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target/arm: use the common interface for WRITE0/WRITEC in arm-semi

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Now we have a common semihosting console interface use that for our
string output. However ARM is currently unique in also supporting
semihosting for linux-user so we need to replicate the API in
linux-user. If other architectures gain this support we can move the
file later.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Alex Bennée 2019-05-14 11:07:15 +01:00
parent 4cb28db99b
commit 0dc077212f
3 changed files with 30 additions and 25 deletions
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2
linux-user/Makefile.objs
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@ -6,4 +6,6 @@ obj-y = main.o syscall.o strace.o mmap.o signal.o \
obj-$(TARGET_HAS_BFLT) += flatload.o
obj-$(TARGET_I386) += vm86.o
obj-$(TARGET_ARM) += arm/nwfpe/
obj-$(TARGET_ARM) += arm/semihost.o
obj-$(TARGET_AARCH64) += arm/semihost.o
obj-$(TARGET_M68K) += m68k-sim.o

24
linux-user/arm/semihost.c Normal file
View File

@ -0,0 +1,24 @@
/*
* ARM Semihosting Console Support
*
* Copyright (c) 2019 Linaro Ltd
*
* Currently ARM is unique in having support for semihosting support
* in linux-user. So for now we implement the common console API but
* just for arm linux-user.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "hw/semihosting/console.h"
#include "qemu.h"
int qemu_semihosting_console_out(CPUArchState *env, target_ulong addr, int len)
{
void *s = lock_user_string(addr);
len = write(STDERR_FILENO, s, len ? len : strlen(s));
unlock_user(s, addr, 0);
return len;
}

29
target/arm/arm-semi.c
View File

@ -27,6 +27,7 @@
#include "cpu.h"
#include "hw/semihosting/semihost.h"
#include "hw/semihosting/console.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
@ -313,32 +314,10 @@ target_ulong do_arm_semihosting(CPUARMState *env)
return set_swi_errno(ts, close(arg0));
}
case TARGET_SYS_WRITEC:
{
char c;
if (get_user_u8(c, args))
/* FIXME - should this error code be -TARGET_EFAULT ? */
return (uint32_t)-1;
/* Write to debug console. stderr is near enough. */
if (use_gdb_syscalls()) {
return arm_gdb_syscall(cpu, arm_semi_cb, "write,2,%x,1", args);
} else {
return write(STDERR_FILENO, &c, 1);
}
}
qemu_semihosting_console_out(env, args, 1);
return 0xdeadbeef;
case TARGET_SYS_WRITE0:
if (!(s = lock_user_string(args)))
/* FIXME - should this error code be -TARGET_EFAULT ? */
return (uint32_t)-1;
len = strlen(s);
if (use_gdb_syscalls()) {
return arm_gdb_syscall(cpu, arm_semi_cb, "write,2,%x,%x",
args, len);
} else {
ret = write(STDERR_FILENO, s, len);
}
unlock_user(s, args, 0);
return ret;
return qemu_semihosting_console_out(env, args, 0);
case TARGET_SYS_WRITE:
GET_ARG(0);
GET_ARG(1);