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[RFC] add riscv64 kpatch-build support #1529

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[RFC] add riscv64 kpatch-build support #1529

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f290393
create-diff-object: ignore _error_injection_whitelist section changes
qiruibd Jul 15, 2026
7ee9124
create-diff-object: fix .kpatch.ignore.sections string offset calcula…
qiruibd Jul 15, 2026
d96f091
kpatch: fall back to modinfo for module names
qiruibd Jul 29, 2026
481518c
integration: handle CONFIG_PRINTK_CALLER in dmesg marker matching
qiruibd Jul 29, 2026
08caff5
kpatch-build: fall back to unprefixed ld.lld
qiruibd Oct 5, 2026
37667a1
kpatch-build: add riscv64 architecture support
qiruibd Sep 22, 2026
759c92b
create-diff-object: add RISC-V ftrace callsite support
qiruibd Sep 22, 2026
2c96286
kpatch-elf: handle RISC-V mapping symbols and local labels
qiruibd Sep 22, 2026
2a31d18
create-diff-object: implement insn_is_load_immediate() for RISC-V
qiruibd Jul 10, 2026
e09083c
create-diff-object: add RISC-V special section handling
qiruibd Sep 21, 2026
bfe1a07
create-diff-object: add RISC-V .alternative handling
qiruibd Sep 22, 2026
b32ad07
create-diff-object: handle RISC-V __jump_table relocs
qiruibd Sep 22, 2026
051b155
create-diff-object: fix RISC-V special-section anchors
qiruibd Sep 22, 2026
ce43293
create-diff-object: add RISC-V intermediate relocation metadata
qiruibd Sep 24, 2026
1bd333c
create-klp-module: add RISC-V KLP relocation slots
qiruibd Sep 25, 2026
75582e5
create-klp-module: support RISC-V PC-relative loads
qiruibd Sep 25, 2026
cc56e2d
create-diff-object: skip relocs to sections without allocated data
qiruibd Sep 21, 2026
0d63d0f
create-diff-object: retain symbols used by debug relocs
qiruibd Sep 22, 2026
f63200d
kpatch-syscall: add RISC-V syscall wrapper macro support
qiruibd Jul 15, 2026
ecb4276
kpatch-build: add RISC-V skip-vmlinux final-link flow
qiruibd Sep 29, 2026
5731d66
kpatch-build: restrict RISC-V skip-link to vmlinux objects
qiruibd Sep 29, 2026
45da8d5
test: reject RISC-V skip-link module patches
qiruibd Sep 28, 2026
4f82a1c
test/unit: update objs submodule for RISC-V test objects
qiruibd Jul 15, 2026
43db961
test: add RISC-V test harness support
qiruibd Sep 22, 2026
e94c642
test: add Linux 6.12.95 integration tests
qiruibd Sep 21, 2026
e31c7a5
test: count functions by ELF symbol type
qiruibd Sep 30, 2026
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21 changes: 21 additions & 0 deletions kmod/patch/kpatch-syscall.h
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Original file line number Diff line number Diff line change
Expand Up @@ -236,6 +236,27 @@
} \
static inline long __kpatch_do_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))

#elif defined(CONFIG_RISCV)

/* arch/riscv/include/asm/syscall_wrapper.h versions */

#define __KPATCH_SYSCALL_DEFINEx(x, name, ...) \
asmlinkage long __riscv_sys##name(const struct pt_regs *regs); \
ALLOW_ERROR_INJECTION(__riscv_sys##name, ERRNO); \
static inline long __kpatch_do_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__));\
__SYSCALL_SE_DEFINEx(x, sys, name, __VA_ARGS__) \
{ \
long ret = __kpatch_do_sys##name(__MAP(x, __SC_CAST, __VA_ARGS__));\
__MAP(x, __SC_TEST, __VA_ARGS__); \
__PROTECT(x, ret, __MAP(x, __SC_ARGS, __VA_ARGS__)); \
return ret; \
} \
asmlinkage long __riscv_sys##name(const struct pt_regs *regs) \
{ \
return __se_sys##name(SC_RISCV_REGS_TO_ARGS(x, __VA_ARGS__)); \
} \
static inline long __kpatch_do_sys##name(__MAP(x, __SC_DECL, __VA_ARGS__))

#endif /* which arch */


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2 changes: 1 addition & 1 deletion kpatch-build/Makefile
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Expand Up @@ -21,7 +21,7 @@ PLUGIN_CFLAGS := $(filter-out -std=gnu11 -Wconversion, $(CFLAGS))
PLUGIN_CFLAGS += -shared -I$(GCC_PLUGINS_DIR)/include \
-Igcc-plugins -fPIC -fno-rtti -O2 -Wall
endif
ifeq ($(filter $(ARCH),s390x x86_64 ppc64le aarch64 loongarch64),)
ifeq ($(filter $(ARCH),s390x x86_64 ppc64le aarch64 loongarch64 riscv64),)
$(error Unsupported architecture ${ARCH}, check https://github.com/dynup/kpatch/#supported-architectures)
endif

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