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| author | Tiezhu Yang <yangtiezhu@loongson.cn> | 2024-03-11 17:23:47 +0300 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2024-03-11 17:23:47 +0300 |
| commit | cb8a2ef0848ca80d67d6d56e2df757cfdf6b3355 (patch) | |
| tree | 937906ebbe09791a6b4963ade4cc655d78e7ee07 /arch/loongarch/mm/tlbex.S | |
| parent | e91c5e4c21b0339376ee124cda5c9b27d41f2cbc (diff) | |
| download | linux-cb8a2ef0848ca80d67d6d56e2df757cfdf6b3355.tar.xz | |
LoongArch: Add ORC stack unwinder support
The kernel CONFIG_UNWINDER_ORC option enables the ORC unwinder, which is
similar in concept to a DWARF unwinder. The difference is that the format
of the ORC data is much simpler than DWARF, which in turn allows the ORC
unwinder to be much simpler and faster.
The ORC data consists of unwind tables which are generated by objtool.
After analyzing all the code paths of a .o file, it determines information
about the stack state at each instruction address in the file and outputs
that information to the .orc_unwind and .orc_unwind_ip sections.
The per-object ORC sections are combined at link time and are sorted and
post-processed at boot time. The unwinder uses the resulting data to
correlate instruction addresses with their stack states at run time.
Most of the logic are similar with x86, in order to get ra info before ra
is saved into stack, add ra_reg and ra_offset into orc_entry. At the same
time, modify some arch-specific code to silence the objtool warnings.
Co-developed-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Co-developed-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/mm/tlbex.S')
| -rw-r--r-- | arch/loongarch/mm/tlbex.S | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/loongarch/mm/tlbex.S b/arch/loongarch/mm/tlbex.S index d5d682f3d29f..a44387b838af 100644 --- a/arch/loongarch/mm/tlbex.S +++ b/arch/loongarch/mm/tlbex.S @@ -18,6 +18,7 @@ .macro tlb_do_page_fault, write SYM_CODE_START(tlb_do_page_fault_\write) + UNWIND_HINT_UNDEFINED SAVE_ALL csrrd a2, LOONGARCH_CSR_BADV move a0, sp @@ -32,6 +33,7 @@ tlb_do_page_fault 1 SYM_CODE_START(handle_tlb_protect) + UNWIND_HINT_UNDEFINED BACKUP_T0T1 SAVE_ALL move a0, sp @@ -44,6 +46,7 @@ SYM_CODE_START(handle_tlb_protect) SYM_CODE_END(handle_tlb_protect) SYM_CODE_START(handle_tlb_load) + UNWIND_HINT_UNDEFINED csrwr t0, EXCEPTION_KS0 csrwr t1, EXCEPTION_KS1 csrwr ra, EXCEPTION_KS2 @@ -190,6 +193,7 @@ nopage_tlb_load: SYM_CODE_END(handle_tlb_load) SYM_CODE_START(handle_tlb_load_ptw) + UNWIND_HINT_UNDEFINED csrwr t0, LOONGARCH_CSR_KS0 csrwr t1, LOONGARCH_CSR_KS1 la_abs t0, tlb_do_page_fault_0 @@ -197,6 +201,7 @@ SYM_CODE_START(handle_tlb_load_ptw) SYM_CODE_END(handle_tlb_load_ptw) SYM_CODE_START(handle_tlb_store) + UNWIND_HINT_UNDEFINED csrwr t0, EXCEPTION_KS0 csrwr t1, EXCEPTION_KS1 csrwr ra, EXCEPTION_KS2 @@ -346,6 +351,7 @@ nopage_tlb_store: SYM_CODE_END(handle_tlb_store) SYM_CODE_START(handle_tlb_store_ptw) + UNWIND_HINT_UNDEFINED csrwr t0, LOONGARCH_CSR_KS0 csrwr t1, LOONGARCH_CSR_KS1 la_abs t0, tlb_do_page_fault_1 @@ -353,6 +359,7 @@ SYM_CODE_START(handle_tlb_store_ptw) SYM_CODE_END(handle_tlb_store_ptw) SYM_CODE_START(handle_tlb_modify) + UNWIND_HINT_UNDEFINED csrwr t0, EXCEPTION_KS0 csrwr t1, EXCEPTION_KS1 csrwr ra, EXCEPTION_KS2 @@ -500,6 +507,7 @@ nopage_tlb_modify: SYM_CODE_END(handle_tlb_modify) SYM_CODE_START(handle_tlb_modify_ptw) + UNWIND_HINT_UNDEFINED csrwr t0, LOONGARCH_CSR_KS0 csrwr t1, LOONGARCH_CSR_KS1 la_abs t0, tlb_do_page_fault_1 @@ -507,6 +515,7 @@ SYM_CODE_START(handle_tlb_modify_ptw) SYM_CODE_END(handle_tlb_modify_ptw) SYM_CODE_START(handle_tlb_refill) + UNWIND_HINT_UNDEFINED csrwr t0, LOONGARCH_CSR_TLBRSAVE csrrd t0, LOONGARCH_CSR_PGD lddir t0, t0, 3 |