lwn.git/arch/parisc/kernel/unwind.c, branch v5.17-rc2

parisc: Move thread_info into task struct

2021-11-01T06:35:59+00:00

This implements the CONFIG_THREAD_INFO_IN_TASK option. With this change: - before thread_info was part of the stack and located at the beginning of the stack - now the thread_info struct is moved and located inside the task_struct structure - the stack is allocated and handled like the major other platforms - drop the cpu field of thread_info and use instead the one in task_struct Signed-off-by: Helge Deller Signed-off-by: Sven Schnelle

parisc/unwind: fix unwinder when CONFIG_64BIT is enabled

2021-11-01T06:35:58+00:00

With 64 bit kernels unwind_special() is not working because it compares the pc to the address of the function descriptor. Add a helper function that compares pc with the dereferenced address. This fixes all of the backtraces on my c8000. Without this changes, a lot of backtraces are missing in kdb or the show-all-tasks command from /proc/sysrq-trigger. Signed-off-by: Sven Schnelle Signed-off-by: Helge Deller

parisc/unwind: use copy_from_kernel_nofault()

2021-10-30T21:11:00+00:00

I have no idea why get_user() is used there, but we're unwinding the kernel stack, so we should use copy_from_kernel_nofault(). Signed-off-by: Sven Schnelle Signed-off-by: Helge Deller

parisc: Use __ro_after_init in unwind.c

2019-05-10T19:00:45+00:00

Signed-off-by: Helge Deller

parisc: Fix uninitialized variable usage in unwind.c

2018-10-16T09:37:29+00:00

As noticed by Dave Anglin, the last commit introduced a small bug where the potentially uninitialized r struct is used instead of the regs pointer as input for unwind_frame_init(). Fix it. Signed-off-by: Helge Deller Reported-by: John David Anglin

parisc: Fix boot failure of 64-bit kernel

2018-08-21T12:32:44+00:00

Commit c8921d72e390 ("parisc: Fix and improve kernel stack unwinding") broke booting of 64-bit kernels. On 64-bit kernels function pointers are actually function descriptors which require dereferencing. In this patch we instead declare functions in assembly code which are referenced from C-code as external data pointers with the ENTRY() macro and thus can use a simple external reference to the functions. Signed-off-by: Helge Deller Fixes: c8921d72e390 ("parisc: Fix and improve kernel stack unwinding")

parisc: Consolidate unwind initialization calls

2018-08-17T15:00:08+00:00

Signed-off-by: Helge Deller

parisc: Fix and improve kernel stack unwinding

2018-08-13T07:54:17+00:00

This patchset fixes and improves stack unwinding a lot: 1. Show backward stack traces with up to 30 callsites 2. Add callinfo to ENTRY_CFI() such that every assembler function will get an entry in the unwind table 3. Use constants instead of numbers in call_on_stack() 4. Do not depend on CONFIG_KALLSYMS to generate backtraces. 5. Speed up backtrace generation Make sure you have this patch to GNU as installed: https://sourceware.org/ml/binutils/2018-07/msg00474.html Without this patch, unwind info in the kernel is often wrong for various functions. Signed-off-by: Helge Deller

parisc: prefer _THIS_IP_ and _RET_IP_ statement expressions

2018-08-13T07:30:59+00:00

As part of the effort to reduce the code duplication between _THIS_IP_ and current_text_addr(), let's consolidate callers of current_text_addr() to use _THIS_IP_. Signed-off-by: Nick Desaulniers Signed-off-by: Helge Deller

parisc: Reduce debug output in unwind code

2018-06-28T20:54:17+00:00

Signed-off-by: Helge Deller