diff options
| author | Jinjie Ruan <[email protected]> | 2024-07-08 11:28:46 +0800 |
|---|---|---|
| committer | Palmer Dabbelt <[email protected]> | 2024-09-14 23:57:15 -0700 |
| commit | 22ab08955ea13be04a8efd20cc30890e0afaa49c (patch) | |
| tree | 9089824839f440ba8cea0d3210607f538e3da2a7 | |
| parent | 8400291e289ee6b2bf9779ff1c83a291501f017b (diff) | |
riscv: Fix fp alignment bug in perf_callchain_user()
The standard RISC-V calling convention said:
"The stack grows downward and the stack pointer is always
kept 16-byte aligned".
So perf_callchain_user() should check whether 16-byte aligned for fp.
Link: https://riscv.org/wp-content/uploads/2015/01/riscv-calling.pdf
Fixes: dbeb90b0c1eb ("riscv: Add perf callchain support")
Signed-off-by: Jinjie Ruan <[email protected]>
Cc: Björn Töpel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>
| -rw-r--r-- | arch/riscv/kernel/perf_callchain.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/riscv/kernel/perf_callchain.c b/arch/riscv/kernel/perf_callchain.c index 3348a61de7d9..2932791e9388 100644 --- a/arch/riscv/kernel/perf_callchain.c +++ b/arch/riscv/kernel/perf_callchain.c @@ -62,7 +62,7 @@ void perf_callchain_user(struct perf_callchain_entry_ctx *entry, perf_callchain_store(entry, regs->epc); fp = user_backtrace(entry, fp, regs->ra); - while (fp && !(fp & 0x3) && entry->nr < entry->max_stack) + while (fp && !(fp & 0x7) && entry->nr < entry->max_stack) fp = user_backtrace(entry, fp, 0); } |