summaryrefslogtreecommitdiff
path: root/arch/sparc/lib/copy_user.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/lib/copy_user.S')
-rw-r--r--arch/sparc/lib/copy_user.S492
1 files changed, 492 insertions, 0 deletions
diff --git a/arch/sparc/lib/copy_user.S b/arch/sparc/lib/copy_user.S
new file mode 100644
index 00000000000..577505b692a
--- /dev/null
+++ b/arch/sparc/lib/copy_user.S
@@ -0,0 +1,492 @@
+/* copy_user.S: Sparc optimized copy_from_user and copy_to_user code.
+ *
+ * Copyright(C) 1995 Linus Torvalds
+ * Copyright(C) 1996 David S. Miller
+ * Copyright(C) 1996 Eddie C. Dost
+ * Copyright(C) 1996,1998 Jakub Jelinek
+ *
+ * derived from:
+ * e-mail between David and Eddie.
+ *
+ * Returns 0 if successful, otherwise count of bytes not copied yet
+ */
+
+#include <asm/ptrace.h>
+#include <asm/asmmacro.h>
+#include <asm/page.h>
+
+/* Work around cpp -rob */
+#define ALLOC #alloc
+#define EXECINSTR #execinstr
+#define EX(x,y,a,b) \
+98: x,y; \
+ .section .fixup,ALLOC,EXECINSTR; \
+ .align 4; \
+99: ba fixupretl; \
+ a, b, %g3; \
+ .section __ex_table,ALLOC; \
+ .align 4; \
+ .word 98b, 99b; \
+ .text; \
+ .align 4
+
+#define EX2(x,y,c,d,e,a,b) \
+98: x,y; \
+ .section .fixup,ALLOC,EXECINSTR; \
+ .align 4; \
+99: c, d, e; \
+ ba fixupretl; \
+ a, b, %g3; \
+ .section __ex_table,ALLOC; \
+ .align 4; \
+ .word 98b, 99b; \
+ .text; \
+ .align 4
+
+#define EXO2(x,y) \
+98: x, y; \
+ .section __ex_table,ALLOC; \
+ .align 4; \
+ .word 98b, 97f; \
+ .text; \
+ .align 4
+
+#define EXT(start,end,handler) \
+ .section __ex_table,ALLOC; \
+ .align 4; \
+ .word start, 0, end, handler; \
+ .text; \
+ .align 4
+
+/* Please do not change following macros unless you change logic used
+ * in .fixup at the end of this file as well
+ */
+
+/* Both these macros have to start with exactly the same insn */
+#define MOVE_BIGCHUNK(src, dst, offset, t0, t1, t2, t3, t4, t5, t6, t7) \
+ ldd [%src + (offset) + 0x00], %t0; \
+ ldd [%src + (offset) + 0x08], %t2; \
+ ldd [%src + (offset) + 0x10], %t4; \
+ ldd [%src + (offset) + 0x18], %t6; \
+ st %t0, [%dst + (offset) + 0x00]; \
+ st %t1, [%dst + (offset) + 0x04]; \
+ st %t2, [%dst + (offset) + 0x08]; \
+ st %t3, [%dst + (offset) + 0x0c]; \
+ st %t4, [%dst + (offset) + 0x10]; \
+ st %t5, [%dst + (offset) + 0x14]; \
