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riscv: Fixes GDB backtrace of interrupted threads

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Save missed SP value on stack
This commit is contained in:
Alexey Gerenkov 2022-01-27 00:39:52 +03:00
parent 80ea94dd36
commit 44bfddd784
1 changed files with 11 additions and 0 deletions
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11
components/riscv/vectors.S
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@ -223,6 +223,17 @@ _interrupt_handler:
save_regs
save_mepc
/* Though it is not necessary we save GP and SP here.
* SP is necessary to help GDB to properly unwind
* the backtrace of threads preempted by interrupts (OS tick etc.).
* GP is saved just to have its proper value in GDB. */
/* As gp register is not saved by the macro, save it here */
sw gp, RV_STK_GP(sp)
/* Same goes for the SP value before trapping */
addi t0, sp, CONTEXT_SIZE /* restore sp with the value when interrupt happened */
/* Save SP */
sw t0, RV_STK_SP(sp)
/* Before doing anythig preserve the stack pointer */
/* It will be saved in current TCB, if needed */
mv a0, sp