Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * OpenRISC ptrace.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Linux architectural port borrowing liberally from similar works of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * others.  All original copyrights apply as per the original source
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * declaration.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Modifications for the OpenRISC architecture:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * Copyright (C) 2005 Gyorgy Jeney <nog@bsemi.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/audit.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/regset.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/tracehook.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/elf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <asm/thread_info.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  * Copy the thread state to a regset that can be interpreted by userspace.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  * It doesn't matter what our internal pt_regs structure looks like.  The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  * important thing is that we export a consistent view of the thread state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  * to userspace.  As such, we need to make sure that the regset remains
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  * ABI compatible as defined by the struct user_regs_struct:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  * (Each item is a 32-bit word)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  * r0 = 0 (exported for clarity)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  * 31 GPRS r1-r31
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * PC (Program counter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  * SR (Supervision register)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static int genregs_get(struct task_struct *target,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		       const struct user_regset *regset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		       struct membuf to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	const struct pt_regs *regs = task_pt_regs(target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	/* r0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	membuf_zero(&to, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	membuf_write(&to, regs->gpr + 1, 31 * 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	membuf_store(&to, regs->pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	return membuf_store(&to, regs->sr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  * Set the thread state from a regset passed in via ptrace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static int genregs_set(struct task_struct *target,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		       const struct user_regset *regset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		       unsigned int pos, unsigned int count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		       const void *kbuf, const void __user * ubuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	struct pt_regs *regs = task_pt_regs(target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	/* ignore r0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	/* r1 - r31 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 					 regs->gpr+1, 4, 4*32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	/* PC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 				 &regs->pc, 4*32, 4*33);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	 * Skip SR and padding... userspace isn't allowed to changes bits in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	 * the Supervision register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 						4*33, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91)  * Define the register sets available on OpenRISC under Linux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) enum or1k_regset {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	REGSET_GENERAL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) static const struct user_regset or1k_regsets[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	[REGSET_GENERAL] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 			    .core_note_type = NT_PRSTATUS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			    .n = ELF_NGREG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 			    .size = sizeof(long),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 			    .align = sizeof(long),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 			    .regset_get = genregs_get,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			    .set = genregs_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			    },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static const struct user_regset_view user_or1k_native_view = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	.name = "or1k",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	.e_machine = EM_OPENRISC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	.regsets = or1k_regsets,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	.n = ARRAY_SIZE(or1k_regsets),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) const struct user_regset_view *task_user_regset_view(struct task_struct *task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	return &user_or1k_native_view;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)  * does not yet catch signals sent when the child dies.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)  * in exit.c or in signal.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)  * Called by kernel/ptrace.c when detaching..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)  * Make sure the single step bit is not set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) void ptrace_disable(struct task_struct *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	pr_debug("ptrace_disable(): TODO\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	user_disable_single_step(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		 unsigned long data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	switch (request) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		ret = ptrace_request(child, request, addr, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)  * Notification of system call entry/exit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)  * - triggered by current->work.syscall_trace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	long ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	    tracehook_report_syscall_entry(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		 * Tracing decided this syscall should not happen.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		 * We'll return a bogus call number to get an ENOSYS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		 * error, but leave the original number in <something>.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		ret = -1L;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	audit_syscall_entry(regs->gpr[11], regs->gpr[3], regs->gpr[4],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 			    regs->gpr[5], regs->gpr[6]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	return ret ? : regs->gpr[11];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	int step;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	audit_syscall_exit(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	step = test_thread_flag(TIF_SINGLESTEP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	if (step || test_thread_flag(TIF_SYSCALL_TRACE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		tracehook_report_syscall_exit(regs, step);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }