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-rw-r--r--arch/sparc/kernel/visemul.c899
1 files changed, 899 insertions, 0 deletions
diff --git a/arch/sparc/kernel/visemul.c b/arch/sparc/kernel/visemul.c
new file mode 100644
index 000000000..64ed80ed6
--- /dev/null
+++ b/arch/sparc/kernel/visemul.c
@@ -0,0 +1,899 @@
+// SPDX-License-Identifier: GPL-2.0
+/* visemul.c: Emulation of VIS instructions.
+ *
+ * Copyright (C) 2006 David S. Miller (davem@davemloft.net)
+ */
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/thread_info.h>
+#include <linux/perf_event.h>
+
+#include <asm/ptrace.h>
+#include <asm/pstate.h>
+#include <asm/fpumacro.h>
+#include <linux/uaccess.h>
+#include <asm/cacheflush.h>
+
+/* OPF field of various VIS instructions. */
+
+/* 000111011 - four 16-bit packs */
+#define FPACK16_OPF 0x03b
+
+/* 000111010 - two 32-bit packs */
+#define FPACK32_OPF 0x03a
+
+/* 000111101 - four 16-bit packs */
+#define FPACKFIX_OPF 0x03d
+
+/* 001001101 - four 16-bit expands */
+#define FEXPAND_OPF 0x04d
+
+/* 001001011 - two 32-bit merges */
+#define FPMERGE_OPF 0x04b
+
+/* 000110001 - 8-by-16-bit partitioned product */
+#define FMUL8x16_OPF 0x031
+
+/* 000110011 - 8-by-16-bit upper alpha partitioned product */
+#define FMUL8x16AU_OPF 0x033
+
+/* 000110101 - 8-by-16-bit lower alpha partitioned product */
+#define FMUL8x16AL_OPF 0x035
+
+/* 000110110 - upper 8-by-16-bit partitioned product */
+#define FMUL8SUx16_OPF 0x036
+
+/* 000110111 - lower 8-by-16-bit partitioned product */
+#define FMUL8ULx16_OPF 0x037
+
+/* 000111000 - upper 8-by-16-bit partitioned product */
+#define FMULD8SUx16_OPF 0x038
+
+/* 000111001 - lower unsigned 8-by-16-bit partitioned product */
+#define FMULD8ULx16_OPF 0x039
+
+/* 000101000 - four 16-bit compare; set rd if src1 > src2 */
+#define FCMPGT16_OPF 0x028
+
+/* 000101100 - two 32-bit compare; set rd if src1 > src2 */
+#define FCMPGT32_OPF 0x02c
+
+/* 000100000 - four 16-bit compare; set rd if src1 <= src2 */
+#define FCMPLE16_OPF 0x020
+
+/* 000100100 - two 32-bit compare; set rd if src1 <= src2 */
+#define FCMPLE32_OPF 0x024
+
+/* 000100010 - four 16-bit compare; set rd if src1 != src2 */
+#define FCMPNE16_OPF 0x022
+
+/* 000100110 - two 32-bit compare; set rd if src1 != src2 */
+#define FCMPNE32_OPF 0x026
+
+/* 000101010 - four 16-bit compare; set rd if src1 == src2 */
+#define FCMPEQ16_OPF 0x02a
+
+/* 000101110 - two 32-bit compare; set rd if src1 == src2 */
+#define FCMPEQ32_OPF 0x02e
+
+/* 000000000 - Eight 8-bit edge boundary processing */
+#define EDGE8_OPF 0x000
+
+/* 000000001 - Eight 8-bit edge boundary processing, no CC */
+#define EDGE8N_OPF 0x001
+
+/* 000000010 - Eight 8-bit edge boundary processing, little-endian */