+ st %t6, [%dst + (offset) + 0x18]; \
+ st %t7, [%dst + (offset) + 0x1c];
+
+#define MOVE_BIGALIGNCHUNK(src, dst, offset, t0, t1, t2, t3, t4, t5, t6, t7) \
+ ldd [%src + (offset) + 0x00], %t0; \
+ ldd [%src + (offset) + 0x08], %t2; \
+ ldd [%src + (offset) + 0x10], %t4; \
+ ldd [%src + (offset) + 0x18], %t6; \
+ std %t0, [%dst + (offset) + 0x00]; \
+ std %t2, [%dst + (offset) + 0x08]; \
+ std %t4, [%dst + (offset) + 0x10]; \
+ std %t6, [%dst + (offset) + 0x18];
+
+#define MOVE_LASTCHUNK(src, dst, offset, t0, t1, t2, t3) \
+ ldd [%src - (offset) - 0x10], %t0; \
+ ldd [%src - (offset) - 0x08], %t2; \
+ st %t0, [%dst - (offset) - 0x10]; \
+ st %t1, [%dst - (offset) - 0x0c]; \
+ st %t2, [%dst - (offset) - 0x08]; \
+ st %t3, [%dst - (offset) - 0x04];
+
+#define MOVE_HALFCHUNK(src, dst, offset, t0, t1, t2, t3) \
+ lduh [%src + (offset) + 0x00], %t0; \
+ lduh [%src + (offset) + 0x02], %t1; \
+ lduh [%src + (offset) + 0x04], %t2; \
+ lduh [%src + (offset) + 0x06], %t3; \
+ sth %t0, [%dst + (offset) + 0x00]; \
+ sth %t1, [%dst + (offset) + 0x02]; \
+ sth %t2, [%dst + (offset) + 0x04]; \
+ sth %t3, [%dst + (offset) + 0x06];
+
+#define MOVE_SHORTCHUNK(src, dst, offset, t0, t1) \
+ ldub [%src - (offset) - 0x02], %t0; \
+ ldub [%src - (offset) - 0x01], %t1; \
+ stb %t0, [%dst - (offset) - 0x02]; \
+ stb %t1, [%dst - (offset) - 0x01];
+
+ .text
+ .align 4
+
+ .globl __copy_user_begin
+__copy_user_begin:
+
+ .globl __copy_user
+dword_align:
+ andcc %o1, 1, %g0
+ be 4f
+ andcc %o1, 2, %g0
+
+ EXO2(ldub [%o1], %g2)
+ add %o1, 1, %o1
+ EXO2(stb %g2, [%o0])
+ sub %o2, 1, %o2
+ bne 3f
+ add %o0, 1, %o0
+
+ EXO2(lduh [%o1], %g2)
+ add %o1, 2, %o1
+ EXO2(sth %g2, [%o0])
+ sub %o2, 2, %o2
+ b 3f
+ add %o0, 2, %o0
+4:
+ EXO2(lduh [%o1], %g2)
+ add %o1, 2, %o1
+ EXO2(sth %g2, [%o0])
+ sub %o2, 2, %o2
+ b 3f
+ add %o0, 2, %o0
+
+__copy_user: /* %o0=dst %o1=src %o2=len */
+ xor %o0, %o1, %o4
+1:
+ andcc %o4, 3, %o5
+2:
+ bne cannot_optimize
+ cmp %o2, 15
+
+ bleu short_aligned_end
+ andcc %o1, 3, %g0
+
+ bne dword_align
+3:
+ andcc %o1, 4, %g0
+
+ be 2f
+ mov %o2, %g1
+
+ EXO2(ld [%o1], %o4)
+ sub %g1, 4, %g1
+ EXO2(st %o4, [%o0])
+ add %o1, 4, %o1
+ add %o0, 4, %o0
+2:
+ andcc %g1, 0xffffff80, %g7
+ be 3f
+ andcc %o0, 4, %g0
+
+ be ldd_std + 4
+5:
+ MOVE_BIGCHUNK(o1, o0, 0x00, o2, o3, o4, o5, g2, g3, g4, g5)
