summaryrefslogtreecommitdiffstats
path: root/arch/m32r/kernel/align.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/m32r/kernel/align.c')
-rw-r--r--arch/m32r/kernel/align.c585
1 files changed, 585 insertions, 0 deletions
diff --git a/arch/m32r/kernel/align.c b/arch/m32r/kernel/align.c
new file mode 100644
index 000000000000..48ec29714238
--- /dev/null
+++ b/arch/m32r/kernel/align.c
@@ -0,0 +1,585 @@
+/*
+ * align.c - address exception handler for M32R
+ *
+ * Copyright (c) 2003 Hitoshi Yamamoto
+ */
+
+#include <linux/config.h>
+#include <asm/ptrace.h>
+#include <asm/uaccess.h>
+
+static int get_reg(struct pt_regs *regs, int nr)
+{
+ int val;
+
+ if (nr < 4)
+ val = *(unsigned long *)(&regs->r0 + nr);
+ else if (nr < 7)
+ val = *(unsigned long *)(&regs->r4 + (nr - 4));
+ else if (nr < 13)
+ val = *(unsigned long *)(&regs->r7 + (nr - 7));
+ else
+ val = *(unsigned long *)(&regs->fp + (nr - 13));
+
+ return val;
+}
+
+static void set_reg(struct pt_regs *regs, int nr, int val)
+{
+ if (nr < 4)
+ *(unsigned long *)(&regs->r0 + nr) = val;
+ else if (nr < 7)
+ *(unsigned long *)(&regs->r4 + (nr - 4)) = val;
+ else if (nr < 13)
+ *(unsigned long *)(&regs->r7 + (nr - 7)) = val;
+ else
+ *(unsigned long *)(&regs->fp + (nr - 13)) = val;
+}
+
+#define REG1(insn) (((insn) & 0x0f00) >> 8)
+#define REG2(insn) ((insn) & 0x000f)
+#define PSW_BC 0x100
+
+/* O- instruction */
+#define ISA_LD1 0x20c0 /* ld Rdest, @Rsrc */
+#define ISA_LD2 0x20e0 /* ld Rdest, @Rsrc+ */
+#define ISA_LDH 0x20a0 /* ldh Rdest, @Rsrc */
+#define ISA_LDUH 0x20b0 /* lduh Rdest, @Rsrc */
+#define ISA_ST1 0x2040 /* st Rsrc1, @Rsrc2 */
+#define ISA_ST2 0x2060 /* st Rsrc1, @+Rsrc2 */
+#define ISA_ST3 0x2070 /* st Rsrc1, @-Rsrc2 */
+#define ISA_STH1 0x2020 /* sth Rsrc1, @Rsrc2 */
+#define ISA_STH2 0x2030 /* sth Rsrc1, @Rsrc2+ */
+
+#ifdef CONFIG_ISA_DUAL_ISSUE
+
+/* OS instruction */
+#define ISA_ADD 0x00a0 /* add Rdest, Rsrc */
+#define ISA_ADDI 0x4000 /* addi Rdest, #imm8 */
+#define ISA_ADDX 0x0090 /* addx Rdest, Rsrc */
+#define ISA_AND 0x00c0 /* and Rdest, Rsrc */
+#define ISA_CMP 0x0040 /* cmp Rsrc1, Rsrc2 */
+#define ISA_CMPEQ 0x0060 /* cmpeq Rsrc1, Rsrc2 */
+#define ISA_CMPU 0x0050 /* cmpu Rsrc1, Rsrc2 */
+#define ISA_CMPZ 0x0070 /* cmpz Rsrc */
+#define ISA_LDI 0x6000 /* ldi Rdest, #imm8 */
+#define ISA_MV 0x1080 /* mv Rdest, Rsrc */
+#define ISA_NEG 0x0030 /* neg Rdest, Rsrc */
+#define ISA_NOP 0x7000 /* nop */
+#define ISA_NOT 0x00b0 /* not Rdest, Rsrc */
+#define ISA_OR 0x00e0 /* or Rdest, Rsrc */
+#define ISA_SUB 0x0020 /* sub Rdest, Rsrc */
+#define ISA_SUBX 0x0010 /* subx Rdest, Rsrc */
