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ed32949e0a
In order for kernel to capture each denormalized output, the UDF trapping enable bit is always raised in $fpcsr. Because underflow case will issue not an underflow exception but also an inexact exception, it causes that the IEX, IEX cumulative exception, flag in $fpcsr to be raised in each denormalized output handling. To make the emulation transparent to the user, the emulator needs to clear the IEX flag in $fpcsr if the result is a denormalized number. However, if the IEX flag has been raised before this floating point emulation, this cleanup may be incorrect. To avoid the IEX flags in $fpcsr be raised in each denormalized output handling, the IEX trap shall be always enabled. Signed-off-by: Vincent Chen <vincentc@andestech.com> Acked-by: Greentime Hu <greentime@andestech.com> Signed-off-by: Greentime Hu <greentime@andestech.com>
85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#include <linux/syscalls.h>
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#include <linux/uaccess.h>
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#include <asm/cachectl.h>
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#include <asm/proc-fns.h>
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#include <asm/fpu.h>
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#include <asm/fp_udfiex_crtl.h>
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SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
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unsigned long, prot, unsigned long, flags,
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unsigned long, fd, unsigned long, pgoff)
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{
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if (pgoff & (~PAGE_MASK >> 12))
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return -EINVAL;
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return sys_mmap_pgoff(addr, len, prot, flags, fd,
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pgoff >> (PAGE_SHIFT - 12));
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}
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SYSCALL_DEFINE4(fadvise64_64_wrapper,int, fd, int, advice, loff_t, offset,
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loff_t, len)
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{
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return sys_fadvise64_64(fd, offset, len, advice);
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}
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SYSCALL_DEFINE3(cacheflush, unsigned int, start, unsigned int, end, int, cache)
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{
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struct vm_area_struct *vma;
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bool flushi = true, wbd = true;
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vma = find_vma(current->mm, start);
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if (!vma)
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return -EFAULT;
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switch (cache) {
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case ICACHE:
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wbd = false;
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break;
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case DCACHE:
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flushi = false;
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break;
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case BCACHE:
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break;
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default:
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return -EINVAL;
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}
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cpu_cache_wbinval_range_check(vma, start, end, flushi, wbd);
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return 0;
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}
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SYSCALL_DEFINE2(fp_udfiex_crtl, unsigned int, cmd, unsigned int, act)
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{
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#if IS_ENABLED(CONFIG_SUPPORT_DENORMAL_ARITHMETIC)
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int old_udf_iex;
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if (!used_math()) {
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load_fpu(&init_fpuregs);
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current->thread.fpu.UDF_IEX_trap = init_fpuregs.UDF_IEX_trap;
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set_used_math();
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}
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old_udf_iex = current->thread.fpu.UDF_IEX_trap;
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act &= (FPCSR_mskUDFE | FPCSR_mskIEXE);
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switch (cmd) {
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case DISABLE_UDF_IEX_TRAP:
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current->thread.fpu.UDF_IEX_trap &= ~act;
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break;
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case ENABLE_UDF_IEX_TRAP:
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current->thread.fpu.UDF_IEX_trap |= act;
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break;
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case GET_UDF_IEX_TRAP:
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break;
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default:
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return -EINVAL;
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}
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return old_udf_iex;
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#else
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return -ENOTSUPP;
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#endif
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}
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