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/*
* Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <stdlib.h>
#include <stdint.h>
#include <unit/io.h>
#include <unit/unit.h>
#include <nvgpu/types.h>
/*
* Test if the passed type is signed. In the signed case this expression becomes
*
* x = 0;
* y = x - 1 = -1
*
* And -1 < 0 will be true. In the unsigned case, we rely on wrap around. We
* have the following
*
* x = 0U
* y = x - 1 = ~0 (i.e <TYPE>_MAX)
*
* Thus the expression y < x is false.
*/
#define IS_SIGNED_TYPE(__type__) \
({ \
__type__ x = (__type__)0; \
__type__ y = x - (__type__)1; \
y < x; \
})
/*
* Ensure that our sized types are of the correct size. Assumes an 8bit byte of
* course.
*/
static int sanity_test_sizes(struct unit_module *m,
struct gk20a *g, void *args)
{
size_t size_u8 = sizeof(u8);
size_t size_u16 = sizeof(u16);
size_t size_u32 = sizeof(u32);
size_t size_u64 = sizeof(u64);
size_t size_s8 = sizeof(s8);
size_t size_s16 = sizeof(s16);
size_t size_s32 = sizeof(s32);
size_t size_s64 = sizeof(s64);
/* Unsigned. */
if (size_u8 != 1U)
unit_return_fail(m,
"sizeof(u8) != 1 byte! (Actual size: %zu)\n",
size_u8);
if (size_u16 != 2U)
unit_return_fail(m,
"sizeof(u16) != 2 bytes! (Actual size: %zu)\n",
size_u16);
if (size_u32 != 4U)
unit_return_fail(m,
"sizeof(u32) != 4 bytes! (Actual size: %zu)\n",
size_u32);
if (size_u64 != 8U)
unit_return_fail(m,
"sizeof(u64) != 8 bytes! (Actual size: %zu)\n",
size_u64);
/* Signed. */
if (size_s8 != 1U)
unit_return_fail(m,
"sizeof(s8) != 1 byte! (Actual size: %zu)\n",
size_s8);
if (size_s16 != 2U)
unit_return_fail(m,
"sizeof(s16) != 2 bytes! (Actual size: %zu)\n",
size_s16);
if (size_s32 != 4U)
unit_return_fail(m,
"sizeof(s32) != 4 bytes! (Actual size: %zu)\n",
size_s32);
if (size_s64 != 8U)
unit_return_fail(m,
"sizeof(s64) != 8 bytes! (Actual size: %zu)\n",
size_s64);
return UNIT_SUCCESS;
}
/*
* Make sure that the signed types really are signed and that the unsigned types
* really are not.
*/
static int sanity_test_signage(struct unit_module *m,
struct gk20a *g, void *args)
{
if (!IS_SIGNED_TYPE(s8))
unit_return_fail(m, "s8 is not signed!\n");
if (!IS_SIGNED_TYPE(s16))
unit_return_fail(m, "s16 is not signed!\n");
if (!IS_SIGNED_TYPE(s32))
unit_return_fail(m, "s32 is not signed!\n");
if (!IS_SIGNED_TYPE(s64))
unit_return_fail(m, "s64 is not signed!\n");
if (IS_SIGNED_TYPE(u8))
unit_return_fail(m, "u8 is signed!\n");
if (IS_SIGNED_TYPE(u16))
unit_return_fail(m, "u16 is signed!\n");
if (IS_SIGNED_TYPE(u32))
unit_return_fail(m, "u32 is signed!\n");
if (IS_SIGNED_TYPE(u64))
unit_return_fail(m, "u64 is signed!\n");
return UNIT_SUCCESS;
}
/*
* Ensure that a u64 can hold a pointer since in some places we use a u64 to
* pass back a pointer value.
*/
static int sanity_test_ptr_in_u64(struct unit_module *m,
struct gk20a *g, void *args)
{
if (sizeof(u64) < sizeof(uintptr_t))
unit_return_fail(m,
"u64 size (%zu b) less than pointer size (%zu b)",
sizeof(u64), sizeof(uintptr_t));
return UNIT_SUCCESS;
}
static int sanity_test_endianness(struct unit_module *m,
struct gk20a *g, void *args)
{
u32 i;
u32 x = 0x12345678;
u8 *ptr_x_u8 = (u8 *)&x;
u16 *ptr_x_u16 = (u16 *)&x;
/*
* Print what endianness we have. For now we have not explicitly decided
* to support one or the other, but this will have to be determined
* eventually.
*
* We have just been lucky so far.
*/
unit_info(m, "u32 x = 0x%x\n", x);
for (i = 0; i < sizeof(u32) / sizeof(u16); i++) {
unit_info(m, " &x + %zu: 0x%04hx\n",
i * sizeof(u16), ptr_x_u16[i]);
}
unit_info(m, "u32 x = 0x%x\n", x);
for (i = 0; i < sizeof(u32); i++) {
unit_info(m, " &x + %u: 0x%02hhx\n", i, ptr_x_u8[i]);
}
switch (ptr_x_u8[0]) {
case 0x12:
unit_info(m, "Machine endianness: big\n");
break;
case 0x78:
unit_info(m, "Machine endianness: little\n");
break;
default:
unit_return_fail(m, "Machine endianness: middle/unknown ??\n");
}
return UNIT_SUCCESS;
}
struct unit_module_test posix_env_tests[] = {
UNIT_TEST(sizes, sanity_test_sizes, NULL),
UNIT_TEST(signage, sanity_test_signage, NULL),
UNIT_TEST(endianness, sanity_test_endianness, NULL),
UNIT_TEST(ptr_in_u64, sanity_test_ptr_in_u64, NULL),
};
UNIT_MODULE(posix_env, posix_env_tests, UNIT_PRIO_POSIX_TEST);
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