+#define EDGE8L_OPF 0x002
+
+/* 000000011 - Eight 8-bit edge boundary processing, little-endian, no CC */
+#define EDGE8LN_OPF 0x003
+
+/* 000000100 - Four 16-bit edge boundary processing */
+#define EDGE16_OPF 0x004
+
+/* 000000101 - Four 16-bit edge boundary processing, no CC */
+#define EDGE16N_OPF 0x005
+
+/* 000000110 - Four 16-bit edge boundary processing, little-endian */
+#define EDGE16L_OPF 0x006
+
+/* 000000111 - Four 16-bit edge boundary processing, little-endian, no CC */
+#define EDGE16LN_OPF 0x007
+
+/* 000001000 - Two 32-bit edge boundary processing */
+#define EDGE32_OPF 0x008
+
+/* 000001001 - Two 32-bit edge boundary processing, no CC */
+#define EDGE32N_OPF 0x009
+
+/* 000001010 - Two 32-bit edge boundary processing, little-endian */
+#define EDGE32L_OPF 0x00a
+
+/* 000001011 - Two 32-bit edge boundary processing, little-endian, no CC */
+#define EDGE32LN_OPF 0x00b
+
+/* 000111110 - distance between 8 8-bit components */
+#define PDIST_OPF 0x03e
+
+/* 000010000 - convert 8-bit 3-D address to blocked byte address */
+#define ARRAY8_OPF 0x010
+
+/* 000010010 - convert 16-bit 3-D address to blocked byte address */
+#define ARRAY16_OPF 0x012
+
+/* 000010100 - convert 32-bit 3-D address to blocked byte address */
+#define ARRAY32_OPF 0x014
+
+/* 000011001 - Set the GSR.MASK field in preparation for a BSHUFFLE */
+#define BMASK_OPF 0x019
+
+/* 001001100 - Permute bytes as specified by GSR.MASK */
+#define BSHUFFLE_OPF 0x04c
+
+#define VIS_OPF_SHIFT 5
+#define VIS_OPF_MASK (0x1ff << VIS_OPF_SHIFT)
+
+#define RS1(INSN) (((INSN) >> 14) & 0x1f)
+#define RS2(INSN) (((INSN) >> 0) & 0x1f)
+#define RD(INSN) (((INSN) >> 25) & 0x1f)
+
+static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2,
+ unsigned int rd, int from_kernel)
+{
+ if (rs2 >= 16 || rs1 >= 16 || rd >= 16) {
+ if (from_kernel != 0)
+ __asm__ __volatile__("flushw");
+ else
+ flushw_user();
+ }
+}
+
+static unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
+{
+ unsigned long value, fp;
+
+ if (reg < 16)
+ return (!reg ? 0 : regs->u_regs[reg]);
+
+ fp = regs->u_regs[UREG_FP];
+
+ if (regs->tstate & TSTATE_PRIV) {
+ struct reg_window *win;
+ win = (struct reg_window *)(fp + STACK_BIAS);
+ value = win->locals[reg - 16];
+ } else if (!test_thread_64bit_stack(fp)) {
+ struct reg_window32 __user *win32;
+ win32 = (struct reg_window32 __user *)((unsigned long)((u32)fp));
+ get_user(value, &win32->locals[reg - 16]);
+ } else {
+ struct reg_window __user *win;
+ win = (struct reg_window __user *)(fp + STACK_BIAS);
+ get_user(value, &win->locals[reg - 16]);
+ }
+ return value;
+}
+
+static inline unsigned long __user *__fetch_reg_addr_user(unsigned int reg,
+ struct pt_regs *regs)
+{
