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Diffstat (limited to 'arch/nds32/mm/alignment.c')
-rw-r--r--arch/nds32/mm/alignment.c579
1 files changed, 0 insertions, 579 deletions
diff --git a/arch/nds32/mm/alignment.c b/arch/nds32/mm/alignment.c
deleted file mode 100644
index c8b9061a2ee3..000000000000
--- a/arch/nds32/mm/alignment.c
+++ /dev/null
@@ -1,579 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-// Copyright (C) 2005-2017 Andes Technology Corporation
-
-#include <linux/proc_fs.h>
-#include <linux/uaccess.h>
-#include <linux/sysctl.h>
-#include <asm/unaligned.h>
-
-#define DEBUG(enable, tagged, ...) \
- do{ \
- if (enable) { \
- if (tagged) \
- pr_warn("[ %30s() ] ", __func__); \
- pr_warn(__VA_ARGS__); \
- } \
- } while (0)
-
-#define RT(inst) (((inst) >> 20) & 0x1FUL)
-#define RA(inst) (((inst) >> 15) & 0x1FUL)
-#define RB(inst) (((inst) >> 10) & 0x1FUL)
-#define SV(inst) (((inst) >> 8) & 0x3UL)
-#define IMM(inst) (((inst) >> 0) & 0x7FFFUL)
-
-#define RA3(inst) (((inst) >> 3) & 0x7UL)
-#define RT3(inst) (((inst) >> 6) & 0x7UL)
-#define IMM3U(inst) (((inst) >> 0) & 0x7UL)
-
-#define RA5(inst) (((inst) >> 0) & 0x1FUL)
-#define RT4(inst) (((inst) >> 5) & 0xFUL)
-
-#define GET_IMMSVAL(imm_value) \
- (((imm_value >> 14) & 0x1) ? (imm_value - 0x8000) : imm_value)
-
-#define __get8_data(val,addr,err) \
- __asm__( \
- "1: lbi.bi %1, [%2], #1\n" \
- "2:\n" \
- " .pushsection .text.fixup,\"ax\"\n" \
- " .align 2\n" \
- "3: movi %0, #1\n" \
- " j 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_data(addr, val_ptr) \
- do { \
- unsigned int err = 0, v, a = addr; \
- __get8_data(v,a,err); \
- *val_ptr = v << 0; \
- __get8_data(v,a,err); \
- *val_ptr |= v << 8; \
- if (err) \
- goto fault; \
- *val_ptr = le16_to_cpu(*val_ptr); \
- } while(0)
-
-#define get32_data(addr, val_ptr) \
- do { \
- unsigned int err = 0, v, a = addr; \
- __get8_data(v,a,err); \
- *val_ptr = v << 0; \
- __get8_data(v,a,err); \
- *val_ptr |= v << 8; \
- __get8_data(v,a,err); \
- *val_ptr |= v << 16; \
- __get8_data(v,a,err); \
- *val_ptr |= v << 24; \
- if (err) \
- goto fault; \
- *val_ptr = le32_to_cpu(*val_ptr); \
- } while(0)
-
-#define get_data(addr, val_ptr, len) \
- if (len == 2) \
- get16_data(addr, val_ptr); \
- else \
- get32_data(addr, val_ptr);
-
-#define set16_data(addr, val) \
- do { \
- unsigned int err = 0, *ptr = addr ; \
- val = le32_to_cpu(val); \
- __asm__( \
- "1: sbi.bi %2, [%1], #1\n" \
- " srli %2, %2, #8\n" \
- "2: sbi %2, [%1]\n" \
- "3:\n" \
- " .pushsection .text.fixup,\"ax\"\n" \
- " .align 2\n" \
- "4: movi %0, #1\n" \
- " j 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" (ptr), "+r" (val) \
- : "0" (err) \
- ); \
- if (err) \
- goto fault; \
- } while(0)
-
-#define set32_data(addr, val) \
- do { \
