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path: root/arch/loongarch/lib/clear_user.S
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2024-03-11LoongArch: Add ORC stack unwinder supportTiezhu Yang1-0/+3
The kernel CONFIG_UNWINDER_ORC option enables the ORC unwinder, which is similar in concept to a DWARF unwinder. The difference is that the format of the ORC data is much simpler than DWARF, which in turn allows the ORC unwinder to be much simpler and faster. The ORC data consists of unwind tables which are generated by objtool. After analyzing all the code paths of a .o file, it determines information about the stack state at each instruction address in the file and outputs that information to the .orc_unwind and .orc_unwind_ip sections. The per-object ORC sections are combined at link time and are sorted and post-processed at boot time. The unwinder uses the resulting data to correlate instruction addresses with their stack states at run time. Most of the logic are similar with x86, in order to get ra info before ra is saved into stack, add ra_reg and ra_offset into orc_entry. At the same time, modify some arch-specific code to silence the objtool warnings. Co-developed-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Jinyang He <hejinyang@loongson.cn> Co-developed-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2023-09-06LoongArch: Adjust {copy, clear}_user exception handler behaviorWeihao Li1-43/+44
The {copy, clear}_user function should returns number of bytes that could not be {copied, cleared}. So, try to {copy, clear} byte by byte when ld.{d,w,h} and st.{d,w,h} trapped into an exception. Reviewed-by: WANG Rui <wangrui@loongson.cn> Signed-off-by: Weihao Li <liweihao@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2023-08-25LoongArch: Replace #include <asm/export.h> with #include <linux/export.h>Masahiro Yamada1-1/+1
Commit ddb5cdbafaaad ("kbuild: generate KSYMTAB entries by modpost") deprecated <asm/export.h>, which is now a wrapper of <linux/export.h>. Replace #include <asm/export.h> with #include <linux/export.h>. After all the <asm/export.h> lines are converted, <asm/export.h> and <asm-generic/export.h> will be removed. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2023-07-28LoongArch: Fix return value underflow in exception pathWANG Rui1-1/+2
This patch fixes an underflow issue in the return value within the exception path, specifically at .Llt8 when the remaining length is less than 8 bytes. Cc: stable@vger.kernel.org Fixes: 8941e93ca590 ("LoongArch: Optimize memory ops (memset/memcpy/memmove)") Reported-by: Weihao Li <liweihao@loongson.cn> Signed-off-by: WANG Rui <wangrui@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2023-05-01LoongArch: Optimize memory ops (memset/memcpy/memmove)WANG Rui1-15/+121
To optimize memset()/memcpy()/memmove() and so on, we use a jump table to dispatch cases for short data lengths; and for long data lengths, we split the destination into head part (first 8 bytes), tail part (last 8 bytes) and middle part. The head part and tail part may be at unaligned addresses, while the middle part is always aligned (the middle part is allowed to overlap the head/tail part). In this way, the first and last 8 bytes may be unaligned accesses, but we can make sure the data in the middle is processed at an aligned destination address. We have tested micro-bench[1] on a Loongson-3C5000 16-core machine (2.2GHz): 1. memset | length | src offset | dst offset | speed before | speed after | % | |--------|------------|------------|--------------|-------------|---------| | 8 | 0 | 0 | 696.191 | 1518.785 | 118.16% | | 8 | 0 | 1 | 696.325 | 1518.937 | 118.14% | | 50 | 0 | 0 | 969.976 | 8053.902 | 730.32% | | 50 | 0 | 1 | 970.034 | 8058.475 | 730.74% | | 300 | 0 | 0 | 5876.612 | 16544.703 | 181.53% | | 300 | 0 | 1 | 5030.849 | 16549.011 | 228.95% | | 1200 | 0 | 0 | 11797.077 | 16752.137 | 42.00% | | 1200 | 0 | 1 | 5687.141 | 16645.233 | 192.68% | | 4000 | 0 | 0 | 15723.27 | 16761.557 | 6.60% | | 4000 | 0 | 1 | 5906.114 | 16732.316 | 183.30% | | 8000 | 0 | 0 | 16751.403 | 16770.002 | 0.11% | | 8000 | 0 | 1 | 5995.449 | 16754.07 | 179.45% | 2. memcpy | length | src offset | dst offset | speed before | speed after | % | |--------|------------|------------|--------------|-------------|---------| | 8 | 0 | 0 | 696.2 | 1670.605 | 139.96% | | 8 | 0 | 1 | 696.325 | 1671.138 | 139.99% | | 50 | 0 | 0 | 969.974 | 8724.999 | 799.51% | | 50 | 0 | 1 | 970.032 | 8730.138 | 799.98% | | 300 | 0 | 0 | 5564.662 | 16272.652 | 192.43% | | 300 | 0 | 1 | 4670.436 | 14972.842 | 220.59% | | 1200 | 0 | 0 | 10740.23 | 16751.728 | 55.97% | | 1200 | 0 | 1 | 5027.741 | 14874.564 | 195.85% | | 4000 | 0 | 0 | 15122.367 | 16737.642 | 10.68% | | 4000 | 0 | 1 | 5536.918 | 14890.397 | 168.93% | | 8000 | 0 | 0 | 16505.453 | 16553.543 | 0.29% | | 8000 | 0 | 1 | 5821.619 | 14841.804 | 154.94% | 3. memmove | length | src offset | dst offset | speed before | speed after | % | |--------|------------|------------|--------------|-------------|---------| | 8 | 0 | 0 | 982.693 | 1670.568 | 70.00% | | 8 | 0 | 1 | 983.023 | 1671.174 | 70.00% | | 50 | 0 | 0 | 1230.87 | 8727.625 | 609.06% | | 50 | 0 | 1 | 1232.515 | 8730.138 | 608.32% | | 300 | 0 | 0 | 6490.375 | 16296.993 | 151.09% | | 300 | 0 | 1 | 4282.687 | 14972.842 | 249.61% | | 1200 | 0 | 0 | 11742.755 | 16752.546 | 42.66% | | 1200 | 0 | 1 | 5039.338 | 14872.951 | 195.14% | | 4000 | 0 | 0 | 15467.786 | 16737.09 | 8.21% | | 4000 | 0 | 1 | 5009.905 | 14890.542 | 197.22% | | 8000 | 0 | 0 | 16489.664 | 16553.273 | 0.39% | | 8000 | 0 | 1 | 5823.786 | 14858.646 | 155.14% | * speed: MB/s * length: byte [1] https://github.com/heiher/mem-bench Signed-off-by: WANG Rui <wangrui@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-12-14LoongArch: Use alternative to optimize librariesHuacai Chen1-5/+65
Use the alternative to optimize common libraries according whether CPU has UAL (hardware unaligned access support) feature, including memset(), memcopy(), memmove(), copy_user() and clear_user(). We have tested UnixBench on a Loongson-3A5000 quad-core machine (1.6GHz): 1, One copy, before patch: System Benchmarks Index Values BASELINE RESULT INDEX Dhrystone 2 using register variables 116700.0 9566582.0 819.8 Double-Precision Whetstone 55.0 2805.3 510.1 Execl Throughput 43.0 2120.0 493.0 File Copy 1024 bufsize 2000 maxblocks 3960.0 209833.0 529.9 File Copy 256 bufsize 500 maxblocks 1655.0 89400.0 540.2 File Copy 4096 bufsize 8000 maxblocks 5800.0 320036.0 551.8 Pipe Throughput 12440.0 340624.0 273.8 Pipe-based Context Switching 4000.0 109939.1 274.8 Process Creation 126.0 4728.7 375.3 Shell Scripts (1 concurrent) 42.4 2223.1 524.3 Shell Scripts (8 concurrent) 6.0 883.1 1471.9 System Call Overhead 15000.0 518639.1 345.8 ======== System Benchmarks Index Score 500.2 2, One copy, after