Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*---------------------------------------------------------------------------+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  |  get_address.c                                                            |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  |                                                                           |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  | Get the effective address from an FPU instruction.                        |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  |                                                                           |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  | Copyright (C) 1992,1993,1994,1997                                         |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  |                       Australia.  E-mail   billm@suburbia.net             |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  |                                                                           |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  |                                                                           |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  +---------------------------------------------------------------------------*/
^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)  | Note:                                                                     |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  |    The file contains code which accesses user memory.                     |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  |    Emulator static data may change when user memory is accessed, due to   |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  |    other processes using the emulator while swapping is in progress.      |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  +---------------------------------------------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <asm/vm86.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include "fpu_system.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include "exception.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include "fpu_emu.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define FPU_WRITE_BIT 0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static int reg_offset[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	offsetof(struct pt_regs, ax),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	offsetof(struct pt_regs, cx),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	offsetof(struct pt_regs, dx),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	offsetof(struct pt_regs, bx),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	offsetof(struct pt_regs, sp),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	offsetof(struct pt_regs, bp),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	offsetof(struct pt_regs, si),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	offsetof(struct pt_regs, di)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #define REG_(x) (*(long *)(reg_offset[(x)] + (u_char *)FPU_info->regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static int reg_offset_vm86[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	offsetof(struct pt_regs, cs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	offsetof(struct kernel_vm86_regs, ds),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	offsetof(struct kernel_vm86_regs, es),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	offsetof(struct kernel_vm86_regs, fs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	offsetof(struct kernel_vm86_regs, gs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	offsetof(struct pt_regs, ss),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	offsetof(struct kernel_vm86_regs, ds)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) #define VM86_REG_(x) (*(unsigned short *) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		(reg_offset_vm86[((unsigned)x)] + (u_char *)FPU_info->regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) static int reg_offset_pm[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	offsetof(struct pt_regs, cs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	offsetof(struct pt_regs, ds),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	offsetof(struct pt_regs, es),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	offsetof(struct pt_regs, fs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	offsetof(struct pt_regs, ds),	/* dummy, not saved on stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	offsetof(struct pt_regs, ss),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	offsetof(struct pt_regs, ds)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) #define PM_REG_(x) (*(unsigned short *) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		(reg_offset_pm[((unsigned)x)] + (u_char *)FPU_info->regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) /* Decode the SIB byte. This function assumes mod != 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) static int sib(int mod, unsigned long *fpu_eip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	u_char ss, index, base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	long offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	RE_ENTRANT_CHECK_OFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	FPU_code_access_ok(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	FPU_get_user(base, (u_char __user *) (*fpu_eip));	/* The SIB byte */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	RE_ENTRANT_CHECK_ON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	(*fpu_eip)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	ss = base >> 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	index = (base >> 3) & 7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	base &= 7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	if ((mod == 0) && (base == 5))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		offset = 0;	/* No base register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		offset = REG_(base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	if (index == 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		/* No index register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		/* A non-zero ss is illegal */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		if (ss)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			EXCEPTION(EX_Invalid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		offset += (REG_(index)) << ss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	if (mod == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		/* 8 bit signed displacement */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		long displacement;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		RE_ENTRANT_CHECK_OFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		FPU_code_access_ok(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		FPU_get_user(displacement, (signed char __user *)(*fpu_eip));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		offset += displacement;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		RE_ENTRANT_CHECK_ON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		(*fpu_eip)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	} else if (mod == 2 || base == 5) {	/* The second condition also has mod==0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		/* 32 bit displacement */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		long displacement;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		RE_ENTRANT_CHECK_OFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		FPU_code_access_ok(4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		FPU_get_user(displacement, (long __user *)(*fpu_eip));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		offset += displacement;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		RE_ENTRANT_CHECK_ON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		(*fpu_eip) += 4;
