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/arm/nwfpe/softfloat.h | 281 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 281 insertions(+) create mode 100644 arch/arm/nwfpe/softfloat.h (limited to 'arch/arm/nwfpe/softfloat.h') diff --git a/arch/arm/nwfpe/softfloat.h b/arch/arm/nwfpe/softfloat.h new file mode 100644 index 000000000..df4d243a2 --- /dev/null +++ b/arch/arm/nwfpe/softfloat.h @@ -0,0 +1,281 @@ + +/* +=============================================================================== + +This C header file is part of the SoftFloat IEC/IEEE Floating-point +Arithmetic Package, Release 2. + +Written by John R. Hauser. This work was made possible in part by the +International Computer Science Institute, located at Suite 600, 1947 Center +Street, Berkeley, California 94704. Funding was partially provided by the +National Science Foundation under grant MIP-9311980. The original version +of this code was written as part of a project to build a fixed-point vector +processor in collaboration with the University of California at Berkeley, +overseen by Profs. Nelson Morgan and John Wawrzynek. More information +is available through the Web page +http://www.jhauser.us/arithmetic/SoftFloat-2b/SoftFloat-source.txt + +THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort +has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT +TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO +PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY +AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE. + +Derivative works are acceptable, even for commercial purposes, so long as +(1) they include prominent notice that the work is derivative, and (2) they +include prominent notice akin to these three paragraphs for those parts of +this code that are retained. + +=============================================================================== +*/ + +#ifndef __SOFTFLOAT_H__ +#define __SOFTFLOAT_H__ + + +/* +------------------------------------------------------------------------------- +The macro `FLOATX80' must be defined to enable the extended double-precision +floating-point format `floatx80'. If this macro is not defined, the +`floatx80' type will not be defined, and none of the functions that either +input or output the `floatx80' type will be defined. +------------------------------------------------------------------------------- +*/ +#ifdef CONFIG_FPE_NWFPE_XP +#define FLOATX80 +#endif + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE floating-point types. +------------------------------------------------------------------------------- +*/ +typedef u32 float32; +typedef u64 float64; +typedef struct { +#ifdef __ARMEB__ + u16 __padding; + u16 high; +#else + u16 high; + u16 __padding; +#endif + u64 low; +} __attribute__ ((packed,aligned(4))) floatx80; + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE floating-point underflow tininess-detection mode. +------------------------------------------------------------------------------- +*/ +extern signed char float_detect_tininess; +enum { + float_tininess_after_rounding = 0, + float_tininess_before_rounding = 1 +}; + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE floating-point rounding mode. +------------------------------------------------------------------------------- +*/ +//extern int8 float_rounding_mode; +enum { + float_round_nearest_even = 0, + float_round_to_zero = 1, + float_round_down = 2, + float_round_up = 3 +}; + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE floating-point exception flags. +------------------------------------------------------------------------------- +enum { + float_flag_inexact = 1, + float_flag_underflow = 2, + float_flag_overflow = 4, + float_flag_divbyzero = 8, + float_flag_invalid = 16 +}; + +ScottB: November 4, 1998 +Changed the enumeration to match the bit order in the FPA11. +*/ + +enum { + float_flag_invalid = 1, + float_flag_divbyzero = 2, + float_flag_overflow = 4, + float_flag_underflow = 8, + float_flag_inexact = 16 +}; + +/* +------------------------------------------------------------------------------- +Routine to raise any or all of the software IEC/IEEE floating-point +exception flags. +------------------------------------------------------------------------------- +*/ +void float_raise( signed char ); + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE integer-to-floating-point conversion routines. +------------------------------------------------------------------------------- +*/ +float32 int32_to_float32( struct roundingData *, signed int ); +float64 int32_to_float64( signed int ); +#ifdef FLOATX80 +floatx80 int32_to_floatx80( signed int ); +#endif + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE single-precision conversion routines. +------------------------------------------------------------------------------- +*/ +signed int float32_to_int32( struct roundingData *, float32 ); +signed int float32_to_int32_round_to_zero( float32 ); +float64 float32_to_float64( float32 ); +#ifdef