Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Licensed under the GPL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <asm/ptrace-abi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <skas.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) extern int arch_switch_tls(struct task_struct *to);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) void arch_switch_to(struct task_struct *to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	int err = arch_switch_tls(to);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	if (err != -EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 		printk(KERN_WARNING "arch_switch_tls failed, errno %d, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 		       "not EINVAL\n", -err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 		printk(KERN_WARNING "arch_switch_tls failed, errno = EINVAL\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) int is_syscall(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	unsigned short instr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	if (n) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 		/* access_process_vm() grants access to vsyscall and stub,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 		 * while copy_from_user doesn't. Maybe access_process_vm is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		 * slow, but that doesn't matter, since it will be called only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		 * in case of singlestepping, if copy_from_user failed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		n = access_process_vm(current, addr, &instr, sizeof(instr),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 				FOLL_FORCE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		if (n != sizeof(instr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 			printk(KERN_ERR "is_syscall : failed to read "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 			       "instruction from 0x%lx\n", addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 			return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	/* int 0x80 or sysenter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	return (instr == 0x80cd) || (instr == 0x340f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) /* determines which flags the user has access to. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) /* 1 = access 0 = no access */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) #define FLAG_MASK 0x00044dd5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) static const int reg_offsets[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	[EBX] = HOST_BX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	[ECX] = HOST_CX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	[EDX] = HOST_DX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	[ESI] = HOST_SI,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	[EDI] = HOST_DI,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	[EBP] = HOST_BP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	[EAX] = HOST_AX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	[DS] = HOST_DS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	[ES] = HOST_ES,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	[FS] = HOST_FS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	[GS] = HOST_GS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	[EIP] = HOST_IP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	[CS] = HOST_CS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	[EFL] = HOST_EFLAGS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	[UESP] = HOST_SP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	[SS] = HOST_SS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	[ORIG_EAX] = HOST_ORIG_AX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) int putreg(struct task_struct *child, int regno, unsigned long value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	regno >>= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	switch (regno) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	case EBX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	case ECX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	case EDX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	case ESI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	case EDI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	case EBP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	case EAX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	case EIP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	case UESP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	case ORIG_EAX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		/* Update the syscall number. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		UPT_SYSCALL_NR(&child->thread.regs.regs) = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	case FS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		if (value && (value & 3) != 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	case GS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		if (value && (value & 3) != 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 			return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	case DS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	case ES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		if (value && (value & 3) != 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		value &= 0xffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	case SS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	case CS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		if ((value & 3) != 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 			return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		value &= 0xffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	case EFL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		value &= FLAG_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		child->thread.regs.regs.gp[HOST_EFLAGS] |= value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	default :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		panic("Bad register in putreg() : %d\n", regno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	child->thread.regs.regs.gp[reg_offsets[regno]] = value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) int poke_user(struct task_struct *child, long addr, long data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	if ((addr & 3) || addr < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	if (addr < MAX_REG_OFFSET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		return putreg(child, addr, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		 (addr <= offsetof(struct user, u_debugreg[7]))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		addr -= offsetof(struct user, u_debugreg[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		addr = addr >> 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		if ((addr == 4) || (addr == 5))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		child->thread.arch.debugregs[addr] = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) unsigned long getreg(struct task_struct *child, int regno)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	unsigned long mask = ~0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	regno >>= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	switch (regno) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	case FS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	case GS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	case DS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	case ES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	case SS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	case CS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		mask = 0xffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	case EIP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	case UESP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	case EAX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	case EBX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	case ECX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	case EDX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	case ESI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	case EDI:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	case EBP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	case EFL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	case ORIG_EAX:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		panic("Bad register in getreg() : %d\n", regno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	return mask & child->thread.regs.regs.gp[reg_offsets[regno]];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* read the word at location addr in the USER area. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) int peek_user(struct task_struct *child, long addr, long data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	unsigned long tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	if ((addr & 3) || addr < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	tmp = 0;  /* Default return condition */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	if (addr < MAX_REG_OFFSET) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		tmp = getreg(child, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		 (addr <= offsetof(struct user, u_debugreg[7]))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		addr -= offsetof(struct user, u_debugreg[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		addr = addr >> 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		tmp = child->thread.arch.debugregs[addr];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	return put_user(tmp, (unsigned long __user *) data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	int err, n, cpu = task_cpu(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	struct user_i387_struct fpregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	err = save_i387_registers(userspace_pid[cpu],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 				  (unsigned long *) &fpregs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	n = copy_to_user(buf, &fpregs, sizeof(fpregs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	if(n > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	int n, cpu = task_cpu(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	struct user_i387_struct fpregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	n = copy_from_user(&fpregs, buf, sizeof(fpregs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	if (n > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	return restore_i387_registers(userspace_pid[cpu],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 				    (unsigned long *) &fpregs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) static int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	int err, n, cpu = task_cpu(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	struct user_fxsr_struct fpregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	err = save_fpx_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	n = copy_to_user(buf, &fpregs, sizeof(fpregs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	if(n > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	int n, cpu = task_cpu(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	struct user_fxsr_struct fpregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	n = copy_from_user(&fpregs, buf, sizeof(fpregs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	if (n > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	return restore_fpx_registers(userspace_pid[cpu],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 				     (unsigned long *) &fpregs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) long subarch_ptrace(struct task_struct *child, long request,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		    unsigned long addr, unsigned long data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	int ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	void __user *datap = (void __user *) data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	switch (request) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	case PTRACE_GETFPREGS: /* Get the child FPU state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		ret = get_fpregs(datap, child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	case PTRACE_SETFPREGS: /* Set the child FPU state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		ret = set_fpregs(datap, child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	case PTRACE_GETFPXREGS: /* Get the child FPU state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		ret = get_fpxregs(datap, child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	case PTRACE_SETFPXREGS: /* Set the child FPU state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		ret = set_fpxregs(datap, child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }