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| author | Binglei Wang <l3b2w1@gmail.com> | 2022-10-25 18:18:32 +0300 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2022-12-03 00:04:05 +0300 |
| commit | b57c2f124098459a4acc15d5044f87cba31c87f0 (patch) | |
| tree | bd9a0471f636f1ff67f592158e2d25c83ab6994a /arch/riscv/kernel/probes/rethook_trampoline.S | |
| parent | d8bf77a1dc3079692f54be3087a5fd16d90027b0 (diff) | |
| download | linux-b57c2f124098459a4acc15d5044f87cba31c87f0.tar.xz | |
riscv: add riscv rethook implementation
Implement the kretprobes on riscv arch by using rethook machenism
which abstracts general kretprobe info into a struct rethook_node
to be embedded in the struct kretprobe_instance.
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Binglei Wang <l3b2w1@gmail.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20221025151831.1097417-1-conor@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/kernel/probes/rethook_trampoline.S')
| -rw-r--r-- | arch/riscv/kernel/probes/rethook_trampoline.S | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/arch/riscv/kernel/probes/rethook_trampoline.S b/arch/riscv/kernel/probes/rethook_trampoline.S new file mode 100644 index 000000000000..21bac92a170a --- /dev/null +++ b/arch/riscv/kernel/probes/rethook_trampoline.S @@ -0,0 +1,93 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Author: Patrick Stählin <me@packi.ch> + */ +#include <linux/linkage.h> + +#include <asm/asm.h> +#include <asm/asm-offsets.h> + + .text + .altmacro + + .macro save_all_base_regs + REG_S x1, PT_RA(sp) + REG_S x3, PT_GP(sp) + REG_S x4, PT_TP(sp) + REG_S x5, PT_T0(sp) + REG_S x6, PT_T1(sp) + REG_S x7, PT_T2(sp) + REG_S x8, PT_S0(sp) + REG_S x9, PT_S1(sp) + REG_S x10, PT_A0(sp) + REG_S x11, PT_A1(sp) + REG_S x12, PT_A2(sp) + REG_S x13, PT_A3(sp) + REG_S x14, PT_A4(sp) + REG_S x15, PT_A5(sp) + REG_S x16, PT_A6(sp) + REG_S x17, PT_A7(sp) + REG_S x18, PT_S2(sp) + REG_S x19, PT_S3(sp) + REG_S x20, PT_S4(sp) + REG_S x21, PT_S5(sp) + REG_S x22, PT_S6(sp) + REG_S x23, PT_S7(sp) + REG_S x24, PT_S8(sp) + REG_S x25, PT_S9(sp) + REG_S x26, PT_S10(sp) + REG_S x27, PT_S11(sp) + REG_S x28, PT_T3(sp) + REG_S x29, PT_T4(sp) + REG_S x30, PT_T5(sp) + REG_S x31, PT_T6(sp) + .endm + + .macro restore_all_base_regs + REG_L x3, PT_GP(sp) + REG_L x4, PT_TP(sp) + REG_L x5, PT_T0(sp) + REG_L x6, PT_T1(sp) + REG_L x7, PT_T2(sp) + REG_L x8, PT_S0(sp) + REG_L x9, PT_S1(sp) + REG_L x10, PT_A0(sp) + REG_L x11, PT_A1(sp) + REG_L x12, PT_A2(sp) + REG_L x13, PT_A3(sp) + REG_L x14, PT_A4(sp) + REG_L x15, PT_A5(sp) + REG_L x16, PT_A6(sp) + REG_L x17, PT_A7(sp) + REG_L x18, PT_S2(sp) + REG_L x19, PT_S3(sp) + REG_L x20, PT_S4(sp) + REG_L x21, PT_S5(sp) + REG_L x22, PT_S6(sp) + REG_L x23, PT_S7(sp) + REG_L x24, PT_S8(sp) + REG_L x25, PT_S9(sp) + REG_L x26, PT_S10(sp) + REG_L x27, PT_S11(sp) + REG_L x28, PT_T3(sp) + REG_L x29, PT_T4(sp) + REG_L x30, PT_T5(sp) + REG_L x31, PT_T6(sp) + .endm + +ENTRY(arch_rethook_trampoline) + addi sp, sp, -(PT_SIZE_ON_STACK) + save_all_base_regs + + move a0, sp /* pt_regs */ + + call arch_rethook_trampoline_callback + + /* use the result as the return-address */ + move ra, a0 + + restore_all_base_regs + addi sp, sp, PT_SIZE_ON_STACK + + ret +ENDPROC(arch_rethook_trampoline) |