^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) 	return offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static unsigned long vm86_segment(u_char segment, struct address *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	segment--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) #ifdef PARANOID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	if (segment > PREFIX_SS_) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		EXCEPTION(EX_INTERNAL | 0x130);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		math_abort(FPU_info, SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) #endif /* PARANOID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	addr->selector = VM86_REG_(segment);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	return (unsigned long)VM86_REG_(segment) << 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /* This should work for 16 and 32 bit protected mode. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static long pm_address(u_char FPU_modrm, u_char segment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		       struct address *addr, long offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	struct desc_struct descriptor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	unsigned long base_address, limit, address, seg_top;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	segment--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) #ifdef PARANOID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	/* segment is unsigned, so this also detects if segment was 0: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	if (segment > PREFIX_SS_) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		EXCEPTION(EX_INTERNAL | 0x132);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		math_abort(FPU_info, SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) #endif /* PARANOID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	switch (segment) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	case PREFIX_GS_ - 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		/* user gs handling can be lazy, use special accessors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		addr->selector = get_user_gs(FPU_info->regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		addr->selector = PM_REG_(segment);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	descriptor = FPU_get_ldt_descriptor(addr->selector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	base_address = seg_get_base(&descriptor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	address = base_address + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	limit = seg_get_limit(&descriptor) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	limit *= seg_get_granularity(&descriptor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	limit += base_address - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	if (limit < base_address)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		limit = 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (seg_expands_down(&descriptor)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		if (descriptor.g) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			seg_top = 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			seg_top = base_address + (1 << 20);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			if (seg_top < base_address)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 				seg_top = 0xffffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		access_limit =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		    (address <= limit) || (address >= seg_top) ? 0 :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		    ((seg_top - address) >= 255 ? 255 : seg_top - address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		access_limit =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		    (address > limit) || (address < base_address) ? 0 :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		    ((limit - address) >= 254 ? 255 : limit - address + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	if (seg_execute_only(&descriptor) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	    (!seg_writable(&descriptor) && (FPU_modrm & FPU_WRITE_BIT))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		access_limit = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	return address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)        MOD R/M byte:  MOD == 3 has a special use for the FPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)                       SIB byte used iff R/M = 100b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)        7   6   5   4   3   2   1   0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)        .....   .........   .........
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)         MOD    OPCODE(2)     R/M
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)        SIB byte
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)        7   6   5   4   3   2   1   0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)        .....   .........   .........
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)         SS      INDEX        BASE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) void __user *FPU_get_address(u_char FPU_modrm, unsigned long *fpu_eip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 			     struct address *addr, fpu_addr_modes addr_modes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	u_char mod;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	unsigned rm = FPU_modrm & 7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	long *cpu_reg_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	int address = 0;	/* Initialized just to stop compiler warnings. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	/* Memory accessed via the cs selector is write protected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	   in `non-segmented' 32 bit protected mode. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (!addr_modes.default_mode && (FPU_modrm & FPU_WRITE_BIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	    && (addr_modes.override.segment == PREFIX_CS_)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		math_abort(FPU_info, SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	addr->selector = FPU_DS;	/* Default, for 32 bit non-segmented mode. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	mod = (FPU_modrm >> 6) & 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	if (rm == 4 && mod != 3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		address = sib(mod, fpu_eip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		cpu_reg_ptr = &REG_(rm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		switch (mod) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 			if (rm == 5) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 				/* Special case: disp32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 				RE_ENTRANT_CHECK_OFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 				FPU_code_access_ok(4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 				FPU_get_user(address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 					     (unsigned long __user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 					      *)(*fpu_eip));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 				(*fpu_eip) += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 				RE_ENTRANT_CHECK_ON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 				addr->offset = address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 				return (void __user *)address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 			} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 				address = *cpu_reg_ptr;	/* Just return the contents
