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da968584be
up_backtrace() on a different tcb dereferences that task's own stack to walk its frame pointer chain, but never selected that task's address environment first. Under CONFIG_ARCH_ADDRENV each task's stack lives behind its own page tables mapped at the same fixed virtual range, so reading tcb->stack_base_ptr without first switching to that task's addrenv reads whatever physical page the caller's own mapping of that virtual range happens to point to, not the target task's real stack. A cross-tid dumpstack of a task running in a different address environment therefore returns garbage or an all-zero backtrace instead of failing cleanly or resolving the real call chain. Add an addrenv parameter to backtrace() and select the target tcb's addrenv_own only around the two dereferences that read the target's saved ra/fp (ra = *(fp - 1), next_fp = *(fp - 2)), then restore the caller's own addrenv before writing the result into buffer. buffer belongs to the caller, not the target tcb, so it must always be written back in the caller's own address environment; writing it while the target's addrenv is still selected would corrupt the access instead of fixing it. Signed-off-by: liang.huang <liang.huang@houmo.ai> |
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| arm | ||
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| avr | ||
| ceva | ||
| dummy | ||
| hc | ||
| mips | ||
| misoc | ||
| or1k | ||
| renesas | ||
| risc-v | ||
| sim | ||
| sparc | ||
| tricore | ||
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| xtensa | ||
| z16 | ||
| z80 | ||
| CMakeLists.txt | ||
| Kconfig | ||