+#define ISA_XOR 0x00d0 /* xor Rdest, Rsrc */
+
+/* -S instruction */
+#define ISA_MUL 0x1060 /* mul Rdest, Rsrc */
+#define ISA_MULLO_A0 0x3010 /* mullo Rsrc1, Rsrc2, A0 */
+#define ISA_MULLO_A1 0x3090 /* mullo Rsrc1, Rsrc2, A1 */
+#define ISA_MVFACMI_A0 0x50f2 /* mvfacmi Rdest, A0 */
+#define ISA_MVFACMI_A1 0x50f6 /* mvfacmi Rdest, A1 */
+
+static int emu_addi(unsigned short insn, struct pt_regs *regs)
+{
+ char imm = (char)(insn & 0xff);
+ int dest = REG1(insn);
+ int val;
+
+ val = get_reg(regs, dest);
+ val += imm;
+ set_reg(regs, dest, val);
+
+ return 0;
+}
+
+static int emu_ldi(unsigned short insn, struct pt_regs *regs)
+{
+ char imm = (char)(insn & 0xff);
+
+ set_reg(regs, REG1(insn), (int)imm);
+
+ return 0;
+}
+
+static int emu_add(unsigned short insn, struct pt_regs *regs)
+{
+ int dest = REG1(insn);
+ int src = REG2(insn);
+ int val;
+
+ val = get_reg(regs, dest);
+ val += get_reg(regs, src);
+ set_reg(regs, dest, val);
+
+ return 0;
+}
+
+static int emu_addx(unsigned short insn, struct pt_regs *regs)
+{
+ int dest = REG1(insn);
+ unsigned int val, tmp;
+
+ val = regs->psw & PSW_BC ? 1 : 0;
+ tmp = get_reg(regs, dest);
+ val += tmp;
+ val += (unsigned int)get_reg(regs, REG2(insn));
+ set_reg(regs, dest, val);
+
+ /* C bit set */
+ if (val < tmp)
+ regs->psw |= PSW_BC;
+ else
+ regs->psw &= ~(PSW_BC);
+
+ return 0;
+}
+
+static int emu_and(unsigned short insn, struct pt_regs *regs)
+{
+ int dest = REG1(insn);
+ int val;
+
+ val = get_reg(regs, dest);
+ val &= get_reg(regs, REG2(insn));
+ set_reg(regs, dest, val);
+
+ return 0;
+}
+
+static int emu_cmp(unsigned short insn, struct pt_regs *regs)
+{
+ if (get_reg(regs, REG1(insn)) < get_reg(regs, REG2(insn)))
+ regs->psw |= PSW_BC;
+ else
+ regs->psw &= ~(PSW_BC);
+
+ return 0;
+}
+
+static int emu_cmpeq(unsigned short insn, struct pt_regs *regs)
+{
+ if (get_reg(regs, REG1(insn)) == get_reg(regs, REG2(insn)))
+ regs->psw |= PSW_BC;
+ else
+ regs->psw &= ~(PSW_BC);
+
+ return 0;
+}
+
+static int emu_cmpu(unsigned short insn, struct pt_regs *regs)
+{
+ if ((unsigned int)get_reg(regs, REG1(insn))
+ < (unsigned int)get_reg(regs, REG2(insn)))
+ regs->psw |= PSW_BC;
+ else
+ regs->psw &= ~(PSW_BC);
+
+ return 0;
+}
+
+static int emu_cmpz(unsigned short insn, struct pt_regs *regs)
+{
+ if (!get_reg(regs, REG2(insn)))
+ regs->psw |= PSW_BC;
+ else
+ regs->psw &= ~(PSW_BC);
+
+ return 0;
+}
+
+static int emu_mv(unsigned short insn, struct pt_regs *regs)
+{
+ int val;
+
+ val = get_reg(regs, REG2(insn));
+ set_reg(regs, REG1(insn), val);
+
+ return 0;
+}
+
