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riscv: kprobes: add test case for c.jal instruction simulation

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Add a test case validating that kprobes correctly simulates the
c.jal instruction on RV32.

The test uses two probe points: a forward c.jal and a backward
c.jal, and verifies that the containing function returns the
expected magic value KPROBE_TEST_MAGIC after kprobe interception.

Co-developed-by: Xiaofeng Yuan <xiaofengmian@163.com>
Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Xiaofeng Yuan <xiaofengmian@163.com>
Reviewed-by: Charlie Jenkins <thecharlesjenkins@gmail.com>
Tested-by: Charlie Jenkins <thecharlesjenkins@gmail.com>
Link: https://patch.msgid.link/20260701081033.49871-3-xiaofengmian@163.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>
This commit is contained in:
Nam Cao 2026-08-07 19:24:29 -06:00 committed by Paul Walmsley
parent 540ad5ad05
commit 0d4a777c4c
1 changed files with 24 additions and 0 deletions
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24
arch/riscv/kernel/tests/kprobes/test-kprobes-asm.S
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@ -179,6 +179,23 @@ test_kprobes_c_bnez_addr3:
ret
SYM_FUNC_END(test_kprobes_c_bnez)
#ifdef CONFIG_32BIT
SYM_FUNC_START(test_kprobes_c_jal)
li a0, 0
mv a1, ra
test_kprobes_c_jal_addr1:
c.jal 2f
ret
1: li a0, KPROBE_TEST_MAGIC_UPPER
ret
test_kprobes_c_jal_addr2:
2: c.jal 1b
li a2, KPROBE_TEST_MAGIC_LOWER
add a0, a0, a2
jr a1
SYM_FUNC_END(test_kprobes_c_jal)
#endif
#endif /* CONFIG_RISCV_ISA_C */
.section .rodata
@ -209,6 +226,10 @@ SYM_DATA_START(test_kprobes_addresses)
RISCV_PTR test_kprobes_c_bnez_addr1
RISCV_PTR test_kprobes_c_bnez_addr2
RISCV_PTR test_kprobes_c_bnez_addr3
#ifdef CONFIG_32BIT
RISCV_PTR test_kprobes_c_jal_addr1
RISCV_PTR test_kprobes_c_jal_addr2
#endif
#endif /* CONFIG_RISCV_ISA_C */
RISCV_PTR 0
SYM_DATA_END(test_kprobes_addresses)
@ -226,6 +247,9 @@ SYM_DATA_START(test_kprobes_functions)
RISCV_PTR test_kprobes_c_jalr
RISCV_PTR test_kprobes_c_beqz
RISCV_PTR test_kprobes_c_bnez
#ifdef CONFIG_32BIT
RISCV_PTR test_kprobes_c_jal
#endif
#endif /* CONFIG_RISCV_ISA_C */
RISCV_PTR 0
SYM_DATA_END(test_kprobes_functions)