+ unsigned long fp = regs->u_regs[UREG_FP];
+
+ BUG_ON(reg < 16);
+ BUG_ON(regs->tstate & TSTATE_PRIV);
+
+ if (!test_thread_64bit_stack(fp)) {
+ struct reg_window32 __user *win32;
+ win32 = (struct reg_window32 __user *)((unsigned long)((u32)fp));
+ return (unsigned long __user *)&win32->locals[reg - 16];
+ } else {
+ struct reg_window __user *win;
+ win = (struct reg_window __user *)(fp + STACK_BIAS);
+ return &win->locals[reg - 16];
+ }
+}
+
+static inline unsigned long *__fetch_reg_addr_kern(unsigned int reg,
+ struct pt_regs *regs)
+{
+ BUG_ON(reg >= 16);
+ BUG_ON(regs->tstate & TSTATE_PRIV);
+
+ return &regs->u_regs[reg];
+}
+
+static void store_reg(struct pt_regs *regs, unsigned long val, unsigned long rd)
+{
+ if (rd < 16) {
+ unsigned long *rd_kern = __fetch_reg_addr_kern(rd, regs);
+
+ *rd_kern = val;
+ } else {
+ unsigned long __user *rd_user = __fetch_reg_addr_user(rd, regs);
+
+ if (!test_thread_64bit_stack(regs->u_regs[UREG_FP]))
+ __put_user((u32)val, (u32 __user *)rd_user);
+ else
+ __put_user(val, rd_user);
+ }
+}
+
+static inline unsigned long fpd_regval(struct fpustate *f,
+ unsigned int insn_regnum)
+{
+ insn_regnum = (((insn_regnum & 1) << 5) |
+ (insn_regnum & 0x1e));
+
+ return *(unsigned long *) &f->regs[insn_regnum];
+}
+
+static inline unsigned long *fpd_regaddr(struct fpustate *f,
+ unsigned int insn_regnum)
+{
+ insn_regnum = (((insn_regnum & 1) << 5) |
+ (insn_regnum & 0x1e));
+
+ return (unsigned long *) &f->regs[insn_regnum];
+}
+
+static inline unsigned int fps_regval(struct fpustate *f,
+ unsigned int insn_regnum)
+{
+ return f->regs[insn_regnum];
+}
+
+static inline unsigned int *fps_regaddr(struct fpustate *f,
+ unsigned int insn_regnum)
+{
+ return &f->regs[insn_regnum];
+}
+
+struct edge_tab {
+ u16 left, right;
+};
+static struct edge_tab edge8_tab[8] = {
+ { 0xff, 0x80 },
+ { 0x7f, 0xc0 },
+ { 0x3f, 0xe0 },
+ { 0x1f, 0xf0 },
+ { 0x0f, 0xf8 },
+ { 0x07, 0xfc },
+ { 0x03, 0xfe },
+ { 0x01, 0xff },
+};
+static struct edge_tab edge8_tab_l[8] = {
+ { 0xff, 0x01 },
+ { 0xfe, 0x03 },
+ { 0xfc, 0x07 },
+ { 0xf8, 0x0f },
+ { 0xf0, 0x1f },
+ { 0xe0, 0x3f },
+ { 0xc0, 0x7f },
+ { 0x80, 0xff },
+};
+static struct edge_tab edge16_tab[4] = {
+ { 0xf, 0x8 },
+ { 0x7, 0xc },
+ { 0x3, 0xe },
+ { 0x1, 0xf },
+};
+static struct edge_tab edge16_tab_l[4] = {
+ { 0xf, 0x1 },
+ { 0xe, 0x3 },
+ { 0xc, 0x7 },
+ { 0x8, 0xf },
+};
+static struct edge_tab edge32_tab[2] = {
+ { 0x3, 0x2 },
+ { 0x1, 0x3 },
+};
+static struct edge_tab edge32_tab_l[2] = {
+ { 0x3, 0x1 },
+ { 0x2, 0x3 },
+};
+
+static void edge(struct pt_regs *regs, unsigned int insn, unsigned int opf)
+{
+ unsigned long orig_rs1, rs1, orig_rs2, rs2, rd_val;
+ u16 left, right;
+
+ maybe_flush_windows(RS1(insn), RS2(insn), RD(insn), 0);
