diff options
Diffstat (limited to 'arch/unicore32/mm/alignment.c')
| -rw-r--r-- | arch/unicore32/mm/alignment.c | 524 |
1 files changed, 0 insertions, 524 deletions
diff --git a/arch/unicore32/mm/alignment.c b/arch/unicore32/mm/alignment.c deleted file mode 100644 index 2ea98f7a4156..000000000000 --- a/arch/unicore32/mm/alignment.c +++ /dev/null @@ -1,524 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * linux/arch/unicore32/mm/alignment.c - * - * Code specific to PKUnity SoC and UniCore ISA - * - * Copyright (C) 2001-2010 GUAN Xue-tao - */ -/* - * TODO: - * FPU ldm/stm not handling - */ -#include <linux/compiler.h> -#include <linux/kernel.h> -#include <linux/sched/debug.h> -#include <linux/errno.h> -#include <linux/string.h> -#include <linux/init.h> -#include <linux/sched.h> -#include <linux/uaccess.h> -#include <linux/pgtable.h> - -#include <asm/tlbflush.h> -#include <asm/unaligned.h> - -#include "mm.h" - -#define CODING_BITS(i) (i & 0xe0000120) - -#define LDST_P_BIT(i) (i & (1 << 28)) /* Preindex */ -#define LDST_U_BIT(i) (i & (1 << 27)) /* Add offset */ -#define LDST_W_BIT(i) (i & (1 << 25)) /* Writeback */ -#define LDST_L_BIT(i) (i & (1 << 24)) /* Load */ - -#define LDST_P_EQ_U(i) ((((i) ^ ((i) >> 1)) & (1 << 27)) == 0) - -#define LDSTH_I_BIT(i) (i & (1 << 26)) /* half-word immed */ -#define LDM_S_BIT(i) (i & (1 << 26)) /* write ASR from BSR */ -#define LDM_H_BIT(i) (i & (1 << 6)) /* select r0-r15 or r16-r31 */ - -#define RN_BITS(i) ((i >> 19) & 31) /* Rn */ -#define RD_BITS(i) ((i >> 14) & 31) /* Rd */ -#define RM_BITS(i) (i & 31) /* Rm */ - -#define REGMASK_BITS(i) (((i & 0x7fe00) >> 3) | (i & 0x3f)) -#define OFFSET_BITS(i) (i & 0x03fff) - -#define SHIFT_BITS(i) ((i >> 9) & 0x1f) -#define SHIFT_TYPE(i) (i & 0xc0) -#define SHIFT_LSL 0x00 -#define SHIFT_LSR 0x40 -#define SHIFT_ASR 0x80 -#define SHIFT_RORRRX 0xc0 - -union offset_union { - unsigned long un; - signed long sn; -}; - -#define TYPE_ERROR 0 -#define TYPE_FAULT 1 -#define TYPE_LDST 2 -#define TYPE_DONE 3 -#define TYPE_SWAP 4 -#define TYPE_COLS 5 /* Coprocessor load/store */ - -#define get8_unaligned_check(val, addr, err) \ - __asm__( \ - "1: ldb.u %1, [%2], #1\n" \ - "2:\n" \ - " .pushsection .fixup,\"ax\"\n" \ - " .align 2\n" \ - "3: mov %0, #1\n" \ - " b 2b\n" \ - " .popsection\n" \ - " .pushsection __ex_table,\"a\"\n" \ - " .align 3\n" \ - " .long 1b, 3b\n" \ - " .popsection\n" \ - : "=r" (err), "=&r" (val), "=r" (addr) \ - : "0" (err), "2" (addr)) - -#define get8t_unaligned_check(val, addr, err) \ - __asm__( \ - "1: ldb.u %1, [%2], #1\n" \ - "2:\n" \ - " .pushsection .fixup,\"ax\"\n" \ - " .align 2\n" \ - "3: mov %0, #1\n" \ - " b 2b\n" \ - " .popsection\n" \ - " .pushsection __ex_table,\"a\"\n" \ - " .align 3\n" \ - " .long 1b, 3b\n" \ - " .popsection\n" \ - : "=r" (err), "=&r" (val), "=r" (addr) \ - : "0" (err), "2" (addr)) - -#define get16_unaligned_check(val, addr) \ - do { \ - unsigned int err = 0, v, a = addr; \ - get8_unaligned_check(val, a, err); \ - get8_unaligned_check(v, a, err); \ - val |= v << 8; \ - if (err) \ - goto fault; \ - } while (0) - -#define put16_unaligned_check(val, addr) \ - do { \ - unsigned int err = 0, v = val, a = addr; \ - __asm__( \ - "1: stb.u %1, [%2], #1\n" \ - " mov %1, %1 >> #8\n" \ - "2: stb.u %1, [%2]\n" \ - "3:\n" \ - " .pushsection .fixup,\"ax\"\n" \ - " .align 2\n" \ - "4: mov %0, #1\n" \ - " b 3b\n" \ - " .popsection\n" \ - " .pushsection __ex_table,\"a\"\n" \ - " .align 3\n" \ - " .long 1b, 4b\n" \ - " .long 2b, 4b\n" \ - " .popsection\n" \ - : "=r" (err), "=&r" (v), "=&r" (a) \ - : "0" (err), "1" (v), "2" (a)); \ - if (err) \ - goto fault; \ - } while (0) - -#define __put32_unaligned_check(ins, val, addr) \ - do { \ - unsigned int err = 0, v = val, a = addr; \ - __asm__( \ - "1: "ins" %1, [%2], #1\n" \ - " mov %1, %1 >> #8\n" \ - "2: "ins" %1, [%2], #1\n" \ - " mov %1, %1 >> #8\n" \ - "3: "ins" %1, [%2], #1\n" \ - " mov %1, %1 >> #8\n" \ - "4: "ins" %1, [%2]\n" \ - "5:\n" \ - " .pushsection .fixup,\"ax\"\n" \ - " .align 2\n" \ - "6: mov %0, #1\n" \ - " b 5b\n" \ - " .popsection\n" \ - " .pushsection __ex_table,\"a\"\n" \ - " .align 3\n" \ - " .long 1b, 6b\n" \ - " .long 2b, 6b\n" \ - " .long 3b, 6b\n" \ - " .long 4b, 6b\n" \ - " .popsection\n" \ - : "=r" (err), "=&r" (v), "=&r" (a) \ - : "0" (err), "1" (v), "2" (a)); \ - if (err) \ - goto fault; \ - } while (0) - -#define get32_unaligned_check(val, addr) \ - do { \ - unsigned int err = 0, v, a = addr; \ - get8_unaligned_check(val, a, err); \ - get8_unaligned_check(v, a, err); \ - val |= v << 8; \ - get8_unaligned_check(v, a, err); \ - val |= v << 16; \ - get8_unaligned_check(v, a, err); \ - val |= v << 24; \ - if (err) \ - goto fault; \ - } while (0) - -#define put32_unaligned_check(val, addr) \ - __put32_unaligned_check("stb.u", val, addr) - -#define get32t_unaligned_check(val, addr) \ - do { \ - unsigned int err = 0, v, a = addr; \ - get8t_unaligned_check(val, a, err); \ - get8t_unaligned_check(v, a, err); \ - val |= v << 8; \ - get8t_unaligned_check(v, a, err); \ - val |= v << 16; \ - get8t_unaligned_check(v, a, err); \ - val |= v << 24; \ - if (err) \ - goto fault; \ - } while (0) - -#define put32t_unaligned_check(val, addr) \ - __put32_unaligned_check("stb.u", val, addr) - -static void -do_alignment_finish_ldst(unsigned long addr, unsigned long instr, - struct pt_regs *regs, union offset_union offset) -{ - if (!LDST_U_BIT(instr)) - offset.un = -offset.un; - - if (!LDST_P_BIT(instr)) - addr += offset.un; - - if (!LDST_P_BIT(instr) || LDST_W_BIT(instr)) - regs->uregs[RN_BITS(instr)] = addr; -} - -static int -do_alignment_ldrhstrh(unsigned long addr, unsigned long instr, - struct pt_regs *regs) -{ - unsigned int rd = RD_BITS(instr); - - /* old value 0x40002120, can't judge swap instr correctly */ - if ((instr & 0x4b003fe0) == 0x40000120) - goto swp; - - if (LDST_L_BIT(instr)) { - unsigned long val; - get16_unaligned_check(val, addr); - - /* signed half-word? */ - if (instr & 0x80) - val = (signed long)((signed short)val); - - regs->uregs[rd] = val; - } else - put16_unaligned_check(regs->uregs[rd], addr); - - return TYPE_LDST; - -swp: - /* only handle swap word - * for swap byte should not active this alignment exception */ - get32_unaligned_check(regs->uregs[RD_BITS(instr)], addr); - put32_unaligned_check(regs->uregs[RM_BITS(instr)], addr); - return TYPE_SWAP; - -fault: - return TYPE_FAULT; -} - -static int -do_alignment_ldrstr(unsigned long addr, unsigned long instr, - struct pt_regs *regs) -{ - unsigned int rd = RD_BITS(instr); - - if (!LDST_P_BIT(instr) && LDST_W_BIT(instr)) - goto