+ MOVE_BIGCHUNK(o1, o0, 0x20, o2, o3, o4, o5, g2, g3, g4, g5)
+ MOVE_BIGCHUNK(o1, o0, 0x40, o2, o3, o4, o5, g2, g3, g4, g5)
+ MOVE_BIGCHUNK(o1, o0, 0x60, o2, o3, o4, o5, g2, g3, g4, g5)
+80:
+ EXT(5b, 80b, 50f)
+ subcc %g7, 128, %g7
+ add %o1, 128, %o1
+ bne 5b
+ add %o0, 128, %o0
+3:
+ andcc %g1, 0x70, %g7
+ be copy_user_table_end
+ andcc %g1, 8, %g0
+
+ sethi %hi(copy_user_table_end), %o5
+ srl %g7, 1, %o4
+ add %g7, %o4, %o4
+ add %o1, %g7, %o1
+ sub %o5, %o4, %o5
+ jmpl %o5 + %lo(copy_user_table_end), %g0
+ add %o0, %g7, %o0
+
+copy_user_table:
+ MOVE_LASTCHUNK(o1, o0, 0x60, g2, g3, g4, g5)
+ MOVE_LASTCHUNK(o1, o0, 0x50, g2, g3, g4, g5)
+ MOVE_LASTCHUNK(o1, o0, 0x40, g2, g3, g4, g5)
+ MOVE_LASTCHUNK(o1, o0, 0x30, g2, g3, g4, g5)
+ MOVE_LASTCHUNK(o1, o0, 0x20, g2, g3, g4, g5)
+ MOVE_LASTCHUNK(o1, o0, 0x10, g2, g3, g4, g5)
+ MOVE_LASTCHUNK(o1, o0, 0x00, g2, g3, g4, g5)
+copy_user_table_end:
+ EXT(copy_user_table, copy_user_table_end, 51f)
+ be copy_user_last7
+ andcc %g1, 4, %g0
+
+ EX(ldd [%o1], %g2, and %g1, 0xf)
+ add %o0, 8, %o0
+ add %o1, 8, %o1
+ EX(st %g2, [%o0 - 0x08], and %g1, 0xf)
+ EX2(st %g3, [%o0 - 0x04], and %g1, 0xf, %g1, sub %g1, 4)
+copy_user_last7:
+ be 1f
+ andcc %g1, 2, %g0
+
+ EX(ld [%o1], %g2, and %g1, 7)
+ add %o1, 4, %o1
+ EX(st %g2, [%o0], and %g1, 7)
+ add %o0, 4, %o0
+1:
+ be 1f
+ andcc %g1, 1, %g0
+
+ EX(lduh [%o1], %g2, and %g1, 3)
+ add %o1, 2, %o1
+ EX(sth %g2, [%o0], and %g1, 3)
+ add %o0, 2, %o0
+1:
+ be 1f
+ nop
+
+ EX(ldub [%o1], %g2, add %g0, 1)
+ EX(stb %g2, [%o0], add %g0, 1)
+1:
+ retl
+ clr %o0
+
+ldd_std:
+ MOVE_BIGALIGNCHUNK(o1, o0, 0x00, o2, o3, o4, o5, g2, g3, g4, g5)
+ MOVE_BIGALIGNCHUNK(o1, o0, 0x20, o2, o3, o4, o5, g2, g3, g4, g5)
+ MOVE_BIGALIGNCHUNK(o1, o0, 0x40, o2, o3, o4, o5, g2, g3, g4, g5)
+ MOVE_BIGALIGNCHUNK(o1, o0, 0x60, o2, o3, o4, o5, g2, g3, g4, g5)
+81:
+ EXT(ldd_std, 81b, 52f)
+ subcc %g7, 128, %g7
+ add %o1, 128, %o1
+ bne ldd_std
+ add %o0, 128, %o0
+
+ andcc %g1, 0x70, %g7
+ be copy_user_table_end
+ andcc %g1, 8, %g0
+
+ sethi %hi(copy_user_table_end), %o5
+ srl %g7, 1, %o4
+ add %g7, %o4, %o4
+ add %o1, %g7, %o1
+ sub %o5, %o4, %o5
+ jmpl %o5 + %lo(copy_user_table_end), %g0
+ add %o0, %g7, %o0
+
+cannot_optimize:
+ bleu short_end
+ cmp %o5, 2
+
+ bne byte_chunk
+ and %o2, 0xfffffff0, %o3