patch: System Benchmarks Index Values BASELINE RESULT INDEX Dhrystone 2 using register variables 116700.0 9567674.7 819.9 Double-Precision Whetstone 55.0 2805.5 510.1 Execl Throughput 43.0 2392.7 556.4 File Copy 1024 bufsize 2000 maxblocks 3960.0 417804.0 1055.1 File Copy 256 bufsize 500 maxblocks 1655.0 112909.5 682.2 File Copy 4096 bufsize 8000 maxblocks 5800.0 1255207.4 2164.2 Pipe Throughput 12440.0 555712.0 446.7 Pipe-based Context Switching 4000.0 99964.5 249.9 Process Creation 126.0 5192.5 412.1 Shell Scripts (1 concurrent) 42.4 2302.4 543.0 Shell Scripts (8 concurrent) 6.0 919.6 1532.6 System Call Overhead 15000.0 511159.3 340.8 ======== System Benchmarks Index Score 640.1 3, Four copies, before patch: System Benchmarks Index Values BASELINE RESULT INDEX Dhrystone 2 using register variables 116700.0 38268610.5 3279.2 Double-Precision Whetstone 55.0 11222.2 2040.4 Execl Throughput 43.0 7892.0 1835.3 File Copy 1024 bufsize 2000 maxblocks 3960.0 235149.6 593.8 File Copy 256 bufsize 500 maxblocks 1655.0 74959.6 452.9 File Copy 4096 bufsize 8000 maxblocks 5800.0 545048.5 939.7 Pipe Throughput 12440.0 1337359.0 1075.0 Pipe-based Context Switching 4000.0 473663.9 1184.2 Process Creation 126.0 17491.2 1388.2 Shell Scripts (1 concurrent) 42.4 6865.7 1619.3 Shell Scripts (8 concurrent) 6.0 1015.9 1693.1 System Call Overhead 15000.0 1899535.2 1266.4 ======== System Benchmarks Index Score 1278.3 4, Four copies, after patch: System Benchmarks Index Values BASELINE RESULT INDEX Dhrystone 2 using register variables 116700.0 38272815.5 3279.6 Double-Precision Whetstone 55.0 11222.8 2040.5 Execl Throughput 43.0 8839.2 2055.6 File Copy 1024 bufsize 2000 maxblocks 3960.0 313912.9 792.7 File Copy 256 bufsize 500 maxblocks 1655.0 80976.1 489.3 File Copy 4096 bufsize 8000 maxblocks 5800.0 1176594.3 2028.6 Pipe Throughput 12440.0 2100941.9 1688.9 Pipe-based Context Switching 4000.0 476696.4 1191.7 Process Creation 126.0 18394.7 1459.9 Shell Scripts (1 concurrent) 42.4 7172.2 1691.6 Shell Scripts (8 concurrent) 6.0 1058.3 1763.9 System Call Overhead 15000.0 1874714.7 1249.8 ======== System Benchmarks Index Score 1488.8 Signed-off-by: Jun Yi <yijun@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-12-14LoongArch: Remove the .fixup section usageYouling Tang1-9/+5
Use the `.L_xxx` label to improve fixup code and then remove the .fixup section usage. Signed-off-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-12-14LoongArch: Consolidate __ex_table constructionYouling Tang1-3/+2
Consolidate all the __ex_table constuction code with a _ASM_EXTABLE or _asm_extable helper. There should be no functional change as a result of this patch. Signed-off-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-07-29LoongArch: Simplify "BGT foo, zero" with BGTZWANG Xuerui1-1/+1
Support for the syntactic sugar is present in upstream binutils port from the beginning. Use it for shorter lines and better consistency. Generated code should be identical. Signed-off-by: WANG Xuerui <git@xen0n.name> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
2022-06-03LoongArch: Add some library functionsHuacai Chen1-0/+43
Add some library functions for LoongArch, including: delay, memset, memcpy, memmove, copy_user, strncpy_user, strnlen_user and tlb dump functions. Reviewed-by: WANG Xuerui <git@xen0n.name> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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