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6719bdf3ed
Cr50 lacks native instructions for 64-bit integers and an ABI function can be used by the compiler to take the place of the needed instructions. This CL adds support for a right bitwise shift of 64-bit integers. BRANCH=none BUG=chromium:794010 TEST=Set CONFIG_LLSR_TEST, build, update cr50, and run llsrtest on the console. Change-Id: Iae66c86720c531454ba29f15b3cc6a07959f5ef2 Signed-off-by: Allen Webb <allenwebb@google.com> Reviewed-on: https://chromium-review.googlesource.com/931932 Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
/* Copyright 2018 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Enable the use of right shift for uint64_t. */
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#include <console.h>
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#include <compile_time_macros.h>
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#include <stdint.h>
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union words {
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uint64_t u64;
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uint32_t w[2];
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};
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uint64_t __aeabi_llsr(uint64_t v, uint32_t shift)
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{
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union words val;
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union words res;
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val.u64 = v;
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res.w[1] = val.w[1] >> shift;
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res.w[0] = val.w[0] >> shift;
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res.w[0] |= val.w[1] >> (shift - 32); /* Handle shift >= 32*/
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res.w[0] |= val.w[1] << (32 - shift); /* Handle shift <= 32*/
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return res.u64;
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}
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#ifdef CONFIG_LLSR_TEST
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static int command_llsr(int argc, char **argv)
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{
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/* Volatile to prevent compilier optimization from interfering. */
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volatile uint64_t start = 0x123456789ABCDEF0ull;
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uint32_t x;
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const struct {
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uint32_t shift_by;
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uint64_t result;
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} cases[] = {
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{0, start},
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{16, 0x123456789ABCull},
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{32, 0x12345678u},
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{48, 0x1234u},
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{64, 0u}
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};
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for (x = 0; x < ARRAY_SIZE(cases); ++x) {
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if ((start >> cases[x].shift_by) != cases[x].result) {
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ccprintf("FAILED %d\n", cases[x].shift_by);
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return EC_ERROR_UNKNOWN;
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}
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}
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ccprintf("SUCCESS\n");
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return EC_SUCCESS;
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}
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DECLARE_CONSOLE_COMMAND(
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llsrtest, command_llsr,
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"",
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"Run tests against the LLSR ABI. Prints SUCCESS or FAILURE.");
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#endif /* CONFIG_LLSR_TEST */
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