From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Fix error output of boot instance creation failure Currently if a boot instance creation fails, instead of printing out the name of the instance that failed, it prints "(null)". That is because it prints "cur_str" that had already been processed by strsep(). Print the saved name instead. While at it, print the error code of the failure. - Fix use-after-free for same named historgrams Histograms can be named so that they can be used in multiple events. But if the named histogram has a variable attached, the second event that uses the named histogram which duplicates it and needs to free the original after duplication leaves the old variable in place and still visible. If another histogram uses than variable, it will use the stale one which will try to reference the freed duplicate histogram and crash the kernel. Free the duplicate variables along with the duplicated histogram data. - Check return value of kthread_run() in event self test The events self tests uses a kthread for testing but does not check if it succeeded in creating a kthread. If the kthread creation were to fail, the code will still try to call kthread_stop() on the error returned. - Fix race between reading trace_pipe and updating subbuffer size If a user is reading the trace_pipe file at the same time they update the ring buffer sub-buffer size, can cause the trace_pipe read to read stale data. Add trace_access_lock() around updating the ring buffer sub-buffer size. - Fix eventfs_inode on failure path in creation of the events directory In the creation of the "events" directory, if after allocating the eventfs_inode a failure is detected, it calls cleanup_ei() which calls free_ei(). The free_ei() will test if eventfs_inode being freed has no children. It is a bug if it does. But on the failure case of the creation of the "events" directory, the children lists have not yet been initialized and the free will trigger a warning because list_empty() on an uninitialized list returns false. Move the initialization into init_ei() where it makes more sense and makes sure that a created eventfs_inode has its lists initialized upon creation. - Check return value of kthread_run() in ftrace direct sample code The sample code that shows how to use the ftrace direct calls does not test the return of kthread_run() to see if it succeeds. Return a failure if the kthread_run() doesn't succeed. - Clear user events state on fork in case of alloc failure On fork, the child gets a pointer to the parent's user events state. It makes a copy of it then updates the child's pointer to it. But if the allocation fails, the duplication function leaves the child with a pointer to its parent's descriptor. When the child cleans up its data, it will free the parent's descriptor while the parent is still using it. In the duplication function, set the child's user_event_mm to NULL before testing if the allocation succeeded, and when it exits it will not free the parent's descriptor. - Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. But the check for success expects the retry value to be non-zero and exits with an error on zero. This is the opposite result. Fix it. - Fail nicely when the remote swap_reader_page() returns an error Currently, if the swap_reader_page() of a remote buffer fails, it triggers a WARN_ON_ONCE() and continues normally. Instead, have it exit with an error