FLOATX80 +floatx80 float32_to_floatx80( float32 ); +#endif + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE single-precision operations. +------------------------------------------------------------------------------- +*/ +float32 float32_round_to_int( struct roundingData*, float32 ); +float32 float32_add( struct roundingData *, float32, float32 ); +float32 float32_sub( struct roundingData *, float32, float32 ); +float32 float32_mul( struct roundingData *, float32, float32 ); +float32 float32_div( struct roundingData *, float32, float32 ); +float32 float32_rem( struct roundingData *, float32, float32 ); +float32 float32_sqrt( struct roundingData*, float32 ); +char float32_eq( float32, float32 ); +char float32_le( float32, float32 ); +char float32_lt( float32, float32 ); +char float32_eq_signaling( float32, float32 ); +char float32_le_quiet( float32, float32 ); +char float32_lt_quiet( float32, float32 ); +char float32_is_signaling_nan( float32 ); + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE double-precision conversion routines. +------------------------------------------------------------------------------- +*/ +signed int float64_to_int32( struct roundingData *, float64 ); +signed int float64_to_int32_round_to_zero( float64 ); +float32 float64_to_float32( struct roundingData *, float64 ); +#ifdef FLOATX80 +floatx80 float64_to_floatx80( float64 ); +#endif + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE double-precision operations. +------------------------------------------------------------------------------- +*/ +float64 float64_round_to_int( struct roundingData *, float64 ); +float64 float64_add( struct roundingData *, float64, float64 ); +float64 float64_sub( struct roundingData *, float64, float64 ); +float64 float64_mul( struct roundingData *, float64, float64 ); +float64 float64_div( struct roundingData *, float64, float64 ); +float64 float64_rem( struct roundingData *, float64, float64 ); +float64 float64_sqrt( struct roundingData *, float64 ); +char float64_eq( float64, float64 ); +char float64_le( float64, float64 ); +char float64_lt( float64, float64 ); +char float64_eq_signaling( float64, float64 ); +char float64_le_quiet( float64, float64 ); +char float64_lt_quiet( float64, float64 ); +char float64_is_signaling_nan( float64 ); + +#ifdef FLOATX80 + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE extended double-precision conversion routines. +------------------------------------------------------------------------------- +*/ +signed int floatx80_to_int32( struct roundingData *, floatx80 ); +signed int floatx80_to_int32_round_to_zero( floatx80 ); +float32 floatx80_to_float32( struct roundingData *, floatx80 ); +float64 floatx80_to_float64( struct roundingData *, floatx80 ); + +/* +------------------------------------------------------------------------------- +Software IEC/IEEE extended double-precision operations. +------------------------------------------------------------------------------- +*/ +floatx80 floatx80_round_to_int( struct roundingData *, floatx80 ); +floatx80 floatx80_add( struct roundingData *, floatx80, floatx80 ); +floatx80 floatx80_sub( struct roundingData *, floatx80, floatx80 ); +floatx80 floatx80_mul( struct roundingData *, floatx80, floatx80 ); +floatx80 floatx80_div( struct roundingData *, floatx80, floatx80 ); +floatx80 floatx80_rem( struct roundingData *, floatx80, floatx80 ); +floatx80 floatx80_sqrt( struct roundingData *, floatx80 ); +char floatx80_eq( floatx80, floatx80 ); +char floatx80_le( floatx80, floatx80 ); +char floatx80_lt( floatx80, floatx80 ); +char floatx80_eq_signaling( floatx80, floatx80 ); +char floatx80_le_quiet( floatx80, floatx80 ); +char floatx80_lt_quiet( floatx80, floatx80 ); +char floatx80_is_signaling_nan( floatx80 ); + +extern flag floatx80_is_nan(floatx80); + +#endif + +static inline flag extractFloat32Sign(float32 a) +{ + return a >> 31; +} + +static inline flag float32_eq_nocheck(float32 a, float32 b) +{ + return (a == b) || ((bits32) ((a | b) << 1) == 0); +} + +static inline flag float32_lt_nocheck(float32 a, float32 b) +{ + flag aSign, bSign; + + aSign = extractFloat32Sign(a); + bSign = extractFloat32Sign(b); + if (aSign != bSign) + return aSign && ((bits32) ((a | b) << 1) != 0); + return (a != b) && (aSign ^ (a < b)); +} + +static inline flag extractFloat64Sign(float64 a) +{ + return a >> 63; +} + +static inline flag float64_eq_nocheck(float64 a, float64 b) +{ + return (a == b) || ((bits64) ((a | b) << 1) == 0); +} + +static inline flag float64_lt_nocheck(float64 a, float64 b) +{ + flag aSign, bSign; + + aSign = extractFloat64Sign(a); + bSign = extractFloat64Sign(b); + if (aSign != bSign) + return aSign && ((bits64) ((a | b) << 1) != 0); + return (a != b) && (aSign ^ (a < b)); +} + +extern flag float32_is_nan( float32 a ); +extern flag float64_is_nan( float64 a ); + +extern int32 float64_to_uint32( struct roundingData *roundData, float64 a ); +extern int32 float64_to_uint32_round_to_zero( float64 a ); + +#endif -- cgit v1.3.1