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61 lines
1.5 KiB
61 lines
1.5 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* This testcase operates with the test_fpu kernel driver. |
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* It modifies the FPU control register in user mode and calls the kernel |
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* module to perform floating point operations in the kernel. The control |
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* register value should be independent between kernel and user mode. |
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*/ |
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#define _GNU_SOURCE |
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#include <stdio.h> |
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#include <errno.h> |
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#include <string.h> |
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#include <fenv.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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const char *test_fpu_path = "/sys/kernel/debug/selftest_helpers/test_fpu"; |
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int main(void) |
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{ |
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char dummy[1]; |
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int fd = open(test_fpu_path, O_RDONLY); |
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if (fd < 0) { |
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printf("[SKIP]\tcan't access %s: %s\n", |
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test_fpu_path, strerror(errno)); |
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return 0; |
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} |
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if (read(fd, dummy, 1) < 0) { |
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printf("[FAIL]\taccess with default rounding mode failed\n"); |
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return 1; |
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} |
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fesetround(FE_DOWNWARD); |
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if (read(fd, dummy, 1) < 0) { |
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printf("[FAIL]\taccess with downward rounding mode failed\n"); |
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return 2; |
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} |
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if (fegetround() != FE_DOWNWARD) { |
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printf("[FAIL]\tusermode rounding mode clobbered\n"); |
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return 3; |
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} |
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/* Note: the tests up to this point are quite safe and will only return |
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* an error. But the exception mask setting can cause misbehaving kernel |
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* to crash. |
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*/ |
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feclearexcept(FE_ALL_EXCEPT); |
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feenableexcept(FE_ALL_EXCEPT); |
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if (read(fd, dummy, 1) < 0) { |
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printf("[FAIL]\taccess with fpu exceptions unmasked failed\n"); |
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return 4; |
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} |
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if (fegetexcept() != FE_ALL_EXCEPT) { |
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printf("[FAIL]\tusermode fpu exception mask clobbered\n"); |
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return 5; |
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} |
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printf("[OK]\ttest_fpu\n"); |
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return 0; |
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}
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