+ orig_rs1 = rs1 = fetch_reg(RS1(insn), regs);
+ orig_rs2 = rs2 = fetch_reg(RS2(insn), regs);
+
+ if (test_thread_flag(TIF_32BIT)) {
+ rs1 = rs1 & 0xffffffff;
+ rs2 = rs2 & 0xffffffff;
+ }
+ switch (opf) {
+ default:
+ case EDGE8_OPF:
+ case EDGE8N_OPF:
+ left = edge8_tab[rs1 & 0x7].left;
+ right = edge8_tab[rs2 & 0x7].right;
+ break;
+ case EDGE8L_OPF:
+ case EDGE8LN_OPF:
+ left = edge8_tab_l[rs1 & 0x7].left;
+ right = edge8_tab_l[rs2 & 0x7].right;
+ break;
+
+ case EDGE16_OPF:
+ case EDGE16N_OPF:
+ left = edge16_tab[(rs1 >> 1) & 0x3].left;
+ right = edge16_tab[(rs2 >> 1) & 0x3].right;
+ break;
+
+ case EDGE16L_OPF:
+ case EDGE16LN_OPF:
+ left = edge16_tab_l[(rs1 >> 1) & 0x3].left;
+ right = edge16_tab_l[(rs2 >> 1) & 0x3].right;
+ break;
+
+ case EDGE32_OPF:
+ case EDGE32N_OPF:
+ left = edge32_tab[(rs1 >> 2) & 0x1].left;
+ right = edge32_tab[(rs2 >> 2) & 0x1].right;
+ break;
+
+ case EDGE32L_OPF:
+ case EDGE32LN_OPF:
+ left = edge32_tab_l[(rs1 >> 2) & 0x1].left;
+ right = edge32_tab_l[(rs2 >> 2) & 0x1].right;
+ break;
+ }
+
+ if ((rs1 & ~0x7UL) == (rs2 & ~0x7UL))
+ rd_val = right & left;
+ else
+ rd_val = left;
+
+ store_reg(regs, rd_val, RD(insn));
+
+ switch (opf) {
+ case EDGE8_OPF:
+ case EDGE8L_OPF:
+ case EDGE16_OPF:
+ case EDGE16L_OPF:
+ case EDGE32_OPF:
+ case EDGE32L_OPF: {
+ unsigned long ccr, tstate;
+
+ __asm__ __volatile__("subcc %1, %2, %%g0\n\t"
+ "rd %%ccr, %0"
+ : "=r" (ccr)
+ : "r" (orig_rs1), "r" (orig_rs2)
+ : "cc");
+ tstate = regs->tstate & ~(TSTATE_XCC | TSTATE_ICC);
+ regs->tstate = tstate | (ccr << 32UL);
+ }
+ }
+}
+
+static void array(struct pt_regs *regs, unsigned int insn, unsigned int opf)
+{
+ unsigned long rs1, rs2, rd_val;
+ unsigned int bits, bits_mask;
+
+ maybe_flush_windows(RS1(insn), RS2(insn), RD(insn), 0);
+ rs1 = fetch_reg(RS1(insn), regs);
+ rs2 = fetch_reg(RS2(insn), regs);
+
+ bits = (rs2 > 5 ? 5 : rs2);
+ bits_mask = (1UL << bits) - 1UL;
+
+ rd_val = ((((rs1 >> 11) & 0x3) << 0) |
+ (((rs1 >> 33) & 0x3) << 2) |
+ (((rs1 >> 55) & 0x1) << 4) |
+ (((rs1 >> 13) & 0xf) << 5) |
+ (((rs1 >> 35) & 0xf) << 9) |
+ (((rs1 >> 56) & 0xf) << 13) |
+ (((rs1 >> 17) & bits_mask) << 17) |
+ (((rs1 >> 39) & bits_mask) << (17 + bits)) |
+ (((rs1 >> 60) & 0xf) << (17 + (2*bits))));
+
+ switch (opf) {
+ case ARRAY16_OPF:
+ rd_val <<= 1;
+ break;
+
+ case ARRAY32_OPF:
+ rd_val <<= 2;
+ }
+
+ store_reg(regs, rd_val, RD(insn));
+}
+
+static void bmask(struct pt_regs *regs, unsigned int insn)
+{
+ unsigned long rs1, rs2, rd_val, gsr;
+
+ maybe_flush_windows(RS1(insn), RS2(insn), RD(insn), 0);
+ rs1 = fetch_reg(RS1(insn), regs);
+ rs2 = fetch_reg(RS2(insn), regs);
+ rd_val = rs1 + rs2;
+
+ store_reg(regs, rd_val, RD(insn));
