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nuttx/arch/risc-v/include
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liang.huang b0c4b8ffda arch/risc-v: preserve ra across ecall for fp-chain backtrace 
sys_callN() wraps a bare ecall and calls no other function, so the
compiler treats it as a leaf function: with frame pointers enabled,
it only needs to spill the caller's s0, which it places in what
up_backtrace()'s fp-chain walk assumes is ra's stack slot, while the
real ra slot is never written. sched_backtrace() then misreads that
slot as the return address for this frame, either resolving to a
bogus symbol or, if the adjacent garbage happens to look
out-of-range, terminating the backtrace early.

Add "ra" to the ecall clobber list so the compiler spills/reloads ra
around the ecall like a normal call site, keeping ra and the saved
s0 in their expected slots. Gate this on
CONFIG_FRAME_POINTER && CONFIG_SCHED_BACKTRACE, the only combination
where up_backtrace()'s fp-chain walk is both valid (FRAME_POINTER)
and actually exercised (SCHED_BACKTRACE); other configurations keep
the original "memory"-only clobber and pay no extra cost.

This only fixes the syscall boundary. Leaf functions that do not
cross a syscall (e.g. up_idle()) can still lose their ra slot the
same way and are not addressed here.

Signed-off-by: liang.huang <liang.huang@houmo.ai>
2026-08-03 20:58:32 +08:00
..
bl602 arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
bl808 risc-v/bl808: Add I2C driver 2024-12-25 11:03:26 +08:00
c906 arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
eic7700x arch/risc-v/eic7700x: Add support for ESWIN EIC7700X SoC 2025-03-04 09:27:48 -05:00
esp32c3 arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
esp32c3-legacy arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
esp32c6 arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
esp32h2 arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
esp32p4 arch/risc-v/espressif/esp32p4: Support ESP32-P4 on NuttX 2026-03-09 21:40:25 +01:00
fe310 arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
hpm6000 arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
hpm6750 arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
jh7110 arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
k210 arch/risc-v/k210: Remove QEMU support 2026-03-23 14:25:29 +08:00
k230 arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
litex arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
mpfs arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
qemu-rv arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
rp23xx-rv arch/risc-v/rp23xx-riscv: Add rp23xx RISC-V cores support (Hazard3) 2025-08-11 08:56:27 +08:00
rv32m1 arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
sg2000 arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
thead arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
.gitignore
arch.h arch/risc-v/rp23xx-riscv: Add rp23xx RISC-V cores support (Hazard3) 2025-08-11 08:56:27 +08:00
barriers.h arch/riscv: Add CONFIG_ARCH_RV_ISA_ZICSR_ZIFENCEI for fence.i 2026-07-04 02:00:04 +08:00
csr.h risc-v: Move CSR register manipulation macros to csr.h 2024-12-13 01:29:26 +08:00
elf.h arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
inttypes.h arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
irq.h arch: rename STACK_ALIGNMENT to STACKFRAME_ALIGN across all architectures 2026-01-22 15:37:24 +08:00
limits.h arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
mode.h arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
setjmp.h arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
spinlock.h arch/riscv: use UP_DSB, UP_DMB, UP_ISB as barrier standard API 2025-01-20 20:13:07 +08:00
stdarg.h arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00
syscall.h arch/risc-v: preserve ra across ecall for fp-chain backtrace 2026-08-03 20:58:32 +08:00
types.h arch/risk-v: migrate to SPDX identifier 2024-12-02 17:23:25 +08:00