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semihosting: add qemu_semihosting_console_inc for SYS_READC

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Provides a blocking call to read a character from the console using
semihosting.chardev, if specified. This takes some careful command
line options to use stdio successfully as the serial ports, monitor
and semihost all want to use stdio. Here's a sample set of command
line options which share stdio between semihost, monitor and serial
ports:

	qemu \
	-chardev stdio,mux=on,id=stdio0 \
	-serial chardev:stdio0 \
	-semihosting-config enable=on,chardev=stdio0 \
	-mon chardev=stdio0,mode=readline

This creates a chardev hooked to stdio and then connects all of the
subsystems to it. A shorter mechanism would be good to hear about.

Signed-off-by: Keith Packard <keithp@keithp.com>
Message-Id: <20191104204230.12249-1-keithp@keithp.com>
[AJB: fixed up deadlock, minor commit title reword]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Tested-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Keith Packard 2019-11-04 12:42:30 -08:00 • committed by Alex Bennée
parent 4ff5ef9e91
commit 8de702cb67
7 changed files with 134 additions and 2 deletions
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16
include/hw/semihosting/console.h
View file

@ -37,6 +37,22 @@ int qemu_semihosting_console_outs(CPUArchState *env, target_ulong s);
*/
void qemu_semihosting_console_outc(CPUArchState *env, target_ulong c);
/**
* qemu_semihosting_console_inc:
* @env: CPUArchState
*
* Receive single character from debug console. This may be the remote
* gdb session if a softmmu guest is currently being debugged. As this
* call may block if no data is available we suspend the CPU and will
* re-execute the instruction when data is there. Therefore two
* conditions must be met:
* - CPUState is synchronized before calling this function
* - pc is only updated once the character is successfully returned
*
* Returns: character read OR cpu_loop_exit!
*/
target_ulong qemu_semihosting_console_inc(CPUArchState *env);
/**
* qemu_semihosting_log_out:
* @s: pointer to string

4
include/hw/semihosting/semihost.h
View file

@ -56,6 +56,9 @@ static inline Chardev *semihosting_get_chardev(void)
{
return NULL;
}
static inline void qemu_semihosting_console_init(void)
{
}
#else /* !CONFIG_USER_ONLY */
bool semihosting_enabled(void);
SemihostingTarget semihosting_get_target(void);
@ -68,6 +71,7 @@ Chardev *semihosting_get_chardev(void);
void qemu_semihosting_enable(void);
int qemu_semihosting_config_options(const char *opt);
void qemu_semihosting_connect_chardevs(void);
void qemu_semihosting_console_init(void);
#endif /* CONFIG_USER_ONLY */
#endif /* SEMIHOST_H */