diff options
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/lib/memcpy.S | 253 |
1 files changed, 143 insertions, 110 deletions
diff --git a/arch/mips/lib/memcpy.S b/arch/mips/lib/memcpy.S index eed6e07bf222..d630a28a118b 100644 --- a/arch/mips/lib/memcpy.S +++ b/arch/mips/lib/memcpy.S @@ -92,6 +92,10 @@ /* Pretech type */ #define SRC_PREFETCH 1 #define DST_PREFETCH 2 +#define LEGACY_MODE 1 +#define EVA_MODE 2 +#define USEROP 1 +#define KERNELOP 2 /* * Wrapper to add an entry in the exception table @@ -103,12 +107,14 @@ * addr : Address * handler : Exception handler */ -#define EXC(insn, type, reg, addr, handler) \ -9: insn reg, addr; \ - .section __ex_table,"a"; \ - PTR 9b, handler; \ - .previous +#define EXC(insn, type, reg, addr, handler) \ + .if \mode == LEGACY_MODE; \ +9: insn reg, addr; \ + .section __ex_table,"a"; \ + PTR 9b, handler; \ + .previous; \ + .endif /* * Only on the 64-bit kernel we can made use of 64-bit registers. */ @@ -177,7 +183,10 @@ #define LOADB(reg, addr, handler) EXC(lb, LD_INSN, reg, addr, handler) #define STOREB(reg, addr, handler) EXC(sb, ST_INSN, reg, addr, handler) -#define _PREF(hint, addr, type) PREF(hint, addr) +#define _PREF(hint, addr, type) \ + .if \mode == LEGACY_MODE; \ + PREF(hint, addr); \ + .endif #define PREFS(hint, addr) _PREF(hint, addr, SRC_PREFETCH) #define PREFD(hint, addr) _PREF(hint, addr, DST_PREFETCH) @@ -210,27 +219,23 @@ .set at=v1 #endif -/* - * t6 is used as a flag to note inatomic mode. - */ -LEAF(__copy_user_inatomic) - b __copy_user_common - li t6, 1 - END(__copy_user_inatomic) - -/* - * A combined memcpy/__copy_user - * __copy_user sets len to 0 for success; else to an upper bound of - * the number of uncopied bytes. - * memcpy sets v0 to dst. - */ .align 5 -LEAF(memcpy) /* a0=dst a1=src a2=len */ - move v0, dst /* return value */ -.L__memcpy: -FEXPORT(__copy_user) - li t6, 0 /* not inatomic */ -__copy_user_common: + + /* + * Macro to build the __copy_user common code + * Arguements: + * mode : LEGACY_MODE or EVA_MODE + * from : Source operand. USEROP or KERNELOP + * to : Destination operand. USEROP or KERNELOP + */ + .macro __BUILD_COPY_USER mode, from, to + + /* initialize __memcpy if this the first time we execute this macro */ + .ifnotdef __memcpy + .set __memcpy, 1 + .hidden __memcpy /* make sure it does not leak */ + .endif + /* * Note: dst & src may be unaligned, len may be 0 * Temps @@ -251,45 +256,45 @@ __copy_user_common: and t1, dst, ADDRMASK PREFS( 0, 