trans; - - if (LDST_L_BIT(instr)) - get32_unaligned_check(regs->uregs[rd], addr); - else - put32_unaligned_check(regs->uregs[rd], addr); - return TYPE_LDST; - -trans: - if (LDST_L_BIT(instr)) - get32t_unaligned_check(regs->uregs[rd], addr); - else - put32t_unaligned_check(regs->uregs[rd], addr); - return TYPE_LDST; - -fault: - return TYPE_FAULT; -} - -/* - * LDM/STM alignment handler. - * - * There are 4 variants of this instruction: - * - * B = rn pointer before instruction, A = rn pointer after instruction - * ------ increasing address -----> - * | | r0 | r1 | ... | rx | | - * PU = 01 B A - * PU = 11 B A - * PU = 00 A B - * PU = 10 A B - */ -static int -do_alignment_ldmstm(unsigned long addr, unsigned long instr, - struct pt_regs *regs) -{ - unsigned int rd, rn, pc_correction, reg_correction, nr_regs, regbits; - unsigned long eaddr, newaddr; - - if (LDM_S_BIT(instr)) - goto bad; - - pc_correction = 4; /* processor implementation defined */ - - /* count the number of registers in the mask to be transferred */ - nr_regs = hweight16(REGMASK_BITS(instr)) * 4; - - rn = RN_BITS(instr); - newaddr = eaddr = regs->uregs[rn]; - - if (!LDST_U_BIT(instr)) - nr_regs = -nr_regs; - newaddr += nr_regs; - if (!LDST_U_BIT(instr)) - eaddr = newaddr; - - if (LDST_P_EQ_U(instr)) /* U = P */ - eaddr += 4; - - /* - * This is a "hint" - we already have eaddr worked out by the - * processor for us. - */ - if (addr != eaddr) { - printk(KERN_ERR "LDMSTM: PC = %08lx, instr = %08lx, " - "addr = %08lx, eaddr = %08lx\n", - instruction_pointer(regs), instr, addr, eaddr); - show_regs(regs); - } - - if (LDM_H_BIT(instr)) - reg_correction = 0x10; - else - reg_correction = 0x00; - - for (regbits = REGMASK_BITS(instr), rd = 0; regbits; - regbits >>= 1, rd += 1) - if (regbits & 1) { - if (LDST_L_BIT(instr)) - get32_unaligned_check(regs-> - uregs[rd + reg_correction], eaddr); - else - put32_unaligned_check(regs-> - uregs[rd + reg_correction], eaddr); - eaddr += 4; - } - - if (LDST_W_BIT(instr)) - regs->uregs[rn] = newaddr; - return TYPE_DONE; - -fault: - regs->UCreg_pc -= pc_correction; - return TYPE_FAULT; - -bad: - printk(KERN_ERR "Alignment trap: not handling ldm with s-bit set\n"); - return TYPE_ERROR; -} - -static int -do_alignment(unsigned long addr, unsigned int error_code, struct pt_regs *regs) -{ - union offset_union offset; - unsigned long instr, instrptr; - int (*handler) (unsigned long addr, unsigned long instr, - struct pt_regs *regs); - unsigned int type; - - instrptr = instruction_pointer(regs); - if (instrptr >= PAGE_OFFSET) - instr = *(unsigned long *)instrptr; - else { - __asm__ __volatile__( - "ldw.u %0, [%1]\n" - : "=&r"(instr) - : "r"(instrptr)); - } - - regs->UCreg_pc += 4; - - switch (CODING_BITS(instr)) { - case 0x40000120: /* ldrh or strh */ - if (LDSTH_I_BIT(instr)) - offset.un = (instr & 0x3e00) >> 4 | (instr & 31); - else - offset.un = regs->uregs[RM_BITS(instr)]; - handler = do_alignment_ldrhstrh; - break; - - case 0x60000000: /* ldr or str immediate */ - case 0x60000100: /* ldr or str immediate */ - case 0x60000020: /* ldr or str immediate */ - case 0x60000120: /* ldr or str immediate */ - offset.un = OFFSET_BITS(instr); - handler = do_alignment_ldrstr; - break; - - case 0x40000000: /* ldr or str register */ - offset.un = regs->uregs[RM_BITS(instr)]; - { - unsigned