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target-arm: default empty semihosting cmdline

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If neither explicit semihosting args nor -kernel are used,
make SYS_GET_CMDLINE return an empty string.

Signed-off-by: Liviu Ionescu <ilg@livius.net>
Message-id: AC7B5AFC-06AE-4FAD-9852-B65708E80E09@livius.net
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Liviu Ionescu 2015-06-26 14:22:36 +01:00 committed by Peter Maydell
parent ca79373653
commit f3c2bda216
1 changed files with 9 additions and 2 deletions
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11
target-arm/arm-semi.c
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@ -436,12 +436,19 @@ uint32_t do_arm_semihosting(CPUARMState *env)
size_t input_size;
size_t output_size;
int status = 0;
#if !defined(CONFIG_USER_ONLY)
const char *cmdline;
#endif
GET_ARG(0);
GET_ARG(1);
input_size = arg1;
/* Compute the size of the output string. */
#if !defined(CONFIG_USER_ONLY)
output_size = strlen(semihosting_get_cmdline()) + 1;
cmdline = semihosting_get_cmdline();
if (cmdline == NULL) {
cmdline = ""; /* Default to an empty line. */
}
output_size = strlen(cmdline) + 1; /* Count terminating 0. */
#else
unsigned int i;
@ -472,7 +479,7 @@ uint32_t do_arm_semihosting(CPUARMState *env)
/* Copy the command-line arguments. */
#if !defined(CONFIG_USER_ONLY)
pstrcpy(output_buffer, output_size, semihosting_get_cmdline());
pstrcpy(output_buffer, output_size, cmdline);
#else
if (output_size == 1) {
/* Empty command-line. */