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tests/tcg: add simple commpage test case

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The COMMPAGE are a number of kernel provided user-space routines for
32 bit ARM systems. Add a basic series of smoke tests to ensure it is
working as it should.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200605154929.26910-14-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2020-06-05 16:49:28 +01:00
parent 5c3e87f345
commit b6771210b5
2 changed files with 63 additions and 0 deletions
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2
tests/tcg/arm/Makefile.target
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@ -68,6 +68,8 @@ run-semiconsole-arm: semiconsole-arm
run-plugin-semiconsole-arm-with-%:
$(call skip-test, $<, "MANUAL ONLY")
ARM_TESTS += commpage
TESTS += $(ARM_TESTS)
# On ARM Linux only supports 4k pages

61
tests/tcg/arm/commpage.c Normal file
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@ -0,0 +1,61 @@
/*
* Verify the COMMPAGE emulation
*
* The ARM commpage is a set of user space helper functions provided
* by the kernel in an effort to ease portability of user space code
* between different CPUs with potentially different capabilities. It
* is a 32 bit invention and similar to the vdso segment in many ways.
*
* The ABI is documented in the Linux kernel:
* Documentation/arm/kernel_userspace_helpers.rst
*
* Copyright (c) 2020 Linaro Ltd
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#define ARM_COMMPAGE (0xffff0f00u)
#define ARM_KUSER_VERSION (*(int32_t *)(ARM_COMMPAGE + 0xfc))
typedef void * (get_tls_fn)(void);
#define ARM_KUSER_GET_TLS (*(get_tls_fn *)(ARM_COMMPAGE + 0xe0))
typedef int (cmpxchg_fn)(int oldval, int newval, volatile int *ptr);
#define ARM_KUSER_CMPXCHG (*(cmpxchg_fn *)(ARM_COMMPAGE + 0xc0))
typedef void (dmb_fn)(void);
#define ARM_KUSER_DMB (*(dmb_fn *)(ARM_COMMPAGE + 0xa0))
typedef int (cmpxchg64_fn)(const int64_t *oldval,
const int64_t *newval,
volatile int64_t *ptr);
#define ARM_KUSER_CMPXCHG64 (*(cmpxchg64_fn *)(ARM_COMMPAGE + 0x60))
#define fail_unless(x) \
do { \
if (!(x)) { \
fprintf(stderr, "FAILED at %s:%d\n", __FILE__, __LINE__); \
exit(EXIT_FAILURE); \
} \
} while (0)
int main(int argc, char *argv[argc])
{
void *kuser_tls;
int val = 1;
const int64_t oldval = 1, newval = 2;
int64_t val64 = 1;
fail_unless(ARM_KUSER_VERSION == 0x5);
kuser_tls = ARM_KUSER_GET_TLS();
printf("TLS = %p\n", kuser_tls);
fail_unless(kuser_tls != 0);
fail_unless(ARM_KUSER_CMPXCHG(1, 2, &val) == 0);
printf("val = %d\n", val);
/* this is a crash test, not checking an actual barrier occurs */
ARM_KUSER_DMB();
fail_unless(ARM_KUSER_CMPXCHG64(&oldval, &newval, &val64) == 0);
printf("val64 = %lld\n", val64);
return 0;
}