+
+ andcc %o1, 1, %g0
+ be 10f
+ nop
+
+ EXO2(ldub [%o1], %g2)
+ add %o1, 1, %o1
+ EXO2(stb %g2, [%o0])
+ sub %o2, 1, %o2
+ andcc %o2, 0xfffffff0, %o3
+ be short_end
+ add %o0, 1, %o0
+10:
+ MOVE_HALFCHUNK(o1, o0, 0x00, g2, g3, g4, g5)
+ MOVE_HALFCHUNK(o1, o0, 0x08, g2, g3, g4, g5)
+82:
+ EXT(10b, 82b, 53f)
+ subcc %o3, 0x10, %o3
+ add %o1, 0x10, %o1
+ bne 10b
+ add %o0, 0x10, %o0
+ b 2f
+ and %o2, 0xe, %o3
+
+byte_chunk:
+ MOVE_SHORTCHUNK(o1, o0, -0x02, g2, g3)
+ MOVE_SHORTCHUNK(o1, o0, -0x04, g2, g3)
+ MOVE_SHORTCHUNK(o1, o0, -0x06, g2, g3)
+ MOVE_SHORTCHUNK(o1, o0, -0x08, g2, g3)
+ MOVE_SHORTCHUNK(o1, o0, -0x0a, g2, g3)
+ MOVE_SHORTCHUNK(o1, o0, -0x0c, g2, g3)
+ MOVE_SHORTCHUNK(o1, o0, -0x0e, g2, g3)
+ MOVE_SHORTCHUNK(o1, o0, -0x10, g2, g3)
+83:
+ EXT(byte_chunk, 83b, 54f)
+ subcc %o3, 0x10, %o3
+ add %o1, 0x10, %o1
+ bne byte_chunk
+ add %o0, 0x10, %o0
+
+short_end:
+ and %o2, 0xe, %o3
+2:
+ sethi %hi(short_table_end), %o5
+ sll %o3, 3, %o4
+ add %o0, %o3, %o0
+ sub %o5, %o4, %o5
+ add %o1, %o3, %o1
+ jmpl %o5 + %lo(short_table_end), %g0
+ andcc %o2, 1, %g0
+84:
+ MOVE_SHORTCHUNK(o1, o0, 0x0c, g2, g3)
+ MOVE_SHORTCHUNK(o1, o0, 0x0a, g2, g3)
+ MOVE_SHORTCHUNK(o1, o0, 0x08, g2, g3)
+ MOVE_SHORTCHUNK(o1, o0, 0x06, g2, g3)
+ MOVE_SHORTCHUNK(o1, o0, 0x04, g2, g3)
+ MOVE_SHORTCHUNK(o1, o0, 0x02, g2, g3)
+ MOVE_SHORTCHUNK(o1, o0, 0x00, g2, g3)
+short_table_end:
+ EXT(84b, short_table_end, 55f)
+ be 1f
+ nop
+ EX(ldub [%o1], %g2, add %g0, 1)
+ EX(stb %g2, [%o0], add %g0, 1)
+1:
+ retl
+ clr %o0
+
+short_aligned_end:
+ bne short_end
+ andcc %o2, 8, %g0
+
+ be 1f
+ andcc %o2, 4, %g0
+
+ EXO2(ld [%o1 + 0x00], %g2)
+ EXO2(ld [%o1 + 0x04], %g3)
+ add %o1, 8, %o1
+ EXO2(st %g2, [%o0 + 0x00])
+ EX(st %g3, [%o0 + 0x04], sub %o2, 4)
+ add %o0, 8, %o0
+1:
+ b copy_user_last7
+ mov %o2, %g1
+
+ .section .fixup,#alloc,#execinstr
+ .align 4
+97:
+ mov %o2, %g3
+fixupretl:
+ sethi %hi(PAGE_OFFSET), %g1
+ cmp %o0, %g1
+ blu 1f
+ cmp %o1, %g1
+ bgeu 1f
+ nop
+ save %sp, -64, %sp
+ mov %i0, %o0
+ call __bzero
+ mov %g3, %o1
+ restore
+1: retl
+ mov %g3, %o0
+
+/* exception routine sets %g2 to (broken_insn - first_insn)>>2 */
+50:
+/* This magic counts how many bytes are left when crash in MOVE_BIGCHUNK
+ * happens. This is derived from the amount ldd reads, st stores, etc.