1*32(src) ) PREFD( 1, 1*32(dst) ) - bnez t2, .Lcopy_bytes_checklen + bnez t2, .Lcopy_bytes_checklen\@ and t0, src, ADDRMASK PREFS( 0, 2*32(src) ) PREFD( 1, 2*32(dst) ) - bnez t1, .Ldst_unaligned + bnez t1, .Ldst_unaligned\@ nop - bnez t0, .Lsrc_unaligned_dst_aligned + bnez t0, .Lsrc_unaligned_dst_aligned\@ /* * use delay slot for fall-through * src and dst are aligned; need to compute rem */ -.Lboth_aligned: +.Lboth_aligned\@: SRL t0, len, LOG_NBYTES+3 # +3 for 8 units/iter - beqz t0, .Lcleanup_both_aligned # len < 8*NBYTES + beqz t0, .Lcleanup_both_aligned\@ # len < 8*NBYTES and rem, len, (8*NBYTES-1) # rem = len % (8*NBYTES) PREFS( 0, 3*32(src) ) PREFD( 1, 3*32(dst) ) .align 4 1: R10KCBARRIER(0(ra)) - LOAD(t0, UNIT(0)(src), .Ll_exc) - LOAD(t1, UNIT(1)(src), .Ll_exc_copy) - LOAD(t2, UNIT(2)(src), .Ll_exc_copy) - LOAD(t3, UNIT(3)(src), .Ll_exc_copy) + LOAD(t0, UNIT(0)(src), .Ll_exc\@) + LOAD(t1, UNIT(1)(src), .Ll_exc_copy\@) + LOAD(t2, UNIT(2)(src), .Ll_exc_copy\@) + LOAD(t3, UNIT(3)(src), .Ll_exc_copy\@) SUB len, len, 8*NBYTES - LOAD(t4, UNIT(4)(src), .Ll_exc_copy) - LOAD(t7, UNIT(5)(src), .Ll_exc_copy) - STORE(t0, UNIT(0)(dst), .Ls_exc_p8u) - STORE(t1, UNIT(1)(dst), .Ls_exc_p7u) - LOAD(t0, UNIT(6)(src), .Ll_exc_copy) - LOAD(t1, UNIT(7)(src), .Ll_exc_copy) + LOAD(t4, UNIT(4)(src), .Ll_exc_copy\@) + LOAD(t7, UNIT(5)(src), .Ll_exc_copy\@) + STORE(t0, UNIT(0)(dst), .Ls_exc_p8u\@) + STORE(t1, UNIT(1)(dst), .Ls_exc_p7u\@) + LOAD(t0, UNIT(6)(src), .Ll_exc_copy\@) + LOAD(t1, UNIT(7)(src), .Ll_exc_copy\@) ADD src, src, 8*NBYTES ADD dst, dst, 8*NBYTES - STORE(t2, UNIT(-6)(dst), .Ls_exc_p6u) - STORE(t3, UNIT(-5)(dst), .Ls_exc_p5u) - STORE(t4, UNIT(-4)(dst), .Ls_exc_p4u) - STORE(t7, UNIT(-3)(dst), .Ls_exc_p3u) - STORE(t0, UNIT(-2)(dst), .Ls_exc_p2u) - STORE(t1, UNIT(-1)(dst), .Ls_exc_p1u) + STORE(t2, UNIT(-6)(dst), .Ls_exc_p6u\@) + STORE(t3, UNIT(-5)(dst), .Ls_exc_p5u\@) + STORE(t4, UNIT(-4)(dst), .Ls_exc_p4u\@) + STORE(t7, UNIT(-3)(dst), .Ls_exc_p3u\@) + STORE(t0, UNIT(-2)(dst), .Ls_exc_p2u\@) + STORE(t1, UNIT(-1)(dst), .Ls_exc_p1u\@) PREFS( 0, 8*32(src) ) PREFD( 1, 8*32(dst) ) bne len, rem, 1b @@ -298,41 +303,41 @@ __copy_user_common: /* * len == rem == the number of bytes left to copy < 8*NBYTES */ -.Lcleanup_both_aligned: - beqz len, .Ldone +.Lcleanup_both_aligned\@: + beqz len, .Ldone\@ sltu t0, len, 4*NBYTES - bnez t0, .Lless_than_4units + bnez t0, .Lless_than_4units\@ and rem, len, (NBYTES-1) # rem = len % NBYTES /* * len >= 4*NBYTES */ - LOAD( t0, UNIT(0)(src), .Ll_exc) - LOAD( t1, UNIT(1)(src), .Ll_exc_copy) - LOAD( t2, UNIT(2)(src), .Ll_exc_copy) - LOAD( t3, UNIT(3)(src), .Ll_exc_copy) + LOAD( t0, UNIT(0)(src), .Ll_exc\@) + LOAD( t1, UNIT(1)(src), .Ll_exc_copy\@) + LOAD( t2, UNIT(2)(src), .Ll_exc_copy\@) + LOAD( t3, UNIT(3)(src), .Ll_exc_copy\@) SUB len, len, 4*NBYTES ADD src, src, 4*NBYTES R10KCBARRIER(0(ra)) - STORE(t0, UNIT(0)(dst), .Ls_exc_p4u) - STORE(t1, UNIT(1)(dst), .Ls_exc_p3u) - STORE(t2, UNIT(2)(dst), .Ls_exc_p2u) - STORE(t3, UNIT(3)(dst), .Ls_exc_p1u) + STORE(t0, UNIT(0)(dst), .Ls_exc_p4u\@) + STORE(t1, UNIT(1)(dst), .Ls_exc_p3u\@) + STORE(t2, UNIT(2)(dst), .Ls_exc_p2u\@) + STORE(t3, UNIT(3)(dst), .Ls_exc_p1u\@) .set reorder /* DADDI_WAR */ ADD dst, dst, 4*NBYTES - beqz len, .Ldone + beqz len, .Ldone\@ .set noreorder -.Lless_than_4units: +.Lless_than_4units\@: /* * rem = len % NBYTES */ - beq rem, len, .Lcopy_bytes + beq rem, len, .Lcopy_bytes\@ nop 1: R10KCBARRIER(0(ra)) - LOAD(t0, 0(src), .Ll_exc) + LOAD(t0, 0(src), .Ll_exc\@) ADD src, src, NBYTES SUB len, len, NBYTES - STORE(t0, 0(dst), .Ls_exc_p1u) + STORE(t0, 0(dst), .Ls_exc_p1u\@) .set reorder /* DADDI_WAR */ ADD dst, dst, NBYTES bne rem, len, 1b @@ -350,17 +355,17 @@ __copy_user_common: * more instruction-level parallelism. */ #define bits t2 - beqz len, .Ldone + beqz len, .Ldone\@ ADD t1, dst, len # t1 is just past last byte of dst li bits, 8*NBYTES SLL rem, len, 3 # rem = number of bits to keep - LOAD(t0, 0(src), .Ll_exc) + LOAD(t0, 0(src), .Ll_exc\@) SUB bits, bits, rem # bits = number of bits to discard SHIFT_DISCARD t0, t0, bits - STREST(t0, -1(t1), .Ls_exc) + STREST(t0, -1(t1), .Ls_exc\@) jr ra move len, zero -.Ldst_unaligned: +.Ldst_unaligned\@: /* * dst is unaligned * t0 = src & ADDRMASK @@ -371,23 +376,23 @@ __copy_user_common: * Set match = (src and dst have same alignment) */ #define match rem - LDFIRST(t3, FIRST(0)(src), .Ll_exc) + LDFIRST(t3, FIRST(0)(src), .Ll_exc\@) ADD t2, zero, NBYTES - LDREST(t3, REST(0)(src), .Ll_exc_copy) + LDREST(t3, REST(0)(src), .Ll_exc_copy\@) SUB t2, t2, t1 # t2 = number of bytes copied xor match, t0, t1 R10KCBARRIER(0(ra)) - STFIRST(t3, FIRST(0)(dst), .Ls_exc) - beq len, t2, .Ldone + STFIRST(t3, FIRST(0)(dst), .Ls_exc\@) + beq len, t2, .Ldone\@ SUB len, len, t2 ADD dst, dst, t2 - beqz match, .Lboth_aligned + beqz match, .Lboth_aligned\@ ADD src, src, t2 -.Lsrc_unaligned_dst_aligned: +.Lsrc_unaligned_dst_aligned\@: SRL t0, len, LOG_NBYTES+2 # +2 for 4 units/iter