and a pr_warn() print instead of a full WARNING. * tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Stop remote reader update when page swap fails tracing: Fix retry exhaustion in simple ring buffer reader swap tracing/user_events: Clear copied tracing state before fork duplication samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify eventfs: Initialize ei->children and ei->list in init_ei() tracing: Fix use-after-free in trace_pipe read on sub-buffer order change tracing: Fix crash passing ERR_PTR to kthread_stop() tracing: Fix use-after-free with same-name named triggers tracing: Fix logged instance name on creation failure --- arch/xtensa/lib/memcopy.S | 542 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 542 insertions(+) create mode 100644 arch/xtensa/lib/memcopy.S (limited to 'arch/xtensa/lib/memcopy.S') diff --git a/arch/xtensa/lib/memcopy.S b/arch/xtensa/lib/memcopy.S new file mode 100644 index 000000000..f60760396 --- /dev/null +++ b/arch/xtensa/lib/memcopy.S @@ -0,0 +1,542 @@ +/* + * arch/xtensa/lib/hal/memcopy.S -- Core HAL library functions + * xthal_memcpy and xthal_bcopy + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2002 - 2012 Tensilica Inc. + */ + +#include +#include +#include + +/* + * void *memcpy(void *dst, const void *src, size_t len); + * + * This function is intended to do the same thing as the standard + * library function memcpy() for most cases. + * However, where the source and/or destination references + * an instruction RAM or ROM or a data RAM or ROM, that + * source and/or destination will always be accessed with + * 32-bit load and store instructions (as required for these + * types of devices). + * + * !!!!!!! XTFIXME: + * !!!!!!! Handling of IRAM/IROM has not yet + * !!!!!!! been implemented. + * + * The (general case) algorithm is as follows: + * If destination is unaligned, align it by conditionally + * copying 1 and 2 bytes. + * If source is aligned, + * do 16 bytes with a loop, and then finish up with + * 8, 4, 2, and 1 byte copies conditional on the length; + * else (if source is unaligned), + * do the same, but use SRC to align the source data. + * This code tries to use fall-through branches for the common + * case of aligned source and destination and multiple + * of 4 (or 8) length. + * + * Register use: + * a0/ return address + * a1/ stack pointer + * a2/ return value + * a3/ src + * a4/ length + * a5/ dst + * a6/ tmp + * a7/ tmp + * a8/ tmp + * a9/ tmp + * a10/ tmp + * a11/ tmp + */ + + .text + +/* + * Byte by byte copy + */ + .align 4 + .byte 0 # 1 mod 4 alignment for LOOPNEZ + # (0 mod 4 alignment for LBEG) +.Lbytecopy: +#if XCHAL_HAVE_LOOPS + loopnez a4, .Lbytecopydone +#else /* !XCHAL_HAVE_LOOPS */ + beqz a4, .Lbytecopydone + add a7, a3, a4 # a7 = end address for source +#endif /* !XCHAL_HAVE_LOOPS */ +.Lnextbyte: + l8ui a6, a3, 0 + addi a3, a3, 1 + s8i a6, a5, 0 + addi a5, a5, 1 +#if !XCHAL_HAVE_LOOPS + bne a3, a7, .Lnextbyte # continue loop if $a3:src != $a7:src_end +#endif /* !XCHAL_HAVE_LOOPS */ +.Lbytecopydone: + abi_ret_default + +/* + * Destination is unaligned + */ + + .align 4 +.Ldst1mod2: # dst is only byte aligned + _bltui a4, 7, .Lbytecopy # do short copies byte by byte + + # copy 1 byte + l8ui a6, a3, 0 + addi a3, a3, 1 + addi a4, a4, -1 + s8i a6, a5, 0 + addi a5, a5, 1 + _bbci.l a5, 1, .Ldstaligned # if dst is now aligned, then + # return to main algorithm +.Ldst2mod4: # dst 16-bit