- unsigned int err = 0, *ptr = addr ; \
- val = le32_to_cpu(val); \
- __asm__( \
- "1: sbi.bi %2, [%1], #1\n" \
- " srli %2, %2, #8\n" \
- "2: sbi.bi %2, [%1], #1\n" \
- " srli %2, %2, #8\n" \
- "3: sbi.bi %2, [%1], #1\n" \
- " srli %2, %2, #8\n" \
- "4: sbi %2, [%1]\n" \
- "5:\n" \
- " .pushsection .text.fixup,\"ax\"\n" \
- " .align 2\n" \
- "6: movi %0, #1\n" \
- " j 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" (ptr), "+r" (val) \
- : "0" (err) \
- ); \
- if (err) \
- goto fault; \
- } while(0)
-#define set_data(addr, val, len) \
- if (len == 2) \
- set16_data(addr, val); \
- else \
- set32_data(addr, val);
-#define NDS32_16BIT_INSTRUCTION 0x80000000
-
-extern pte_t va_present(struct mm_struct *mm, unsigned long addr);
-extern pte_t va_kernel_present(unsigned long addr);
-extern int va_readable(struct pt_regs *regs, unsigned long addr);
-extern int va_writable(struct pt_regs *regs, unsigned long addr);
-
-int unalign_access_mode = 0, unalign_access_debug = 0;
-
-static inline unsigned long *idx_to_addr(struct pt_regs *regs, int idx)
-{
- /* this should be consistent with ptrace.h */
- if (idx >= 0 && idx <= 25) /* R0-R25 */
- return &regs->uregs[0] + idx;
- else if (idx >= 28 && idx <= 30) /* FP, GP, LP */
- return &regs->fp + (idx - 28);
- else if (idx == 31) /* SP */
- return &regs->sp;
- else
- return NULL; /* cause a segfault */
-}
-
-static inline unsigned long get_inst(unsigned long addr)
-{
- return be32_to_cpu(get_unaligned((u32 *) addr));
-}
-
-static inline unsigned long sign_extend(unsigned long val, int len)
-{
- unsigned long ret = 0;
- unsigned char *s, *t;
- int i = 0;
-
- val = cpu_to_le32(val);
-
- s = (void *)&val;
- t = (void *)&ret;
-
- while (i++ < len)
- *t++ = *s++;
-
- if (((*(t - 1)) & 0x80) && (i < 4)) {
-
- while (i++ <= 4)
- *t++ = 0xff;
- }
-
- return le32_to_cpu(ret);
-}
-
-static inline int do_16(unsigned long inst, struct pt_regs *regs)
-{
- int imm, regular, load, len, addr_mode, idx_mode;
- unsigned long unaligned_addr, target_val, source_idx, target_idx,
- shift = 0;
- switch ((inst >> 9) & 0x3F) {
-
- case 0x12: /* LHI333 */
- imm = 1;
- regular = 1;
- load = 1;
- len = 2;
- addr_mode = 3;
- idx_mode = 3;
- break;
- case 0x10: /* LWI333 */
- imm = 1;
- regular = 1;
- load = 1;
- len = 4;
- addr_mode = 3;
- idx_mode = 3;
- break;
- case 0x11: /* LWI333.bi */
- imm = 1;
- regular = 0;
- load = 1;
- len = 4;
- addr_mode = 3;
- idx_mode = 3;
- break;
- case 0x1A: /* LWI450 */
- imm = 0;
- regular = 1;
- load = 1;
- len = 4;
- addr_mode = 5;
- idx_mode = 4;
- break;
- case 0x16: /* SHI333 */
- imm = 1;
- regular = 1;
- load = 0;
- len = 2;
- addr_mode = 3;
- idx_mode = 3;
- break;
- case 0x14: /* SWI333 */
- imm = 1;
- regular = 1;
- load = 0;
- len = 4;
- addr_mode = 3;
- idx_mode = 3;
- break;
- case 0x15: /* SWI333.bi */
- imm = 1;
- regular = 0;
- load = 0;
- len = 4;
- addr_mode = 3;
- idx_mode = 3;
- break;
- case 0x1B: /* SWI450 */
- imm = 0;
- regular = 1;
- load = 0;
- len = 4;
- addr_mode = 5;
- idx_mode = 4;
- break;
-
- default:
- return -EFAULT;
- }
-
- if (addr_mode == 3) {
- unaligned_addr = *idx_to_addr(regs, RA3(inst));
- source_idx = RA3(inst);
- } else {
- unaligned_addr = *idx_to_addr(regs, RA5(inst));
- source_idx = RA5(inst);
- }
-
- if (idx_mode == 3)
- target_idx = RT3(inst);
- else
- target_idx = RT4(inst);
-
- if (imm)
- shift = IMM3U(inst) * len;
-
- if (regular)
- unaligned_addr += shift;
-
- if (load) {
- if (!access_ok((void *)unaligned_addr, len))
- return -EACCES;
-
- get_data(unaligned_addr, &target_val, len);
- *idx_to_addr(regs, target_idx) = target_val;
- } else {
- if (!access_ok((void *)unaligned_addr, len))
- return -EACCES;
- target_val = *idx_to_addr(regs, target_idx);
- set_data((void *)unaligned_addr, target_val, len);
- }
-
- if (!regular)
- *idx_to_addr(regs, source_idx) = unaligned_addr + shift;
- regs->ipc += 2;
-
- return 0;
-fault:
- return -EACCES;
-}
-
-static inline int do_32(unsigned long inst, struct pt_regs *regs)
-{
- int imm, regular, load, len, sign_ext;
- unsigned long unaligned_addr, target_val, shift;
-
- unaligned_addr = *idx_to_addr(regs, RA(inst));
-
- switch ((inst >> 25) << 1) {
-
- case 0x02: /* LHI */
- imm = 1;
- regular = 1;
- load = 1;
- len = 2;
- sign_ext = 0;
- break;
- case 0x0A: /* LHI.bi */
- imm = 1;
- regular = 0;
- load = 1;
- len = 2;
- sign_ext = 0;
- break;
- case 0x22: /* LHSI */
- imm = 1;
- regular = 1;
- load = 1;
- len = 2;
- sign_ext = 1;
- break;
- case 0x2A: /* LHSI.bi */
- imm = 1;
- regular = 0;
- load = 1;
- len = 2;
- sign_ext = 1;
- break;
- case 0x04: /* LWI */
- imm = 1;
- regular = 1;
- load = 1;
- len = 4;
- sign_ext = 0;
- break;
- case 0x0C: /* LWI.bi */
- imm = 1;
- regular = 0;
- load = 1;
- len = 4;
- sign_ext = 0;
- break;
- case 0x12: /* SHI */
- imm = 1;
- regular = 1;
- load = 0;
- len = 2;
- sign_ext = 0;
- break;
- case 0x1A: /* SHI.bi */
- imm = 1;
- regular = 0;
- load = 0;
- len = 2;
- sign_ext = 0;
- break;
- case 0x14: /* SWI */
- imm = 1;
- regular = 1;
- load = 0;
- len = 4;
- sign_ext = 0;
- break;
- case 0x1C: /* SWI.bi */
- imm = 1;
- regular = 0;
- load = 0;
- len = 4;
- sign_ext = 0;
- break;
-
- default:
- switch (inst & 0xff) {
-
- case 0x01: /* LH */
- imm = 0;
- regular = 1;
- load = 1;
- len = 2;
- sign_ext = 0;
- break;
- case 0x05: /* LH.bi */
- imm = 0;
- regular = 0;
- load = 1;
- len = 2;
- sign_ext = 0;
- break;
- case 0x11: /* LHS */
- imm = 0;
- regular = 1;
- load = 1;
- len = 2;
- sign_ext = 1;
- break;
- case 0x15: /* LHS.bi */
- imm = 0;
- regular = 0;
- load = 1;
- len = 2;
- sign_ext = 1;
