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        "code": "\n__visible void ret_from_fork(struct task_struct *prev, struct pt_regs *regs,\n\t\t\t\t     int (*fn)(void *), void *fn_arg)\n{\n\tschedule_tail(prev);\n\n\t/* Is this a kernel thread? */\n\tif (unlikely(fn)) {\n\t\tfn(fn_arg);\n\t\t/*\n\t\t * A kernel thread is allowed to return here after successfully\n\t\t * calling kernel_execve().  Exit to userspace to complete the\n\t\t * execve() syscall.\n\t\t */\n\t\tregs->ax = 0;\n\t}\n\n\tsyscall_exit_to_user_mode(regs);\n}\n"
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    {
      "index": 5,
      "function": "ret_from_fork_asm",
      "module": "vmlinux",
      "address_computed": "0xffffffff812d8dca",
      "address_formatted": "0xffffffff812d8dca (0xffffffff812d8db0 + 0x1a)",
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      "addr2line_address": "0xffffffff812d8dc9",
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          "file": "arch/x86/entry/entry_64.S",
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        "start_line": 205,
        "end_line": 305,
        "code": "\t */\n\tFILL_RETURN_BUFFER %r12, RSB_CLEAR_LOOPS, X86_FEATURE_RSB_CTXSW\n\n\t/* restore callee-saved registers */\n\tpopq\t%r15\n\tpopq\t%r14\n\tpopq\t%r13\n\tpopq\t%r12\n\tpopq\t%rbx\n\tpopq\t%rbp\n\n\tjmp\t__switch_to\nSYM_FUNC_END(__switch_to_asm)\n.popsection\n\n/*\n * A newly forked process directly context switches into this address.\n *\n * rax: prev task we switched from\n * rbx: kernel thread func (NULL for user thread)\n * r12: kernel thread arg\n */\n.pushsection .text, \"ax\"\nSYM_CODE_START(ret_from_fork_asm)\n\t/*\n\t * This is the start of the kernel stack; even through there's a\n\t * register set at the top, the regset isn't necessarily coherent\n\t * (consider kthreads) and one cannot unwind further.\n\t *\n\t * This ensures stack unwinds of kernel threads terminate in a known\n\t * good state.\n\t */\n\tUNWIND_HINT_END_OF_STACK\n\tANNOTATE_NOENDBR // copy_thread\n\tCALL_DEPTH_ACCOUNT\n\n\tmovq\t%rax, %rdi\t\t/* prev */\n\tmovq\t%rsp, %rsi\t\t/* regs */\n\tmovq\t%rbx, %rdx\t\t/* fn */\n\tmovq\t%r12, %rcx\t\t/* fn_arg */\n\tcall\tret_from_fork\n\n\t/*\n\t * Set the stack state to what is expected for the target function\n\t * -- at this point the register set should be a valid user set\n\t * and unwind should work normally.\n\t */\n\tUNWIND_HINT_REGS\n\n#ifdef CONFIG_X86_FRED\n\tALTERNATIVE \"jmp swapgs_restore_regs_and_return_to_usermode\", \\\n\t\t    \"jmp asm_fred_exit_user\", X86_FEATURE_FRED\n#else\n\tjmp\tswapgs_restore_regs_and_return_to_usermode\n#endif\nSYM_CODE_END(ret_from_fork_asm)\n.popsection\n\n.macro DEBUG_ENTRY_ASSERT_IRQS_OFF\n#ifdef CONFIG_DEBUG_ENTRY\n\tpushq %rax\n\tSAVE_FLAGS\n\ttestl $X86_EFLAGS_IF, %eax\n\tjz .Lokay_\\@\n\tud2\n.Lokay_\\@:\n\tpopq %rax\n#endif\n.endm\n\nSYM_CODE_START(xen_error_entry)\n\tANNOTATE_NOENDBR\n\tUNWIND_HINT_FUNC\n\tPUSH_AND_CLEAR_REGS save_ret=1\n\tENCODE_FRAME_POINTER 8\n\tUNTRAIN_RET_FROM_CALL\n\tRET\nSYM_CODE_END(xen_error_entry)\n\n/**\n * idtentry_body - Macro to emit code calling the C function\n * @cfunc:\t\tC function to be called\n * @has_error_code:\tHardware pushed error code on stack\n */\n.macro idtentry_body cfunc has_error_code:req\n\n\t/*\n\t * Call error_entry() and switch to the task stack if from userspace.\n\t *\n\t * When in XENPV, it is already in the task stack, and it can't fault\n\t * for native_iret() nor native_load_gs_index() since XENPV uses its\n\t * own pvops for IRET and load_gs_index().  And it doesn't need to\n\t * switch the CR3.  So it can skip invoking error_entry().\n\t */\n\tALTERNATIVE \"call error_entry; movq %rax, %rsp\", \\\n\t\t    \"call xen_error_entry\", X86_FEATURE_XENPV\n\n\tENCODE_FRAME_POINTER\n\tUNWIND_HINT_REGS\n\n\tmovq\t%rsp, %rdi\t\t\t/* pt_regs pointer into 1st argument*/\n"
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}