aligned + # copy 2 bytes + _bltui a4, 6, .Lbytecopy # do short copies byte by byte + l8ui a6, a3, 0 + l8ui a7, a3, 1 + addi a3, a3, 2 + addi a4, a4, -2 + s8i a6, a5, 0 + s8i a7, a5, 1 + addi a5, a5, 2 + j .Ldstaligned # dst is now aligned, return to main algorithm + +ENTRY(__memcpy) +WEAK(memcpy) + + abi_entry_default + # a2/ dst, a3/ src, a4/ len + mov a5, a2 # copy dst so that a2 is return value +.Lcommon: + _bbsi.l a2, 0, .Ldst1mod2 # if dst is 1 mod 2 + _bbsi.l a2, 1, .Ldst2mod4 # if dst is 2 mod 4 +.Ldstaligned: # return here from .Ldst?mod? once dst is aligned + srli a7, a4, 4 # number of loop iterations with 16B + # per iteration + movi a8, 3 # if source is not aligned, + _bany a3, a8, .Lsrcunaligned # then use shifting copy + /* + * Destination and source are word-aligned, use word copy. + */ + # copy 16 bytes per iteration for word-aligned dst and word-aligned src +#if XCHAL_HAVE_LOOPS + loopnez a7, .Loop1done +#else /* !XCHAL_HAVE_LOOPS */ + beqz a7, .Loop1done + slli a8, a7, 4 + add a8, a8, a3 # a8 = end of last 16B source chunk +#endif /* !XCHAL_HAVE_LOOPS */ +.Loop1: + l32i a6, a3, 0 + l32i a7, a3, 4 + s32i a6, a5, 0 + l32i a6, a3, 8 + s32i a7, a5, 4 + l32i a7, a3, 12 + s32i a6, a5, 8 + addi a3, a3, 16 + s32i a7, a5, 12 + addi a5, a5, 16 +#if !XCHAL_HAVE_LOOPS + bne a3, a8, .Loop1 # continue loop if a3:src != a8:src_end +#endif /* !XCHAL_HAVE_LOOPS */ +.Loop1done: + bbci.l a4, 3, .L2 + # copy 8 bytes + l32i a6, a3, 0 + l32i a7, a3, 4 + addi a3, a3, 8 + s32i a6, a5, 0 + s32i a7, a5, 4 + addi a5, a5, 8 +.L2: + bbsi.l a4, 2, .L3 + bbsi.l a4, 1, .L4 + bbsi.l a4, 0, .L5 + abi_ret_default +.L3: + # copy 4 bytes + l32i a6, a3, 0 + addi a3, a3, 4 + s32i a6, a5, 0 + addi a5, a5, 4 + bbsi.l a4, 1, .L4 + bbsi.l a4, 0, .L5 + abi_ret_default +.L4: + # copy 2 bytes + l16ui a6, a3, 0 + addi a3, a3, 2 + s16i a6, a5, 0 + addi a5, a5, 2 + bbsi.l a4, 0, .L5 + abi_ret_default +.L5: + # copy 1 byte + l8ui a6, a3, 0 + s8i a6, a5, 0 + abi_ret_default + +/* + * Destination is aligned, Source is unaligned + */ + + .align 4 +.Lsrcunaligned: + _beqz a4, .Ldone # avoid loading anything for zero-length copies + # copy 16 bytes per iteration for word-aligned dst and unaligned src + __ssa8 a3 # set shift amount from byte offset + +/* set to 1 when running on ISS (simulator) with the + lint or ferret client, or 0 to save a few cycles */ +#define SIM_CHECKS_ALIGNMENT 1 +#if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT + and a11, a3, a8 # save unalignment offset for below + sub a3, a3, a11 # align a3 +#endif + l32i a6, a3, 0 # load first word +#if XCHAL_HAVE_LOOPS + loopnez a7, .Loop2done +#else /* !XCHAL_HAVE_LOOPS */ + beqz a7, .Loop2done + slli a10, a7, 4 + add a10, a10, a3 # a10 = end of last 16B source chunk +#endif /* !XCHAL_HAVE_LOOPS */ +.Loop2: + l32i a7, a3, 4 + l32i a8, a3, 8 + __src_b a6, a6, a7 + s32i a6, a5, 0 + l32i a9, a3, 12 + __src_b a7, a7, a8 + s32i a7, a5, 4 + l32i a6, a3, 16 + __src_b a8, a8, a9 + s32i a8, a5, 8 + addi a3, a3, 16 + __src_b a9, a9, a6 + s32i a9, a5, 12 + addi a5, a5, 16 +#if !XCHAL_HAVE_LOOPS + bne a3, a10, .Loop2 # continue loop if a3:src != a10:src_end +#endif /* !XCHAL_HAVE_LOOPS */ +.Loop2done: + bbci.l a4, 3, .L12 + # copy 8 bytes + l32i a7, a3, 4 + l32i a8, a3, 8 + __src_b a6, a6, a7 + s32i a6, a5, 0 + addi a3, a3, 8 + __src_b a7, a7, a8 + s32i a7, a5, 4 + addi a5, a5, 8 + mov a6, a8 +.L12: + bbci.l a4, 2, .L13 + # copy 4 bytes + l32i a7, a3, 4 + addi a3, a3, 4 + __src_b a6, a6, a7 + s32i a6, a5, 0 + addi a5, a5, 4 + mov a6, a7 +.L13: +#if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT + add a3, a3, a11 # readjust a3 with correct misalignment +#endif + bbsi.l a4, 1, .L14 + bbsi.l a4, 0, .L15 +.Ldone: abi_ret_default +.L14: + # copy 2 bytes + l8ui a6, a3, 0 + l8ui a7, a3, 1 + addi a3, a3, 2 + s8i a6, a5, 0 + s8i a7, a5, 1 + addi a5, a5, 2 + bbsi.l a4, 0, .L15 + abi_ret_default +.L15: + # copy 1 byte + l8ui a6, a3, 0 + s8i a6, a5, 0 + abi_ret_default + +ENDPROC(__memcpy) +EXPORT_SYMBOL(__memcpy) +EXPORT_SYMBOL(memcpy) + +/* + * void *memmove(void *dst, const void *src, size_t len); + * + * This function is intended to do the same thing as the standard + * library function memmove() for most cases. + * However, where the source and/or destination references + * an instruction RAM or ROM or a data RAM or ROM, that + * source and/or destination will always be accessed with + * 32-bit load and store instructions (as required for these + * types of devices). + * + * !!!!!!! XTFIXME: + * !!!!!!! Handling of IRAM/IROM has not yet + * !!!!!!! been implemented. + * + * The (general case) algorithm is as follows: + * If end of source doesn't overlap destination then use memcpy. + * Otherwise do memcpy backwards. + * + * Register use: + * a0/ return address + * a1/ stack pointer + * a2/ return value + * a3/ src + * a4/ length + * a5/ dst + * a6/ tmp + * a7/ tmp + * a8/ tmp + * a9/ tmp + * a10/ tmp + * a11/ tmp + */ + +/* + * Byte by byte copy + */ + .align 4 + .byte 0 # 1 mod 4 alignment for LOOPNEZ + # (0 mod 4 alignment for LBEG) +.Lbackbytecopy: +#if XCHAL_HAVE_LOOPS + loopnez a4, .Lbackbytecopydone +#else /* !XCHAL_HAVE_LOOPS */ + beqz a4, .Lbackbytecopydone + sub a7, a3, a4 # a7 = start address for source +#endif /* !XCHAL_HAVE_LOOPS */ +.Lbacknextbyte: + addi a3, a3, -1 + l8ui a6, a3, 0 + addi a5, a5, -1 + s8i a6, a5, 0 +#if !XCHAL_HAVE_LOOPS + bne a3, a7, .Lbacknextbyte # continue loop if + # $a3:src != $a7:src_start +#endif /* !XCHAL_HAVE_LOOPS */ +.Lbackbytecopydone: + abi_ret_default + +/* + * Destination is unaligned + */ + + .align 4 +.Lbackdst1mod2: # dst is only byte aligned + _bltui a4, 7, .Lbackbytecopy # do short copies byte by byte + + # copy 1 byte + addi a3, a3, -1 + l8ui a6, a3, 0 + addi a5, a5, -1 + s8i a6, a5, 0 + addi a4, a4, -1 + _bbci.l a5, 1, .Lbackdstaligned # if dst is now aligned, then + # return to main algorithm +.Lbackdst2mod4: # dst 16-bit aligned + # copy 2 bytes + _bltui a4, 6, .Lbackbytecopy # do short copies byte by byte + addi a3, a3, -2 + l8ui a6, a3, 0 + l8ui a7, a3, 1 + addi a5, a5, -2 + s8i a6, a5, 0 + s8i a7, a5, 1 + addi a4, a4, -2 + j .Lbackdstaligned # dst is now aligned, + # return to main algorithm + +ENTRY(__memmove) +WEAK(memmove) + + abi_entry_default + # a2/ dst, a3/ src, a4/ len + mov a5, a2 # copy dst so that a2 is return value +.Lmovecommon: + sub a6, a5, a3 + bgeu a6, a4, .Lcommon + + add a5, a5, a4 + add a3, a3, a4 + + _bbsi.l a5, 0, .Lbackdst1mod2 # if dst is 1 mod 2 + _bbsi.l a5, 1, .Lbackdst2mod4 # if dst is 2 mod 4 +.Lbackdstaligned: # return here from .Lbackdst?mod? once dst is aligned + srli a7, a4, 4 # number of loop iterations with 16B + # per iteration + movi a8, 3 # if source is not aligned, + _bany a3, a8, .Lbacksrcunaligned # then use shifting copy + /* + * Destination and source are word-aligned, use word copy. + */ + # copy 16 bytes per iteration