+
+ gsr = current_thread_info()->gsr[0] & 0xffffffff;
+ gsr |= rd_val << 32UL;
+ current_thread_info()->gsr[0] = gsr;
+}
+
+static void bshuffle(struct pt_regs *regs, unsigned int insn)
+{
+ struct fpustate *f = FPUSTATE;
+ unsigned long rs1, rs2, rd_val;
+ unsigned long bmask, i;
+
+ bmask = current_thread_info()->gsr[0] >> 32UL;
+
+ rs1 = fpd_regval(f, RS1(insn));
+ rs2 = fpd_regval(f, RS2(insn));
+
+ rd_val = 0UL;
+ for (i = 0; i < 8; i++) {
+ unsigned long which = (bmask >> (i * 4)) & 0xf;
+ unsigned long byte;
+
+ if (which < 8)
+ byte = (rs1 >> (which * 8)) & 0xff;
+ else
+ byte = (rs2 >> ((which-8)*8)) & 0xff;
+ rd_val |= (byte << (i * 8));
+ }
+
+ *fpd_regaddr(f, RD(insn)) = rd_val;
+}
+
+static void pdist(struct pt_regs *regs, unsigned int insn)
+{
+ struct fpustate *f = FPUSTATE;
+ unsigned long rs1, rs2, *rd, rd_val;
+ unsigned long i;
+
+ rs1 = fpd_regval(f, RS1(insn));
+ rs2 = fpd_regval(f, RS2(insn));
+ rd = fpd_regaddr(f, RD(insn));
+
+ rd_val = *rd;
+
+ for (i = 0; i < 8; i++) {
+ s16 s1, s2;
+
+ s1 = (rs1 >> (56 - (i * 8))) & 0xff;
+ s2 = (rs2 >> (56 - (i * 8))) & 0xff;
+
+ /* Absolute value of difference. */
+ s1 -= s2;
+ if (s1 < 0)
+ s1 = ~s1 + 1;
+
+ rd_val += s1;
+ }
+
+ *rd = rd_val;
+}
+
+static void pformat(struct pt_regs *regs, unsigned int insn, unsigned int opf)
+{
+ struct fpustate *f = FPUSTATE;
+ unsigned long rs1, rs2, gsr, scale, rd_val;
+
+ gsr = current_thread_info()->gsr[0];
+ scale = (gsr >> 3) & (opf == FPACK16_OPF ? 0xf : 0x1f);
+ switch (opf) {
+ case FPACK16_OPF: {
+ unsigned long byte;
+
+ rs2 = fpd_regval(f, RS2(insn));
+ rd_val = 0;
+ for (byte = 0; byte < 4; byte++) {
+ unsigned int val;
+ s16 src = (rs2 >> (byte * 16UL)) & 0xffffUL;
+ int scaled = src << scale;
+ int from_fixed = scaled >> 7;
+
+ val = ((from_fixed < 0) ?
+ 0 :
+ (from_fixed > 255) ?
+ 255 : from_fixed);
+
+ rd_val |= (val << (8 * byte));
+ }
+ *fps_regaddr(f, RD(insn)) = rd_val;
+ break;
+ }
+
+ case FPACK32_OPF: {
+ unsigned long word;
+
+ rs1 = fpd_regval(f, RS1(insn));
+ rs2 = fpd_regval(f, RS2(insn));
+ rd_val = (rs1 << 8) & ~(0x000000ff000000ffUL);
+ for (word = 0; word < 2; word++) {
+ unsigned long val;
+ s32 src = (rs2 >> (word * 32UL));
+ s64 scaled = src << scale;
+ s64 from_fixed = scaled >> 23;
+
+ val = ((from_fixed < 0) ?
+ 0 :
+ (from_fixed > 255) ?
+ 255 : from_fixed);
+
+ rd_val |= (val << (32 * word));
+ }
+ *fpd_regaddr(f, RD(insn)) = rd_val;
+ break;
+ }
+
+ case FPACKFIX_OPF: {
+ unsigned long word;
+
+ rs2 = fpd_regval(f, RS2(insn));
+
+ rd_val = 0;
+ for (word = 0; word < 2; word++) {
+ long val;
+ s32 src = (rs2 >> (word * 32UL));
+ s64 scaled = src << scale;
+ s64 from_fixed = scaled >> 16;
+
+ val = ((from_fixed < -32768) ?
