_t fd = regs[3];
uint32_t vaddr = regs[4];
uint32_t len = regs[5];
while (len > 0) {
target_phys_addr_t paddr =
cpu_get_phys_page_debug(env, vaddr);
uint32_t page_left =
TARGET_PAGE_SIZE - (vaddr & (TARGET_PAGE_SIZE - 1));
uint32_t io_sz = page_left < len ? page_left : len;
target_phys_addr_t sz = io_sz;
void *buf = cpu_physical_memory_map(paddr, &sz, is_write);
if (buf) {
vaddr += io_sz;
len -= io_sz;
regs[2] = is_write ?
write(fd, buf, io_sz) :
read(fd, buf, io_sz);
regs[3] = errno;
cpu_physical_memory_unmap(buf, sz, is_write, sz);
if (regs[2] == -1) {
break;
}
} else {
regs[2] = -1;
regs[3] = EINVAL;
break;
}
}
}
break;
case TARGET_SYS_open:
{
char name[1024];
int rc;
int i;
for (i = 0; i < ARRAY_SIZE(name); ++i) {
rc = cpu_memory_rw_debug(
env, regs[3] + i, (uint8_t *)name + i, 1, 0);
if (rc != 0 || name[i] == 0) {
break;
}
}
if (rc == 0 && i < ARRAY_SIZE(name)) {
regs[2] = open(name, regs[4], regs[5]);
regs[3] = errno;
} else {
regs[2] = -1;
regs[3] = EINVAL;
}
}
break;
case TARGET_SYS_close:
if (regs[3] < 3) {
regs[2] = regs[3] = 0;
} else {
regs[2] = close(regs[3]);
regs[3] = errno;
}
break;
case TARGET_SYS_lseek:
regs[2] = lseek(regs[3], (off_t)(int32_t)regs[4], regs[5]);
regs[3] = errno;
break;
case TARGET_SYS_select_one:
{
uint32_t fd = regs[3];
uint32_t rq = regs[4];
uint32_t target_tv = regs[5];
uint32_t target_tvv[2];
struct timeval tv = {0};
fd_set fdset;
FD_ZERO(&fdset);
FD_SET(fd, &fdset);
if (target_tv) {
cpu_memory_rw_debug(env, target_tv,
(uint8_t *)target_tvv, sizeof(target_tvv), 0);
tv.tv_sec = (int32_t)tswap32(target_tvv[0]);
tv.tv_usec = (int32_t)tswap32(target_tvv[1]);
}
regs[2] = select(fd + 1,
rq == SELECT_ONE_READ ? &fdset : NULL,
rq == SELECT_ONE_WRITE ? &fdset : NULL,
rq == SELECT_ONE_EXCEPT ? &fdset : NULL,
target_tv ? &tv : NULL);
regs[3] = errno;
}
break;
case TARGET_SYS_argc:
regs[2] = 1;
regs[3] = 0;
break;
case TARGET_SYS_argv_sz:
regs[2] = 128;
regs[3] = 0;
break;
case TARGET_SYS_argv:
{
struct Argv {
uint32_t argptr[2];
char text[120];
} argv = {
{0, 0},
"test"
};
argv.argptr[0] = tswap32(regs[3] + offsetof(struct Argv, text));
cpu_memory_rw_debug(
env, regs[3], (uint8_t *)&argv, sizeof(argv), 1);
}
break;
case TARGET_SYS_memset:
{
uint32_t base = regs[3];
uint32_t sz = regs[5];
while (sz) {
target_phys_addr_t len = sz;
void *buf = cpu_physical_memory_map(base, &len, 1);
if (buf && len) {
memset(buf, regs[4], len);
cpu_physical_memory_unmap(buf, len, 1, len);
} else {
len = 1;
}
base += len;
sz -= len;
}
regs[2] = regs[3];
regs[3] = 0;
}
break;
default:
qemu_log("%s(%d): not implemented\n", __func__, regs[2]);
break;
}
}