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semihosting: Implement SYS_ELAPSED and SYS_TICKFREQ

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These are part of Semihosting for AArch32 and AArch64 Release 2.0

Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20210107170717.2098982-8-keithp@keithp.com>
Message-Id: <20210108224256.2321-19-alex.bennee@linaro.org>
This commit is contained in:
Keith Packard 2021-01-08 22:42:54 +00:00 committed by Alex Bennée
parent 6b80cb25b4
commit 4d834039c2
3 changed files with 22 additions and 0 deletions
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16
hw/semihosting/arm-compat-semi.c
View File

@ -38,6 +38,7 @@
#include "hw/semihosting/console.h"
#include "hw/semihosting/common-semi.h"
#include "qemu/log.h"
#include "qemu/timer.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
@ -73,6 +74,8 @@
#define TARGET_SYS_EXIT 0x18
#define TARGET_SYS_SYNCCACHE 0x19
#define TARGET_SYS_EXIT_EXTENDED 0x20
#define TARGET_SYS_ELAPSED 0x30
#define TARGET_SYS_TICKFREQ 0x31
/* ADP_Stopped_ApplicationExit is used for exit(0),
* anything else is implemented as exit(1) */
@ -837,6 +840,7 @@ target_ulong do_common_semihosting(CPUState *cs)
uint32_t ret;
uint32_t len;
GuestFD *gf;
int64_t elapsed;
(void) env; /* Used implicitly by arm lock_user macro */
nr = common_semi_arg(cs, 0) & 0xffffffffU;
@ -1246,6 +1250,18 @@ target_ulong do_common_semihosting(CPUState *cs)
}
gdb_exit(ret);
exit(ret);
case TARGET_SYS_ELAPSED:
elapsed = get_clock() - clock_start;
if (sizeof(target_ulong) == 8) {
SET_ARG(0, elapsed);
} else {
SET_ARG(0, (uint32_t) elapsed);
SET_ARG(1, (uint32_t) (elapsed >> 32));
}
return 0;
case TARGET_SYS_TICKFREQ:
/* qemu always uses nsec */
return 1000000000;
case TARGET_SYS_SYNCCACHE:
/*
* Clean the D-cache and invalidate the I-cache for the specified

2
include/qemu/timer.h
View File

@ -808,6 +808,8 @@ static inline int64_t get_clock_realtime(void)
return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);
}
extern int64_t clock_start;
/* Warning: don't insert tracepoints into these functions, they are
also used by simpletrace backend and tracepoints would cause
an infinite recursion! */

4
util/qemu-timer-common.c
View File

@ -27,6 +27,8 @@
/***********************************************************/
/* real time host monotonic timer */
int64_t clock_start;
#ifdef _WIN32
int64_t clock_freq;
@ -41,6 +43,7 @@ static void __attribute__((constructor)) init_get_clock(void)
exit(1);
}
clock_freq = freq.QuadPart;
clock_start = get_clock();
}
#else
@ -55,5 +58,6 @@ static void __attribute__((constructor)) init_get_clock(void)
if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
use_rt_clock = 1;
}
clock_start = get_clock();
}
#endif