+ * x = g2 % 12;
+ * g3 = g1 + g7 - ((g2 / 12) * 32 + (x < 4) ? 0 : (x - 4) * 4);
+ * o0 += (g2 / 12) * 32;
+ */
+ cmp %g2, 12
+ add %o0, %g7, %o0
+ bcs 1f
+ cmp %g2, 24
+ bcs 2f
+ cmp %g2, 36
+ bcs 3f
+ nop
+ sub %g2, 12, %g2
+ sub %g7, 32, %g7
+3: sub %g2, 12, %g2
+ sub %g7, 32, %g7
+2: sub %g2, 12, %g2
+ sub %g7, 32, %g7
+1: cmp %g2, 4
+ bcs,a 60f
+ clr %g2
+ sub %g2, 4, %g2
+ sll %g2, 2, %g2
+60: and %g1, 0x7f, %g3
+ sub %o0, %g7, %o0
+ add %g3, %g7, %g3
+ ba fixupretl
+ sub %g3, %g2, %g3
+51:
+/* i = 41 - g2; j = i % 6;
+ * g3 = (g1 & 15) + (i / 6) * 16 + (j < 4) ? (j + 1) * 4 : 16;
+ * o0 -= (i / 6) * 16 + 16;
+ */
+ neg %g2
+ and %g1, 0xf, %g1
+ add %g2, 41, %g2
+ add %o0, %g1, %o0
+1: cmp %g2, 6
+ bcs,a 2f
+ cmp %g2, 4
+ add %g1, 16, %g1
+ b 1b
+ sub %g2, 6, %g2
+2: bcc,a 2f
+ mov 16, %g2
+ inc %g2
+ sll %g2, 2, %g2
+2: add %g1, %g2, %g3
+ ba fixupretl
+ sub %o0, %g3, %o0
+52:
+/* g3 = g1 + g7 - (g2 / 8) * 32 + (g2 & 4) ? (g2 & 3) * 8 : 0;
+ o0 += (g2 / 8) * 32 */
+ andn %g2, 7, %g4
+ add %o0, %g7, %o0
+ andcc %g2, 4, %g0
+ and %g2, 3, %g2
+ sll %g4, 2, %g4
+ sll %g2, 3, %g2
+ bne 60b
+ sub %g7, %g4, %g7
+ ba 60b
+ clr %g2
+53:
+/* g3 = o3 + (o2 & 15) - (g2 & 8) - (g2 & 4) ? (g2 & 3) * 2 : 0;
+ o0 += (g2 & 8) */
+ and %g2, 3, %g4
+ andcc %g2, 4, %g0
+ and %g2, 8, %g2
+ sll %g4, 1, %g4
+ be 1f
+ add %o0, %g2, %o0
+ add %g2, %g4, %g2
+1: and %o2, 0xf, %g3
+ add %g3, %o3, %g3
+ ba fixupretl
+ sub %g3, %g2, %g3
+54:
+/* g3 = o3 + (o2 & 15) - (g2 / 4) * 2 - (g2 & 2) ? (g2 & 1) : 0;
+ o0 += (g2 / 4) * 2 */
+ srl %g2, 2, %o4
+ and %g2, 1, %o5
+ srl %g2, 1, %g2
+ add %o4, %o4, %o4
+ and %o5, %g2, %o5
+ and %o2, 0xf, %o2
+ add %o0, %o4, %o0
+ sub %o3, %o5, %o3
+ sub %o2, %o4, %o2
+ ba fixupretl
+ add %o2, %o3, %g3
+55:
+/* i = 27 - g2;
+ g3 = (o2 & 1) + i / 4 * 2 + !(i & 3);
+ o0 -= i / 4 * 2 + 1 */
+ neg %g2
+ and %o2, 1, %o2
+ add %g2, 27, %g2
+ srl %g2, 2, %o5
+ andcc %g2, 3, %g0
+ mov 1, %g2
+ add %o5, %o5, %o5
+ be,a 1f
+ clr %g2
+1: add %g2, %o5, %g3
+ sub %o0, %g3, %o0
+ ba fixupretl
+ add %g3, %o2, %g3
+
+ .globl __copy_user_end
+__copy_user_end:
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 09:26:10 +0000