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 							   of the cpu register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 				addr->offset = address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 				return (void __user *)address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 			/* 8 bit signed displacement */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 			RE_ENTRANT_CHECK_OFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 			FPU_code_access_ok(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 			FPU_get_user(address, (signed char __user *)(*fpu_eip));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 			RE_ENTRANT_CHECK_ON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			(*fpu_eip)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 			/* 32 bit displacement */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			RE_ENTRANT_CHECK_OFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			FPU_code_access_ok(4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 			FPU_get_user(address, (long __user *)(*fpu_eip));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 			(*fpu_eip) += 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 			RE_ENTRANT_CHECK_ON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		case 3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 			/* Not legal for the FPU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 			EXCEPTION(EX_Invalid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		address += *cpu_reg_ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	addr->offset = address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	switch (addr_modes.default_mode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	case VM86:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		address += vm86_segment(addr_modes.override.segment, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	case PM16:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	case SEG32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		address = pm_address(FPU_modrm, addr_modes.override.segment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 				     addr, address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		EXCEPTION(EX_INTERNAL | 0x133);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	return (void __user *)address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) void __user *FPU_get_address_16(u_char FPU_modrm, unsigned long *fpu_eip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 				struct address *addr, fpu_addr_modes addr_modes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	u_char mod;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	unsigned rm = FPU_modrm & 7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	int address = 0;	/* Default used for mod == 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	/* Memory accessed via the cs selector is write protected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	   in `non-segmented' 32 bit protected mode. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	if (!addr_modes.default_mode && (FPU_modrm & FPU_WRITE_BIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	    && (addr_modes.override.segment == PREFIX_CS_)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		math_abort(FPU_info, SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	addr->selector = FPU_DS;	/* Default, for 32 bit non-segmented mode. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	mod = (FPU_modrm >> 6) & 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	switch (mod) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		if (rm == 6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 			/* Special case: disp16 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 			RE_ENTRANT_CHECK_OFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 			FPU_code_access_ok(2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 			FPU_get_user(address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 				     (unsigned short __user *)(*fpu_eip));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 			(*fpu_eip) += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 			RE_ENTRANT_CHECK_ON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 			goto add_segment;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		/* 8 bit signed displacement */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		RE_ENTRANT_CHECK_OFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		FPU_code_access_ok(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		FPU_get_user(address, (signed char __user *)(*fpu_eip));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		RE_ENTRANT_CHECK_ON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 		(*fpu_eip)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		/* 16 bit displacement */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		RE_ENTRANT_CHECK_OFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		FPU_code_access_ok(2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		FPU_get_user(address, (unsigned short __user *)(*fpu_eip));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		(*fpu_eip) += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		RE_ENTRANT_CHECK_ON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	case 3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		/* Not legal for the FPU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		EXCEPTION(EX_Invalid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	switch (rm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		address += FPU_info->regs->bx + FPU_info->regs->si;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 		address += FPU_info->regs->bx + FPU_info->regs->di;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		address += FPU_info->regs->bp + FPU_info->regs->si;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 		if (addr_modes.override.segment == PREFIX_DEFAULT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 			addr_modes.override.segment = PREFIX_SS_;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	case 3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 		address += FPU_info->regs->bp + FPU_info->regs->di;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		if (addr_modes.override.segment == PREFIX_DEFAULT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 			addr_modes.override.segment = PREFIX_SS_;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	case 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 		address += FPU_info->regs->si;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	case 5:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		address += FPU_info->regs->di;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	case 6:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 		address += FPU_info->regs->bp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		if (addr_modes.override.segment == PREFIX_DEFAULT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 			addr_modes.override.segment = PREFIX_SS_;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	case 7:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 		address += FPU_info->regs->bx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)       add_segment:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	address &= 0xffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	addr->offset = address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	switch (addr_modes.default_mode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	case VM86:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 		address += vm86_segment(addr_modes.override.segment, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	case PM16:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	case SEG32:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 		address = pm_address(FPU_modrm, addr_modes.override.segment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 				     addr, address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 		EXCEPTION(EX_INTERNAL | 0x131);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	return (void __user *)address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) }