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cb8a2ef084
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>
101 lines
2.1 KiB
ArmAsm
101 lines
2.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*
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* Derived from MIPS:
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* Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Copyright (C) 2001 MIPS Technologies, Inc.
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*/
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#include <asm/asm.h>
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#include <asm/asmmacro.h>
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#include <asm/loongarch.h>
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#include <asm/regdef.h>
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#include <asm/stackframe.h>
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#include <asm/thread_info.h>
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#include <asm/unwind_hints.h>
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.text
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.cfi_sections .debug_frame
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.align 5
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SYM_CODE_START(handle_syscall)
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UNWIND_HINT_UNDEFINED
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csrrd t0, PERCPU_BASE_KS
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la.pcrel t1, kernelsp
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add.d t1, t1, t0
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move t2, sp
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ld.d sp, t1, 0
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addi.d sp, sp, -PT_SIZE
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cfi_st t2, PT_R3
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cfi_rel_offset sp, PT_R3
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st.d zero, sp, PT_R0
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csrrd t2, LOONGARCH_CSR_PRMD
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st.d t2, sp, PT_PRMD
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csrrd t2, LOONGARCH_CSR_CRMD
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st.d t2, sp, PT_CRMD
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csrrd t2, LOONGARCH_CSR_EUEN
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st.d t2, sp, PT_EUEN
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csrrd t2, LOONGARCH_CSR_ECFG
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st.d t2, sp, PT_ECFG
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csrrd t2, LOONGARCH_CSR_ESTAT
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st.d t2, sp, PT_ESTAT
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cfi_st ra, PT_R1
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cfi_st a0, PT_R4
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cfi_st a1, PT_R5
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cfi_st a2, PT_R6
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cfi_st a3, PT_R7
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cfi_st a4, PT_R8
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cfi_st a5, PT_R9
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cfi_st a6, PT_R10
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cfi_st a7, PT_R11
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csrrd ra, LOONGARCH_CSR_ERA
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st.d ra, sp, PT_ERA
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cfi_rel_offset ra, PT_ERA
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cfi_st tp, PT_R2
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cfi_st u0, PT_R21
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cfi_st fp, PT_R22
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SAVE_STATIC
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UNWIND_HINT_REGS
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#ifdef CONFIG_KGDB
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li.w t1, CSR_CRMD_WE
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csrxchg t1, t1, LOONGARCH_CSR_CRMD
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#endif
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move u0, t0
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li.d tp, ~_THREAD_MASK
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and tp, tp, sp
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move a0, sp
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bl do_syscall
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RESTORE_ALL_AND_RET
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SYM_CODE_END(handle_syscall)
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_ASM_NOKPROBE(handle_syscall)
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SYM_CODE_START(ret_from_fork)
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UNWIND_HINT_REGS
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bl schedule_tail # a0 = struct task_struct *prev
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move a0, sp
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bl syscall_exit_to_user_mode
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RESTORE_STATIC
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RESTORE_SOME
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RESTORE_SP_AND_RET
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SYM_CODE_END(ret_from_fork)
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SYM_CODE_START(ret_from_kernel_thread)
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UNWIND_HINT_REGS
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bl schedule_tail # a0 = struct task_struct *prev
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move a0, s1
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jirl ra, s0, 0
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move a0, sp
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bl syscall_exit_to_user_mode
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RESTORE_STATIC
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RESTORE_SOME
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RESTORE_SP_AND_RET
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SYM_CODE_END(ret_from_kernel_thread)
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