Changes in entry.S

cb8a2ef0 - LoongArch: Add ORC stack unwinder support

Mon, 11 Mar 2024 14:23:47 +0000

LoongArch: Add ORC stack unwinder supportThe kernel CONFIG_UNWINDER_ORC option enables the ORC unwinder, which issimilar in concept to a DWARF unwinder. The difference is that the formatof the ORC data is much simpler than DWARF, which in turn allows the ORCunwinder 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 informationabout the stack state at each instruction address in the file and outputsthat information to the .orc_unwind and .orc_unwind_ip sections.The per-object ORC sections are combined at link time and are sorted andpost-processed at boot time. The unwinder uses the resulting data tocorrelate instruction addresses with their stack states at run time.Most of the logic are similar with x86, in order to get ra info before rais saved into stack, add ra_reg and ra_offset into orc_entry. At the sametime, modify some arch-specific code to silence the objtool warnings.Co-developed-by: Jinyang He Signed-off-by: Jinyang He Co-developed-by: Youling Tang Signed-off-by: Youling Tang Signed-off-by: Tiezhu Yang Signed-off-by: Huacai Chen List of files: /linux-6.15/arch/loongarch/kernel/entry.S

00c2ca84 - LoongArch: Use SYM_CODE_* to annotate exception handlers

Wed, 18 Oct 2023 00:42:52 +0000

LoongArch: Use SYM_CODE_* to annotate exception handlersAs described in include/linux/linkage.h, FUNC -- C-like functions (proper stack frame etc.) CODE -- non-C code (e.g. irq handlers with different, special stack etc.) SYM_FUNC_{START, END} -- use for global functions SYM_CODE_{START, END} -- use for non-C (special) functionsSo use SYM_CODE_* to annotate exception handlers.Signed-off-by: Tiezhu Yang Signed-off-by: Huacai Chen List of files: /linux-6.15/arch/loongarch/kernel/entry.S

e14dd076 - LoongArch: Add basic KGDB & KDB support

Wed, 06 Sep 2023 14:53:55 +0000

LoongArch: Add basic KGDB & KDB supportKGDB is intended to be used as a source level debugger for the Linuxkernel. It is used along with gdb to debug a Linux kernel. GDB can beused to "break in" to the kernel to inspect memory, variables and regssimilar to the way an application developer would use GDB to debug anapplication. KDB is a frontend of KGDB which is similar to GDB.By now, in addition to the generic KGDB features, the LoongArch KGDBimplements the following features:- Hardware breakpoints/watchpoints;- Software single-step support for KDB.Signed-off-by: Qing Zhang # Framework & CoreFeatureSigned-off-by: Binbin Zhou # BreakPoint & SingleStepSigned-off-by: Hui Li # Some Minor ImprovementsSigned-off-by: Randy Dunlap # Some Build Error FixesSigned-off-by: Huacai Chen List of files: /linux-6.15/arch/loongarch/kernel/entry.S

fcf77d01 - LoongArch: Mark some assembler symbols as non-kprobe-able

Sat, 25 Feb 2023 07:52:57 +0000

LoongArch: Mark some assembler symbols as non-kprobe-ableSome assembler symbols are not kprobe safe, such as handle_syscall (usedas syscall exception handler), *memset*/*memcpy*/*memmove* (may causerecursive exceptions), they can not be instrumented, just blacklist themfor kprobing.Here is a related problem and discussion:Link: https://lore.kernel.org/lkml/20230114143859.7ccc45c1c5d9ce302113ab0a@kernel.org/Tested-by: Jeff Xie Signed-off-by: Tiezhu Yang Signed-off-by: Huacai Chen List of files: /linux-6.15/arch/loongarch/kernel/entry.S

f733f119 - LoongArch: Use la.pcrel instead of la.abs when it's trivially possible

Sat, 25 Feb 2023 07:52:56 +0000

LoongArch: Use la.pcrel instead of la.abs when it's trivially possibleLet's start to kill la.abs in preparation for the subsequent support ofthe PIE kernel.BTW, Re-tab the indention in arch/loongarch/kernel/entry.S for alignment.Signed-off-by: Xi Ruoyao Signed-off-by: Huacai Chen List of files: /linux-6.15/arch/loongarch/kernel/entry.S

f5c3c22f - LoongArch: Re-tab the assembly files

Tue, 26 Jul 2022 15:57:22 +0000

LoongArch: Re-tab the assembly filesReflow the *.S files for better stylistic consistency, namely hard tabsafter mnemonic position, and vertical alignment of the first operandwith hard tabs. Tab width is obviously 8. Some pre-existing intra-blockvertical alignments are preserved.Signed-off-by: WANG Xuerui Signed-off-by: Huacai Chen List of files: /linux-6.15/arch/loongarch/kernel/entry.S

be769645 - LoongArch: Add system call support

Tue, 31 May 2022 10:04:11 +0000

LoongArch: Add system call supportAdd system call support and related uaccess.h for LoongArch.Q: Why keep _ARCH_WANT_SYS_CLONE definition while there is clone3:A: The latest glibc release has some basic support for clone3 but it is not complete. E.g., pthread_create() and spawni() have converted to use clone3 but fork() will still use clone. Moreover, some seccomp related applications can still not work perfectly with clone3. E.g., Chromium sandbox cannot work at all and there is no solution for it, which is more terrible than the fork() story [1].[1] https://chromium-review.googlesource.com/c/chromium/src/+/2936184Reviewed-by: WANG Xuerui Reviewed-by: Jiaxun Yang Signed-off-by: Huacai Chen List of files: /linux-6.15/arch/loongarch/kernel/entry.S