+ -32768 :
+ (from_fixed > 32767) ?
+ 32767 : from_fixed);
+
+ rd_val |= ((val & 0xffff) << (word * 16));
+ }
+ *fps_regaddr(f, RD(insn)) = rd_val;
+ break;
+ }
+
+ case FEXPAND_OPF: {
+ unsigned long byte;
+
+ rs2 = fps_regval(f, RS2(insn));
+
+ rd_val = 0;
+ for (byte = 0; byte < 4; byte++) {
+ unsigned long val;
+ u8 src = (rs2 >> (byte * 8)) & 0xff;
+
+ val = src << 4;
+
+ rd_val |= (val << (byte * 16));
+ }
+ *fpd_regaddr(f, RD(insn)) = rd_val;
+ break;
+ }
+
+ case FPMERGE_OPF: {
+ rs1 = fps_regval(f, RS1(insn));
+ rs2 = fps_regval(f, RS2(insn));
+
+ rd_val = (((rs2 & 0x000000ff) << 0) |
+ ((rs1 & 0x000000ff) << 8) |
+ ((rs2 & 0x0000ff00) << 8) |
+ ((rs1 & 0x0000ff00) << 16) |
+ ((rs2 & 0x00ff0000) << 16) |
+ ((rs1 & 0x00ff0000) << 24) |
+ ((rs2 & 0xff000000) << 24) |
+ ((rs1 & 0xff000000) << 32));
+ *fpd_regaddr(f, RD(insn)) = rd_val;
+ break;
+ }
+ }
+}
+
+static void pmul(struct pt_regs *regs, unsigned int insn, unsigned int opf)
+{
+ struct fpustate *f = FPUSTATE;
+ unsigned long rs1, rs2, rd_val;
+
+ switch (opf) {
+ case FMUL8x16_OPF: {
+ unsigned long byte;
+
+ rs1 = fps_regval(f, RS1(insn));
+ rs2 = fpd_regval(f, RS2(insn));
+
+ rd_val = 0;
+ for (byte = 0; byte < 4; byte++) {
+ u16 src1 = (rs1 >> (byte * 8)) & 0x00ff;
+ s16 src2 = (rs2 >> (byte * 16)) & 0xffff;
+ u32 prod = src1 * src2;
+ u16 scaled = ((prod & 0x00ffff00) >> 8);
+
+ /* Round up. */
+ if (prod & 0x80)
+ scaled++;
+ rd_val |= ((scaled & 0xffffUL) << (byte * 16UL));
+ }
+
+ *fpd_regaddr(f, RD(insn)) = rd_val;
+ break;
+ }
+
+ case FMUL8x16AU_OPF:
+ case FMUL8x16AL_OPF: {
+ unsigned long byte;
+ s16 src2;
+
+ rs1 = fps_regval(f, RS1(insn));
+ rs2 = fps_regval(f, RS2(insn));
+
+ rd_val = 0;
+ src2 = rs2 >> (opf == FMUL8x16AU_OPF ? 16 : 0);
+ for (byte = 0; byte < 4; byte++) {
+ u16 src1 = (rs1 >> (byte * 8)) & 0x00ff;
+ u32 prod = src1 * src2;
+ u16 scaled = ((prod & 0x00ffff00) >> 8);
+
+ /* Round up. */
+ if (prod & 0x80)
+ scaled++;
+ rd_val |= ((scaled & 0xffffUL) << (byte * 16UL));
+ }
+
+ *fpd_regaddr(f, RD(insn)) = rd_val;
+ break;
+ }
+
+ case FMUL8SUx16_OPF:
+ case FMUL8ULx16_OPF: {
+ unsigned long byte, ushift;
+
+ rs1 = fpd_regval(f, RS1(insn));
+ rs2 = fpd_regval(f, RS2(insn));
+
+ rd_val = 0;
+ ushift = (opf == FMUL8SUx16_OPF) ? 8 : 0;
+ for (byte = 0; byte < 4; byte++) {
+ u16 src1;
+ s16 src2;
+ u32 prod;
+ u16 scaled;
+
+ src1 = ((rs1 >> ((16 * byte) + ushift)) & 0x00ff);
+ src2 = ((rs2 >> (16 * byte)) & 0xffff);
+ prod = src1 * src2;
+ scaled = ((prod & 0x00ffff00) >> 8);
+
+ /* Round up. */
+ if (prod & 0x80)
+ scaled++;
