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| author | Zong Li <zong.li@sifive.com> | 2024-02-02 01:51:02 +0000 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2024-02-22 12:17:47 -0800 |
| commit | 680341382da56bd192ebfa4e58eaf4fec2e5bca7 (patch) | |
| tree | 60f39c539e677ba1a1b17691ae9188abd503781c /arch/riscv/include | |
| parent | 4af24146aa24d06f4594a427354f7ac878118d38 (diff) | |
| download | linux-stable-680341382da56bd192ebfa4e58eaf4fec2e5bca7.tar.gz linux-stable-680341382da56bd192ebfa4e58eaf4fec2e5bca7.tar.bz2 linux-stable-680341382da56bd192ebfa4e58eaf4fec2e5bca7.zip | |
riscv: add CALLER_ADDRx support
CALLER_ADDRx returns caller's address at specified level, they are used
for several tracers. These macros eventually use
__builtin_return_address(n) to get the caller's address if arch doesn't
define their own implementation.
In RISC-V, __builtin_return_address(n) only works when n == 0, we need
to walk the stack frame to get the caller's address at specified level.
data.level started from 'level + 3' due to the call flow of getting
caller's address in RISC-V implementation. If we don't have additional
three iteration, the level is corresponding to follows:
callsite -> return_address -> arch_stack_walk -> walk_stackframe
| | | |
level 3 level 2 level 1 level 0
Fixes: 10626c32e382 ("riscv/ftrace: Add basic support")
Cc: stable@vger.kernel.org
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Zong Li <zong.li@sifive.com>
Link: https://lore.kernel.org/r/20240202015102.26251-1-zong.li@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/include')
| -rw-r--r-- | arch/riscv/include/asm/ftrace.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/ftrace.h b/arch/riscv/include/asm/ftrace.h index 329172122952..15055f9df4da 100644 --- a/arch/riscv/include/asm/ftrace.h +++ b/arch/riscv/include/asm/ftrace.h @@ -25,6 +25,11 @@ #define ARCH_SUPPORTS_FTRACE_OPS 1 #ifndef __ASSEMBLY__ + +extern void *return_address(unsigned int level); + +#define ftrace_return_address(n) return_address(n) + void MCOUNT_NAME(void); static inline unsigned long ftrace_call_adjust(unsigned long addr) { |