for word-aligned dst and word-aligned src +#if XCHAL_HAVE_LOOPS + loopnez a7, .LbackLoop1done +#else /* !XCHAL_HAVE_LOOPS */ + beqz a7, .LbackLoop1done + slli a8, a7, 4 + sub a8, a3, a8 # a8 = start of first 16B source chunk +#endif /* !XCHAL_HAVE_LOOPS */ +.LbackLoop1: + addi a3, a3, -16 + l32i a7, a3, 12 + l32i a6, a3, 8 + addi a5, a5, -16 + s32i a7, a5, 12 + l32i a7, a3, 4 + s32i a6, a5, 8 + l32i a6, a3, 0 + s32i a7, a5, 4 + s32i a6, a5, 0 +#if !XCHAL_HAVE_LOOPS + bne a3, a8, .LbackLoop1 # continue loop if a3:src != a8:src_start +#endif /* !XCHAL_HAVE_LOOPS */ +.LbackLoop1done: + bbci.l a4, 3, .Lback2 + # copy 8 bytes + addi a3, a3, -8 + l32i a6, a3, 0 + l32i a7, a3, 4 + addi a5, a5, -8 + s32i a6, a5, 0 + s32i a7, a5, 4 +.Lback2: + bbsi.l a4, 2, .Lback3 + bbsi.l a4, 1, .Lback4 + bbsi.l a4, 0, .Lback5 + abi_ret_default +.Lback3: + # copy 4 bytes + addi a3, a3, -4 + l32i a6, a3, 0 + addi a5, a5, -4 + s32i a6, a5, 0 + bbsi.l a4, 1, .Lback4 + bbsi.l a4, 0, .Lback5 + abi_ret_default +.Lback4: + # copy 2 bytes + addi a3, a3, -2 + l16ui a6, a3, 0 + addi a5, a5, -2 + s16i a6, a5, 0 + bbsi.l a4, 0, .Lback5 + abi_ret_default +.Lback5: + # copy 1 byte + addi a3, a3, -1 + l8ui a6, a3, 0 + addi a5, a5, -1 + s8i a6, a5, 0 + abi_ret_default + +/* + * Destination is aligned, Source is unaligned + */ + + .align 4 +.Lbacksrcunaligned: + _beqz a4, .Lbackdone # avoid loading anything for zero-length copies + # copy 16 bytes per iteration for word-aligned dst and unaligned src + __ssa8 a3 # set shift amount from byte offset +#define SIM_CHECKS_ALIGNMENT 1 /* set to 1 when running on ISS with + * the lint or ferret client, or 0 + * to save a few cycles */ +#if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT + and a11, a3, a8 # save unalignment offset for below + sub a3, a3, a11 # align a3 +#endif + l32i a6, a3, 0 # load first word +#if XCHAL_HAVE_LOOPS + loopnez a7, .LbackLoop2done +#else /* !XCHAL_HAVE_LOOPS */ + beqz a7, .LbackLoop2done + slli a10, a7, 4 + sub a10, a3, a10 # a10 = start of first 16B source chunk +#endif /* !XCHAL_HAVE_LOOPS */ +.LbackLoop2: + addi a3, a3, -16 + l32i a7, a3, 12 + l32i a8, a3, 8 + addi a5, a5, -16 + __src_b a6, a7, a6 + s32i a6, a5, 12 + l32i a9, a3, 4 + __src_b a7, a8, a7 + s32i a7, a5, 8 + l32i a6, a3, 0 + __src_b a8, a9, a8 + s32i a8, a5, 4 + __src_b a9, a6, a9 + s32i a9, a5, 0 +#if !XCHAL_HAVE_LOOPS + bne a3, a10, .LbackLoop2 # continue loop if a3:src != a10:src_start +#endif /* !XCHAL_HAVE_LOOPS */ +.LbackLoop2done: + bbci.l a4, 3, .Lback12 + # copy 8 bytes + addi a3, a3, -8 + l32i a7, a3, 4 + l32i a8, a3, 0 + addi a5, a5, -8 + __src_b a6, a7, a6 + s32i a6, a5, 4 + __src_b a7, a8, a7 + s32i a7, a5, 0 + mov a6, a8 +.Lback12: + bbci.l a4, 2, .Lback13 + # copy 4 bytes + addi a3, a3, -4 + l32i a7, a3, 0 + addi a5, a5, -4 + __src_b a6, a7, a6 + s32i a6, a5, 0 + mov a6, a7 +.Lback13: +#if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT + add a3, a3, a11 # readjust a3 with correct misalignment +#endif + bbsi.l a4, 1, .Lback14 + bbsi.l a4, 0, .Lback15 +.Lbackdone: + abi_ret_default +.Lback14: + # copy 2 bytes + addi a3, a3, -2 + l8ui a6, a3, 0 + l8ui a7, a3, 1 + addi a5, a5, -2 + s8i a6, a5, 0 + s8i a7, a5, 1 + bbsi.l a4, 0, .Lback15 + abi_ret_default +.Lback15: + # copy 1 byte + addi a3, a3, -1 + addi a5, a5, -1 + l8ui a6, a3, 0 + s8i a6, a5, 0 + abi_ret_default + +ENDPROC(__memmove) +EXPORT_SYMBOL(__memmove) +EXPORT_SYMBOL(memmove) -- cgit v1.3.1