Hosts the 0x221E linux distro kernel. https://git.0xinfinity.dev/distro/kernel.git/atom?h=linux-6.19.y 2025-10-02T14:39:35Z 2025-10-02T14:39:35Z Tiezhu Yang 2025-10-02T14:39:35Z urn:sha1:db740f5689e61f2e75b73e5c8e7c985a3b4bc045 The atomic instructions sc.q, llacq.{w/d}, screl.{w/d} were newly added in the LoongArch Reference Manual v1.10, it is necessary to handle them in insns_not_supported() to avoid putting a breakpoint in the middle of a ll/sc atomic sequence, otherwise it will loop forever for kprobes and uprobes. Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2025-08-05T11:00:18Z Chenghao Duan 2025-08-05T11:00:18Z urn:sha1:9fbd18cf4c69f512f7de3ab73235078f3e32ecec This commit adds support for BPF dynamic code modification on the LoongArch architecture: 1. Add bpf_arch_text_copy() for instruction block copying. 2. Add bpf_arch_text_poke() for runtime instruction patching. 3. Add bpf_arch_text_invalidate() for code invalidation. On LoongArch, since symbol addresses in the direct mapping region can't be reached via relative jump instructions from the paged mapping region, we use the move_imm+jirl instruction pair as absolute jump instructions. These require 2-5 instructions, so we reserve 5 NOP instructions in the program as placeholders for function jumps. The larch_insn_text_copy() function is solely used for BPF. And the use of larch_insn_text_copy() requires PAGE_SIZE alignment. Currently, only the size of the BPF trampoline is page-aligned. Co-developed-by: George Guo <guodongtai@kylinos.cn> Signed-off-by: George Guo <guodongtai@kylinos.cn> Signed-off-by: Chenghao Duan <duanchenghao@kylinos.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2025-08-03T14:49:50Z Chenghao Duan 2025-08-03T14:49:50Z urn:sha1:6ab55e0a9eac638ca390bfaef6408c10c127e623 Add larch_insn_gen_beq() and larch_insn_gen_bne() helpers which will be used in BPF trampoline implementation. Reviewed-by: Hengqi Chen <hengqi.chen@gmail.com> Co-developed-by: George Guo <guodongtai@kylinos.cn> Signed-off-by: George Guo <guodongtai@kylinos.cn> Co-developed-by: Youling Tang <tangyouling@kylinos.cn> Signed-off-by: Youling Tang <tangyouling@kylinos.cn> Signed-off-by: Chenghao Duan <duanchenghao@kylinos.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2024-12-02T08:42:08Z Tiezhu Yang 2024-12-02T08:42:08Z urn:sha1:c1474bb0b7cff4e8481095bd0618b8f6c2f0aeb4 The branch instructions beq, bne, blt, bge, bltu, bgeu and jirl belong to the format reg2i16, but the sequence of oprand is different for the instruction jirl. So adjust the parameter order of emit_jirl() to make it more readable correspond with the Instruction Set Architecture manual. Here are the instruction formats: beq rj, rd, offs16 bne rj, rd, offs16 blt rj, rd, offs16 bge rj, rd, offs16 bltu rj, rd, offs16 bgeu rj, rd, offs16 jirl rd, rj, offs16 Link: https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#branch-instructions Suggested-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2023-06-29T12:58:44Z Tiezhu Yang 2023-06-29T12:58:44Z urn:sha1:49ed320da5f52ec729e7f2f9edbc6e79848455bd There exist various break insns such as BRK_KPROBE_BP, BRK_KPROBE_SSTEPBP, BRK_UPROBE_BP and BRK_UPROBE_XOLBP, add larch_insn_gen_break() to generate break insns simpler, this is preparation for later patch. Tested-by: Jeff Xie <xiehuan09@gmail.com> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2023-06-29T12:58:44Z Tiezhu Yang 2023-06-29T12:58:44Z urn:sha1:b82fad4d5deb2c2a15fdb581a1e6725dcea666e7 Like llsc instructions, the atomic memory access instructions shouldn't be supported for probing, so check for them in insns_not_supported(). Closes: https://lore.kernel.org/all/SY4P282MB351877A70A0333C790FE85A5C09C9@SY4P282MB3518.AUSP282.PROD.OUTLOOK.COM/ Tested-by: Jeff Xie <xiehuan09@gmail.com> Reported-by: Hengqi Chen <hengqi.chen@gmail.com> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2023-06-29T12:58:44Z Tiezhu Yang 2023-06-29T12:58:44Z urn:sha1:3d2c3daf82544283c5597028a8a3efc9ac0fb02b The three functions insns_not_supported(), insns_need_simulation() and arch_simulate_insn() will be used for uprobes, move them from kprobes.c to inst.c, this is preparation for later patch, no functionality change. Tested-by: Jeff Xie <xiehuan09@gmail.com> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2023-06-29T12:58:42Z WANG Rui 2023-06-29T12:58:42Z urn:sha1:0d03e9dce5c91d841a35af05ca61a5cf318f5064 Add guard for the larch_insn_gen_xxx functions to verify whether the immediate operand is within the acceptable range. Signed-off-by: WANG Rui <wangrui@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2023-02-25T14:12:17Z Tiezhu Yang 2023-02-25T07:52:57Z urn:sha1:9b3441a6b0e1ed4796e7f5a8586c4d6023c4e3ab According to LoongArch Reference Manual, simulate branch and PC* instructions, this is preparation for later patch. Link: https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#branch-instructions Link: https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#_pcaddi_pcaddu121_pcaddu18l_pcalau12i Tested-by: Jeff Xie <xiehuan09@gmail.com> Co-developed-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2023-01-17T03:42:16Z Youling Tang 2023-01-17T03:42:16Z urn:sha1:3200983fa8e2c8aa17ed911b617b4a248bcb1267 Simplify larch_insn_gen_xxx implementation by reusing emit_xxx. Signed-off-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>