+ rd_val |= ((scaled & 0xffffUL) << (byte * 16UL));
+ }
+
+ *fpd_regaddr(f, RD(insn)) = rd_val;
+ break;
+ }
+
+ case FMULD8SUx16_OPF:
+ case FMULD8ULx16_OPF: {
+ unsigned long byte, ushift;
+
+ rs1 = fps_regval(f, RS1(insn));
+ rs2 = fps_regval(f, RS2(insn));
+
+ rd_val = 0;
+ ushift = (opf == FMULD8SUx16_OPF) ? 8 : 0;
+ for (byte = 0; byte < 2; byte++) {
+ u16 src1;
+ s16 src2;
+ u32 prod;
+ u16 scaled;
+
+ src1 = ((rs1 >> ((16 * byte) + ushift)) & 0x00ff);
+ src2 = ((rs2 >> (16 * byte)) & 0xffff);
+ prod = src1 * src2;
+ scaled = ((prod & 0x00ffff00) >> 8);
+
+ /* Round up. */
+ if (prod & 0x80)
+ scaled++;
+ rd_val |= ((scaled & 0xffffUL) <<
+ ((byte * 32UL) + 7UL));
+ }
+ *fpd_regaddr(f, RD(insn)) = rd_val;
+ break;
+ }
+ }
+}
+
+static void pcmp(struct pt_regs *regs, unsigned int insn, unsigned int opf)
+{
+ struct fpustate *f = FPUSTATE;
+ unsigned long rs1, rs2, rd_val, i;
+
+ rs1 = fpd_regval(f, RS1(insn));
+ rs2 = fpd_regval(f, RS2(insn));
+
+ rd_val = 0;
+
+ switch (opf) {
+ case FCMPGT16_OPF:
+ for (i = 0; i < 4; i++) {
+ s16 a = (rs1 >> (i * 16)) & 0xffff;
+ s16 b = (rs2 >> (i * 16)) & 0xffff;
+
+ if (a > b)
+ rd_val |= 8 >> i;
+ }
+ break;
+
+ case FCMPGT32_OPF:
+ for (i = 0; i < 2; i++) {
+ s32 a = (rs1 >> (i * 32)) & 0xffffffff;
+ s32 b = (rs2 >> (i * 32)) & 0xffffffff;
+
+ if (a > b)
+ rd_val |= 2 >> i;
+ }
+ break;
+
+ case FCMPLE16_OPF:
+ for (i = 0; i < 4; i++) {
+ s16 a = (rs1 >> (i * 16)) & 0xffff;
+ s16 b = (rs2 >> (i * 16)) & 0xffff;
+
+ if (a <= b)
+ rd_val |= 8 >> i;
+ }
+ break;
+
+ case FCMPLE32_OPF:
+ for (i = 0; i < 2; i++) {
+ s32 a = (rs1 >> (i * 32)) & 0xffffffff;
+ s32 b = (rs2 >> (i * 32)) & 0xffffffff;
+
+ if (a <= b)
+ rd_val |= 2 >> i;
+ }
+ break;
+
+ case FCMPNE16_OPF:
+ for (i = 0; i < 4; i++) {
+ s16 a = (rs1 >> (i * 16)) & 0xffff;
+ s16 b = (rs2 >> (i * 16)) & 0xffff;
+
+ if (a != b)
+ rd_val |= 8 >> i;
+ }
+ break;
+
+ case FCMPNE32_OPF:
+ for (i = 0; i < 2; i++) {
+ s32 a = (rs1 >> (i * 32)) & 0xffffffff;
+ s32 b = (rs2 >> (i * 32)) & 0xffffffff;
+
+ if (a != b)
+ rd_val |= 2 >> i;
+ }
+ break;
+
+ case FCMPEQ16_OPF:
+ for (i = 0; i < 4; i++) {
+ s16 a = (rs1 >> (i * 16)) & 0xffff;
+ s16 b = (rs2 >> (i * 16)) & 0xffff;
+
+ if (a == b)
+ rd_val |= 8 >> i;
+ }
+ break;
+
+ case FCMPEQ32_OPF:
+ for (i = 0; i < 2; i++) {
+ s32 a = (rs1 >> (i * 32)) & 0xffffffff;
+ s32 b = (rs2 >> (i * 32)) & 0xffffffff;
+
+ if (a == b)
+ rd_val |= 2 >> i;
+ }
+ break;
+ }
+
+ maybe_flush_windows(0, 0, RD(insn), 0);
+ store_reg(regs, rd_val, RD(insn));
+}
+
+/* Emulate the VIS instructions which are not implemented in
+ * hardware on Niagara.