- break;
- case 0x02: /* LW */
- imm = 0;
- regular = 1;
- load = 1;
- len = 4;
- sign_ext = 0;
- break;
- case 0x06: /* LW.bi */
- imm = 0;
- regular = 0;
- load = 1;
- len = 4;
- sign_ext = 0;
- break;
- case 0x09: /* SH */
- imm = 0;
- regular = 1;
- load = 0;
- len = 2;
- sign_ext = 0;
- break;
- case 0x0D: /* SH.bi */
- imm = 0;
- regular = 0;
- load = 0;
- len = 2;
- sign_ext = 0;
- break;
- case 0x0A: /* SW */
- imm = 0;
- regular = 1;
- load = 0;
- len = 4;
- sign_ext = 0;
- break;
- case 0x0E: /* SW.bi */
- imm = 0;
- regular = 0;
- load = 0;
- len = 4;
- sign_ext = 0;
- break;
-
- default:
- return -EFAULT;
- }
- }
-
- if (imm)
- shift = GET_IMMSVAL(IMM(inst)) * len;
- else
- shift = *idx_to_addr(regs, RB(inst)) << SV(inst);
-
- if (regular)
- unaligned_addr += shift;
-
- if (load) {
-
- if (!access_ok((void *)unaligned_addr, len))
- return -EACCES;
-
- get_data(unaligned_addr, &target_val, len);
-
- if (sign_ext)
- *idx_to_addr(regs, RT(inst)) =
- sign_extend(target_val, len);
- else
- *idx_to_addr(regs, RT(inst)) = target_val;
- } else {
-
- if (!access_ok((void *)unaligned_addr, len))
- return -EACCES;
-
- target_val = *idx_to_addr(regs, RT(inst));
- set_data((void *)unaligned_addr, target_val, len);
- }
-
- if (!regular)
- *idx_to_addr(regs, RA(inst)) = unaligned_addr + shift;
-
- regs->ipc += 4;
-
- return 0;
-fault:
- return -EACCES;
-}
-
-int do_unaligned_access(unsigned long addr, struct pt_regs *regs)
-{
- unsigned long inst;
- int ret = -EFAULT;
- mm_segment_t seg = get_fs();
-
- inst = get_inst(regs->ipc);
-
- DEBUG((unalign_access_debug > 0), 1,
- "Faulting addr: 0x%08lx, pc: 0x%08lx [inst: 0x%08lx ]\n", addr,
- regs->ipc, inst);
-
- set_fs(USER_DS);
-
- if (inst & NDS32_16BIT_INSTRUCTION)
- ret = do_16((inst >> 16) & 0xffff, regs);
- else
- ret = do_32(inst, regs);
- set_fs(seg);
-
- return ret;
-}
-
-#ifdef CONFIG_PROC_FS
-
-static struct ctl_table alignment_tbl[3] = {
- {
- .procname = "enable",
- .data = &unalign_access_mode,
- .maxlen = sizeof(unalign_access_mode),
- .mode = 0666,
- .proc_handler = &proc_dointvec
- }
- ,
- {
- .procname = "debug_info",
- .data = &unalign_access_debug,
- .maxlen = sizeof(unalign_access_debug),
- .mode = 0644,
- .proc_handler = &proc_dointvec
- }
- ,
- {}
-};
-
-static struct ctl_table nds32_sysctl_table[2] = {
- {
- .procname = "unaligned_access",
- .mode = 0555,
- .child = alignment_tbl},
- {}
-};
-
-static struct ctl_path nds32_path[2] = {
- {.procname = "nds32"},
- {}
-};
-
-/*
- * Initialize nds32 alignment-correction interface
- */
-static int __init nds32_sysctl_init(void)
-{
- register_sysctl_paths(nds32_path, nds32_sysctl_table);
- return 0;
-}
-
-__initcall(nds32_sysctl_init);
-#endif /* CONFIG_PROC_FS */
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