PREFS( 0, 3*32(src) ) - beqz t0, .Lcleanup_src_unaligned + beqz t0, .Lcleanup_src_unaligned\@ and rem, len, (4*NBYTES-1) # rem = len % 4*NBYTES PREFD( 1, 3*32(dst) ) 1: @@ -398,58 +403,58 @@ __copy_user_common: * are to the same unit (unless src is aligned, but it's not). */ R10KCBARRIER(0(ra)) - LDFIRST(t0, FIRST(0)(src), .Ll_exc) - LDFIRST(t1, FIRST(1)(src), .Ll_exc_copy) + LDFIRST(t0, FIRST(0)(src), .Ll_exc\@) + LDFIRST(t1, FIRST(1)(src), .Ll_exc_copy\@) SUB len, len, 4*NBYTES - LDREST(t0, REST(0)(src), .Ll_exc_copy) - LDREST(t1, REST(1)(src), .Ll_exc_copy) - LDFIRST(t2, FIRST(2)(src), .Ll_exc_copy) - LDFIRST(t3, FIRST(3)(src), .Ll_exc_copy) - LDREST(t2, REST(2)(src), .Ll_exc_copy) - LDREST(t3, REST(3)(src), .Ll_exc_copy) + LDREST(t0, REST(0)(src), .Ll_exc_copy\@) + LDREST(t1, REST(1)(src), .Ll_exc_copy\@) + LDFIRST(t2, FIRST(2)(src), .Ll_exc_copy\@) + LDFIRST(t3, FIRST(3)(src), .Ll_exc_copy\@) + LDREST(t2, REST(2)(src), .Ll_exc_copy\@) + LDREST(t3, REST(3)(src), .Ll_exc_copy\@) PREFS( 0, 9*32(src) ) # 0 is PREF_LOAD (not streamed) ADD src, src, 4*NBYTES #ifdef CONFIG_CPU_SB1 nop # improves slotting #endif - STORE(t0, UNIT(0)(dst), .Ls_exc_p4u) - STORE(t1, UNIT(1)(dst), .Ls_exc_p3u) - STORE(t2, UNIT(2)(dst), .Ls_exc_p2u) - STORE(t3, UNIT(3)(dst), .Ls_exc_p1u) + STORE(t0, UNIT(0)(dst), .Ls_exc_p4u\@) + STORE(t1, UNIT(1)(dst), .Ls_exc_p3u\@) + STORE(t2, UNIT(2)(dst), .Ls_exc_p2u\@) + STORE(t3, UNIT(3)(dst), .Ls_exc_p1u\@) PREFD( 1, 9*32(dst) ) # 1 is PREF_STORE (not streamed) .set reorder /* DADDI_WAR */ ADD dst, dst, 4*NBYTES bne len, rem, 1b .set noreorder -.Lcleanup_src_unaligned: - beqz len, .Ldone +.Lcleanup_src_unaligned\@: + beqz len, .Ldone\@ and rem, len, NBYTES-1 # rem = len % NBYTES - beq rem, len, .Lcopy_bytes + beq rem, len, .Lcopy_bytes\@ nop 1: R10KCBARRIER(0(ra)) - LDFIRST(t0, FIRST(0)(src), .Ll_exc) - LDREST(t0, REST(0)(src), .Ll_exc_copy) + LDFIRST(t0, FIRST(0)(src), .Ll_exc\@) + LDREST(t0, REST(0)(src), .Ll_exc_copy\@) ADD src, src, NBYTES SUB len, len, NBYTES - STORE(t0, 0(dst), .Ls_exc_p1u) + STORE(t0, 0(dst), .Ls_exc_p1u\@) .set reorder /* DADDI_WAR */ ADD dst, dst, NBYTES bne len, rem, 1b .set noreorder -.Lcopy_bytes_checklen: - beqz len, .Ldone +.Lcopy_bytes_checklen\@: + beqz len, .Ldone\@ nop -.Lcopy_bytes: +.Lcopy_bytes\@: /* 0 < len < NBYTES */ R10KCBARRIER(0(ra)) #define COPY_BYTE(N) \ - LOADB(t0, N(src), .Ll_exc); \ + LOADB(t0, N(src), .Ll_exc\@); \ SUB len, len, 1; \ - beqz len, .Ldone; \ - STOREB(t0, N(dst), .Ls_exc_p1) + beqz len, .Ldone\@; \ + STOREB(t0, N(dst), .Ls_exc_p1\@) COPY_BYTE(0) COPY_BYTE(1) @@ -459,16 +464,19 @@ __copy_user_common: COPY_BYTE(4) COPY_BYTE(5) #endif - LOADB(t0, NBYTES-2(src), .Ll_exc) + LOADB(t0, NBYTES-2(src), .Ll_exc\@) SUB len, len, 1 jr ra - STOREB(t0, NBYTES-2(dst), .Ls_exc_p1) -.Ldone: + STOREB(t0, NBYTES-2(dst), .Ls_exc_p1\@) +.Ldone\@: jr ra - nop + .if __memcpy == 1 END(memcpy) + .set __memcpy, 0 + .hidden __memcpy + .endif -.Ll_exc_copy: +.Ll_exc_copy\@: /* * Copy bytes from src until faulting load address (or until a * lb faults) @@ -483,20 +491,20 @@ __copy_user_common: nop LOADK t0, THREAD_BUADDR(t0) 1: - LOADB(t1, 0(src), .Ll_exc) + LOADB(t1, 0(src), .Ll_exc\@) ADD src, src, 1 sb t1, 0(dst) # can't fault -- we're copy_from_user .set reorder /* DADDI_WAR */ ADD dst, dst, 1 bne src, t0, 1b .set noreorder -.Ll_exc: +.Ll_exc\@: LOADK t0, TI_TASK($28) nop LOADK t0, THREAD_BUADDR(t0) # t0 is just past last good address nop SUB len, AT, t0 # len number of uncopied bytes - bnez t6, .Ldone /* Skip the zeroing part if inatomic */ + bnez t6, .Ldone\@ /* Skip the zeroing part if inatomic */ /* * Here's where we rely on src and dst being incremented in tandem, * See (3) above. @@ -510,7 +518,7 @@ __copy_user_common: */ .set reorder /* DADDI_WAR */ SUB src, len, 1 - beqz len, .Ldone + beqz len, .Ldone\@ .set noreorder 1: sb zero, 0(dst) ADD dst, dst, 1 @@ -531,7 +539,7 @@ __copy_user_common: #define SEXC(n) \ .set reorder; /* DADDI_WAR */ \ -.Ls_exc_p ## n ## u: \ +.Ls_exc_p ## n ## u\@: \ ADD len, len, n*NBYTES; \ jr ra; \ .set noreorder @@ -545,14 +553,15 @@ SEXC(3) SEXC(2) SEXC(1) -.Ls_exc_p1: +.Ls_exc_p1\@: .set reorder /* DADDI_WAR */ ADD len, len, 1 jr ra .set noreorder -.Ls_exc: +.Ls_exc\@: jr ra nop + .endm .align 5 LEAF(memmove) @@ -603,3 +612,27 @@ LEAF(__rmemcpy) /* a0=dst a1=src a2=len */ jr ra move a2, zero END(__rmemcpy) + +/* + * t6 is used as a flag to note inatomic mode. + */ +LEAF(__copy_user_inatomic) + b __copy_user_common + li t6, 1 + END(__copy_user_inatomic) + +/* + * A combined memcpy/__copy_user + * __copy_user sets len to 0 for success; else to an upper bound of + * the number of uncopied bytes. + * memcpy sets v0 to dst. + */ + .align 5 +LEAF(memcpy) /* a0=dst a1=src a2=len */ + move v0, dst /* return value */ +.L__memcpy: +FEXPORT(__copy_user) + li t6, 0 /* not inatomic */ +__copy_user_common: + /* Legacy Mode, user <-> user */ + __BUILD_COPY_USER LEGACY_MODE USEROP USEROP |