+static int emu_neg(unsigned short insn, struct pt_regs *regs)
+{
+ int val;
+
+ val = get_reg(regs, REG2(insn));
+ set_reg(regs, REG1(insn), 0 - val);
+
+ return 0;
+}
+
+static int emu_not(unsigned short insn, struct pt_regs *regs)
+{
+ int val;
+
+ val = get_reg(regs, REG2(insn));
+ set_reg(regs, REG1(insn), ~val);
+
+ return 0;
+}
+
+static int emu_or(unsigned short insn, struct pt_regs *regs)
+{
+ int dest = REG1(insn);
+ int val;
+
+ val = get_reg(regs, dest);
+ val |= get_reg(regs, REG2(insn));
+ set_reg(regs, dest, val);
+
+ return 0;
+}
+
+static int emu_sub(unsigned short insn, struct pt_regs *regs)
+{
+ int dest = REG1(insn);
+ int val;
+
+ val = get_reg(regs, dest);
+ val -= get_reg(regs, REG2(insn));
+ set_reg(regs, dest, val);
+
+ return 0;
+}
+
+static int emu_subx(unsigned short insn, struct pt_regs *regs)
+{
+ int dest = REG1(insn);
+ unsigned int val, tmp;
+
+ val = tmp = get_reg(regs, dest);
+ val -= (unsigned int)get_reg(regs, REG2(insn));
+ val -= regs->psw & PSW_BC ? 1 : 0;
+ set_reg(regs, dest, val);
+
+ /* C bit set */
+ if (val > tmp)
+ regs->psw |= PSW_BC;
+ else
+ regs->psw &= ~(PSW_BC);
+
+ return 0;
+}
+
+static int emu_xor(unsigned short insn, struct pt_regs *regs)
+{
+ int dest = REG1(insn);
+ unsigned int val;
+
+ val = (unsigned int)get_reg(regs, dest);
+ val ^= (unsigned int)get_reg(regs, REG2(insn));
+ set_reg(regs, dest, val);
+
+ return 0;
+}
+
+static int emu_mul(unsigned short insn, struct pt_regs *regs)
+{
+ int dest = REG1(insn);
+ int reg1, reg2;
+
+ reg1 = get_reg(regs, dest);
+ reg2 = get_reg(regs, REG2(insn));
+
+ __asm__ __volatile__ (
+ "mul %0, %1; \n\t"
+ : "+r" (reg1) : "r" (reg2)
+ );
+
+ set_reg(regs, dest, reg1);
+
+ return 0;
+}
+
+static int emu_mullo_a0(unsigned short insn, struct pt_regs *regs)
+{
+ int reg1, reg2;
+
+ reg1 = get_reg(regs, REG1(insn));
+ reg2 = get_reg(regs, REG2(insn));
+
+ __asm__ __volatile__ (
+ "mullo %0, %1, a0; \n\t"
+ "mvfachi %0, a0; \n\t"
+ "mvfaclo %1, a0; \n\t"
+ : "+r" (reg1), "+r" (reg2)
+ );
+
+ regs->acc0h = reg1;
+ regs->acc0l = reg2;
+
+ return 0;
+}
+
+static int emu_mullo_a1(unsigned short insn, struct pt_regs *regs)
+{
+ int reg1, reg2;
+
+ reg1 = get_reg(regs, REG1(insn));
+ reg2 = get_reg(regs, REG2(insn));
+
+ __asm__ __volatile__ (
+ "mullo %0, %1, a0; \n\t"
+ "mvfachi %0, a0; \n\t"
+ "mvfaclo %1, a0; \n\t"
+ : "+r" (reg1), "+r" (reg2)
+ );
+
+ regs->acc1h = reg1;
+ regs->acc1l = reg2;
+
+ return 0;
+}
+
+static int emu_mvfacmi_a0(unsigned short insn, struct pt_regs *regs)
+{
+ unsigned long val;
+
+ val = (regs->acc0h << 16) | (regs->acc0l >> 16);