int shiftval = SHIFT_BITS(instr); - - switch (SHIFT_TYPE(instr)) { - case SHIFT_LSL: - offset.un <<= shiftval; - break; - - case SHIFT_LSR: - offset.un >>= shiftval; - break; - - case SHIFT_ASR: - offset.sn >>= shiftval; - break; - - case SHIFT_RORRRX: - if (shiftval == 0) { - offset.un >>= 1; - if (regs->UCreg_asr & PSR_C_BIT) - offset.un |= 1 << 31; - } else - offset.un = offset.un >> shiftval | - offset.un << (32 - shiftval); - break; - } - } - handler = do_alignment_ldrstr; - break; - - case 0x80000000: /* ldm or stm */ - case 0x80000020: /* ldm or stm */ - handler = do_alignment_ldmstm; - break; - - default: - goto bad; - } - - type = handler(addr, instr, regs); - - if (type == TYPE_ERROR || type == TYPE_FAULT) - goto bad_or_fault; - - if (type == TYPE_LDST) - do_alignment_finish_ldst(addr, instr, regs, offset); - - return 0; - -bad_or_fault: - if (type == TYPE_ERROR) - goto bad; - regs->UCreg_pc -= 4; - /* - * We got a fault - fix it up, or die. - */ - do_bad_area(addr, error_code, regs); - return 0; - -bad: - /* - * Oops, we didn't handle the instruction. - * However, we must handle fpu instr firstly. - */ -#ifdef CONFIG_UNICORE_FPU_F64 - /* handle co.load/store */ -#define CODING_COLS 0xc0000000 -#define COLS_OFFSET_BITS(i) (i & 0x1FF) -#define COLS_L_BITS(i) (i & (1<<24)) -#define COLS_FN_BITS(i) ((i>>14) & 31) - if ((instr & 0xe0000000) == CODING_COLS) { - unsigned int fn = COLS_FN_BITS(instr); - unsigned long val = 0; - if (COLS_L_BITS(instr)) { - get32t_unaligned_check(val, addr); - switch (fn) { -#define ASM_MTF(n) case n: \ - __asm__ __volatile__("MTF %0, F" __stringify(n) \ - : : "r"(val)); \ - break; - ASM_MTF(0); ASM_MTF(1); ASM_MTF(2); ASM_MTF(3); - ASM_MTF(4); ASM_MTF(5); ASM_MTF(6); ASM_MTF(7); - ASM_MTF(8); ASM_MTF(9); ASM_MTF(10); ASM_MTF(11); - ASM_MTF(12); ASM_MTF(13); ASM_MTF(14); ASM_MTF(15); - ASM_MTF(16); ASM_MTF(17); ASM_MTF(18); ASM_MTF(19); - ASM_MTF(20); ASM_MTF(21); ASM_MTF(22); ASM_MTF(23); - ASM_MTF(24); ASM_MTF(25); ASM_MTF(26); ASM_MTF(27); - ASM_MTF(28); ASM_MTF(29); ASM_MTF(30); ASM_MTF(31); -#undef ASM_MTF - } - } else { - switch (fn) { -#define ASM_MFF(n) case n: \ - __asm__ __volatile__("MFF %0, F" __stringify(n) \ - : : "r"(val)); \ - break; - ASM_MFF(0); ASM_MFF(1); ASM_MFF(2); ASM_MFF(3); - ASM_MFF(4); ASM_MFF(5); ASM_MFF(6); ASM_MFF(7); - ASM_MFF(8); ASM_MFF(9); ASM_MFF(10); ASM_MFF(11); - ASM_MFF(12); ASM_MFF(13); ASM_MFF(14); ASM_MFF(15); - ASM_MFF(16); ASM_MFF(17); ASM_MFF(18); ASM_MFF(19); - ASM_MFF(20); ASM_MFF(21); ASM_MFF(22); ASM_MFF(23); - ASM_MFF(24); ASM_MFF(25); ASM_MFF(26); ASM_MFF(27); - ASM_MFF(28); ASM_MFF(29); ASM_MFF(30); ASM_MFF(31); -#undef ASM_MFF - } - put32t_unaligned_check(val, addr); - } - return TYPE_COLS; - } -fault: - return TYPE_FAULT; -#endif - printk(KERN_ERR "Alignment trap: not handling instruction " - "%08lx at [<%08lx>]\n", instr, instrptr); - return 1; -} - -/* - * This needs to be done after sysctl_init, otherwise sys/ will be - * overwritten. Actually, this shouldn't be in sys/ at all since - * it isn't a sysctl, and it doesn't contain sysctl information. - */ -static int __init alignment_init(void) -{ - hook_fault_code(1, do_alignment, SIGBUS, BUS_ADRALN, - "alignment exception"); - - return 0; -} - -fs_initcall(alignment_init); |