arch/arm/armv7-a: Modify to printing LR when NULL executing fault #6654
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The PR is from #6643. |
kishore-sn
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Jan 31, 2025
The elf_is_text_addr funtion returns whether the address which is argument is within the text section of an ELF binary registered by binfmt. Signed-off-by: eunwoo.nam <[email protected]>
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If null is executed, prefetch abort is occuring. But PC and R15 value is 0x00000000. For debugging this fault, we need to save LR(R14) and print it in fault log. Therefore, Add print LR in pretech abort logs. And if PC is not text address, replace system exception location to LR(R14). Signed-off-by: eunwoo.nam <[email protected]>
If PC becomes invalid causing a fault, we replace the system_exception_location with the address at LR. However, since the value of LR is the address to execute after returning, the actual address that caused the fault is the address -4. Therefore, when replacing LR with exception location, it is corrected to address - 4. This will help avoid confusion for developers working on debugging applications such as TRAP. Signed-off-by: eunwoo.nam <[email protected]>
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@kishore-sn @r-prabu @abhishek-samsung Could you review this? |
| if (g_bin_addr_list[bin_idx].text_addr != 0) { | ||
| start_addr = g_bin_addr_list[bin_idx].text_addr; | ||
| end_addr = start_addr + g_bin_addr_list[bin_idx].text_size; | ||
| if (start_addr < addr && addr < end_addr) { |
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similar function for elf checks <= . Please match it here too.
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