+ set_reg(regs, REG1(insn), (int)val);
+
+ return 0;
+}
+
+static int emu_mvfacmi_a1(unsigned short insn, struct pt_regs *regs)
+{
+ unsigned long val;
+
+ val = (regs->acc1h << 16) | (regs->acc1l >> 16);
+ set_reg(regs, REG1(insn), (int)val);
+
+ return 0;
+}
+
+static int emu_m32r2(unsigned short insn, struct pt_regs *regs)
+{
+ int res = -1;
+
+ if ((insn & 0x7fff) == ISA_NOP) /* nop */
+ return 0;
+
+ switch(insn & 0x7000) {
+ case ISA_ADDI: /* addi Rdest, #imm8 */
+ res = emu_addi(insn, regs);
+ break;
+ case ISA_LDI: /* ldi Rdest, #imm8 */
+ res = emu_ldi(insn, regs);
+ break;
+ default:
+ break;
+ }
+
+ if (!res)
+ return 0;
+
+ switch(insn & 0x70f0) {
+ case ISA_ADD: /* add Rdest, Rsrc */
+ res = emu_add(insn, regs);
+ break;
+ case ISA_ADDX: /* addx Rdest, Rsrc */
+ res = emu_addx(insn, regs);
+ break;
+ case ISA_AND: /* and Rdest, Rsrc */
+ res = emu_and(insn, regs);
+ break;
+ case ISA_CMP: /* cmp Rsrc1, Rsrc2 */
+ res = emu_cmp(insn, regs);
+ break;
+ case ISA_CMPEQ: /* cmpeq Rsrc1, Rsrc2 */
+ res = emu_cmpeq(insn, regs);
+ break;
+ case ISA_CMPU: /* cmpu Rsrc1, Rsrc2 */
+ res = emu_cmpu(insn, regs);
+ break;
+ case ISA_CMPZ: /* cmpz Rsrc */
+ res = emu_cmpz(insn, regs);
+ break;
+ case ISA_MV: /* mv Rdest, Rsrc */
+ res = emu_mv(insn, regs);
+ break;
+ case ISA_NEG: /* neg Rdest, Rsrc */
+ res = emu_neg(insn, regs);
+ break;
+ case ISA_NOT: /* not Rdest, Rsrc */
+ res = emu_not(insn, regs);
+ break;
+ case ISA_OR: /* or Rdest, Rsrc */
+ res = emu_or(insn, regs);
+ break;
+ case ISA_SUB: /* sub Rdest, Rsrc */
+ res = emu_sub(insn, regs);
+ break;
+ case ISA_SUBX: /* subx Rdest, Rsrc */
+ res = emu_subx(insn, regs);
+ break;
+ case ISA_XOR: /* xor Rdest, Rsrc */
+ res = emu_xor(insn, regs);
+ break;
+ case ISA_MUL: /* mul Rdest, Rsrc */
+ res = emu_mul(insn, regs);
+ break;
+ case ISA_MULLO_A0: /* mullo Rsrc1, Rsrc2 */
+ res = emu_mullo_a0(insn, regs);
+ break;
+ case ISA_MULLO_A1: /* mullo Rsrc1, Rsrc2 */
+ res = emu_mullo_a1(insn, regs);
+ break;
+ default:
+ break;
+ }
+
+ if (!res)
+ return 0;
+
+ switch(insn & 0x70ff) {
+ case ISA_MVFACMI_A0: /* mvfacmi Rdest */
+ res = emu_mvfacmi_a0(insn, regs);
+ break;
+ case ISA_MVFACMI_A1: /* mvfacmi Rdest */
+ res = emu_mvfacmi_a1(insn, regs);
+ break;
+ default:
+ break;
+ }
+
+ return res;
+}
+
+#endif /* CONFIG_ISA_DUAL_ISSUE */
+
+/*
+ * ld : ?010 dest 1100 src
+ * 0010 dest 1110 src : ld Rdest, @Rsrc+
+ * ldh : ?010 dest 1010 src
+ * lduh : ?010 dest 1011 src
+ * st : ?010 src1 0100 src2
+ * 0010 src1 0110 src2 : st Rsrc1, @+Rsrc2
+ * 0010 src1 0111 src2 : st Rsrc1, @-Rsrc2