+ */
+int vis_emul(struct pt_regs *regs, unsigned int insn)
+{
+ unsigned long pc = regs->tpc;
+ unsigned int opf;
+
+ BUG_ON(regs->tstate & TSTATE_PRIV);
+
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, 0);
+
+ if (test_thread_flag(TIF_32BIT))
+ pc = (u32)pc;
+
+ if (get_user(insn, (u32 __user *) pc))
+ return -EFAULT;
+
+ save_and_clear_fpu();
+
+ opf = (insn & VIS_OPF_MASK) >> VIS_OPF_SHIFT;
+ switch (opf) {
+ default:
+ return -EINVAL;
+
+ /* Pixel Formatting Instructions. */
+ case FPACK16_OPF:
+ case FPACK32_OPF:
+ case FPACKFIX_OPF:
+ case FEXPAND_OPF:
+ case FPMERGE_OPF:
+ pformat(regs, insn, opf);
+ break;
+
+ /* Partitioned Multiply Instructions */
+ case FMUL8x16_OPF:
+ case FMUL8x16AU_OPF:
+ case FMUL8x16AL_OPF:
+ case FMUL8SUx16_OPF:
+ case FMUL8ULx16_OPF:
+ case FMULD8SUx16_OPF:
+ case FMULD8ULx16_OPF:
+ pmul(regs, insn, opf);
+ break;
+
+ /* Pixel Compare Instructions */
+ case FCMPGT16_OPF:
+ case FCMPGT32_OPF:
+ case FCMPLE16_OPF:
+ case FCMPLE32_OPF:
+ case FCMPNE16_OPF:
+ case FCMPNE32_OPF:
+ case FCMPEQ16_OPF:
+ case FCMPEQ32_OPF:
+ pcmp(regs, insn, opf);
+ break;
+
+ /* Edge Handling Instructions */
+ case EDGE8_OPF:
+ case EDGE8N_OPF:
+ case EDGE8L_OPF:
+ case EDGE8LN_OPF:
+ case EDGE16_OPF:
+ case EDGE16N_OPF:
+ case EDGE16L_OPF:
+ case EDGE16LN_OPF:
+ case EDGE32_OPF:
+ case EDGE32N_OPF:
+ case EDGE32L_OPF:
+ case EDGE32LN_OPF:
+ edge(regs, insn, opf);
+ break;
+
+ /* Pixel Component Distance */
+ case PDIST_OPF:
+ pdist(regs, insn);
+ break;
+
+ /* Three-Dimensional Array Addressing Instructions */
+ case ARRAY8_OPF:
+ case ARRAY16_OPF:
+ case ARRAY32_OPF:
+ array(regs, insn, opf);
+ break;
+
+ /* Byte Mask and Shuffle Instructions */
+ case BMASK_OPF:
+ bmask(regs, insn);
+ break;
+
+ case BSHUFFLE_OPF:
+ bshuffle(regs, insn);
+ break;
+ }
+
+ regs->tpc = regs->tnpc;
+ regs->tnpc += 4;
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 04:11:13 +0000