+ * sth : ?010 src1 0010 src2
+ */
+
+static int insn_check(unsigned long insn, struct pt_regs *regs,
+ unsigned char **ucp)
+{
+ int res = 0;
+
+ /*
+ * 32bit insn
+ * ld Rdest, @(disp16, Rsrc)
+ * st Rdest, @(disp16, Rsrc)
+ */
+ if (insn & 0x80000000) { /* 32bit insn */
+ *ucp += (short)(insn & 0x0000ffff);
+ regs->bpc += 4;
+ } else { /* 16bit insn */
+#ifdef CONFIG_ISA_DUAL_ISSUE
+ /* parallel exec check */
+ if (!(regs->bpc & 0x2) && insn & 0x8000) {
+ res = emu_m32r2((unsigned short)insn, regs);
+ regs->bpc += 4;
+ } else
+#endif /* CONFIG_ISA_DUAL_ISSUE */
+ regs->bpc += 2;
+ }
+
+ return res;
+}
+
+static int emu_ld(unsigned long insn32, struct pt_regs *regs)
+{
+ unsigned char *ucp;
+ unsigned long val;
+ unsigned short insn16;
+ int size, src;
+
+ insn16 = insn32 >> 16;
+ src = REG2(insn16);
+ ucp = (unsigned char *)get_reg(regs, src);
+
+ if (insn_check(insn32, regs, &ucp))
+ return -1;
+
+ size = insn16 & 0x0040 ? 4 : 2;
+ if (copy_from_user(&val, ucp, size))
+ return -1;
+
+ if (size == 2)
+ val >>= 16;
+
+ /* ldh sign check */
+ if ((insn16 & 0x00f0) == 0x00a0 && (val & 0x8000))
+ val |= 0xffff0000;
+
+ set_reg(regs, REG1(insn16), val);
+
+ /* ld increment check */
+ if ((insn16 & 0xf0f0) == ISA_LD2) /* ld Rdest, @Rsrc+ */
+ set_reg(regs, src, (unsigned long)(ucp + 4));
+
+ return 0;
+}
+
+static int emu_st(unsigned long insn32, struct pt_regs *regs)
+{
+ unsigned char *ucp;
+ unsigned long val;
+ unsigned short insn16;
+ int size, src2;
+
+ insn16 = insn32 >> 16;
+ src2 = REG2(insn16);
+
+ ucp = (unsigned char *)get_reg(regs, src2);
+
+ if (insn_check(insn32, regs, &ucp))
+ return -1;
+
+ size = insn16 & 0x0040 ? 4 : 2;
+ val = get_reg(regs, REG1(insn16));
+ if (size == 2)
+ val <<= 16;
+
+ /* st inc/dec check */
+ if ((insn16 & 0xf0e0) == 0x2060) {
+ if (insn16 & 0x0010)
+ ucp -= 4;
+ else
+ ucp += 4;
+
+ set_reg(regs, src2, (unsigned long)ucp);
+ }
+
+ if (copy_to_user(ucp, &val, size))
+ return -1;
+
+ /* sth inc check */
+ if ((insn16 & 0xf0f0) == ISA_STH2) {
+ ucp += 2;
+ set_reg(regs, src2, (unsigned long)ucp);
+ }
+
+ return 0;
+}
+
+int handle_unaligned_access(unsigned long insn32, struct pt_regs *regs)
+{
+ unsigned short insn16;
+ int res;
+
+ insn16 = insn32 >> 16;
+
+ /* ld or st check */
+ if ((insn16 & 0x7000) != 0x2000)
+ return -1;
+
+ /* insn alignment check */
+ if ((insn16 & 0x8000) && (regs->bpc & 3))
+ return -1;
+
+ if (insn16 & 0x0080) /* ld */
+ res = emu_ld(insn32, regs);
+ else /* st */
+ res = emu_st(insn32, regs);
+
+ return res;
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 19:35:52 +0000