diff options
author | Al Viro <viro@zeniv.linux.org.uk> | 2020-07-13 15:12:48 -0400 |
---|---|---|
committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-08-20 15:45:19 -0400 |
commit | ab5e8b33124468fe9d7d6042de5a9b35414c784e (patch) | |
tree | 7f6ec7f2004819c68b0a18a25f2348e0ca35720e /arch/sparc/lib | |
parent | e8b95089990ceac4e5197db3c03737bf569f5081 (diff) | |
download | linux-ab5e8b33124468fe9d7d6042de5a9b35414c784e.tar.bz2 |
sparc32: propagate the calling conventions change down to __csum_partial_copy_sparc_generic()
... and get rid of zeroing the target, etc. on fault.
All exception handlers merge into one; moreover, since we are not
calling lookup_fault() anymore, we don't need the magic with passing
arguments for it from the page fault handler.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/sparc/lib')
-rw-r--r-- | arch/sparc/lib/checksum_32.S | 202 |
1 files changed, 38 insertions, 164 deletions
diff --git a/arch/sparc/lib/checksum_32.S b/arch/sparc/lib/checksum_32.S index 6a5469c97246..7488d130faf7 100644 --- a/arch/sparc/lib/checksum_32.S +++ b/arch/sparc/lib/checksum_32.S @@ -144,44 +144,21 @@ cpte: bne csum_partial_end_cruft ! yep, handle it cpout: retl ! get outta here mov %o2, %o0 ! return computed csum - .globl __csum_partial_copy_start, __csum_partial_copy_end -__csum_partial_copy_start: - /* 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 30f; \ - a, b, %o3; \ - .section __ex_table,ALLOC; \ - .align 4; \ - .word 98b, 99b; \ - .text; \ - .align 4 - -#define EX2(x,y) \ -98: x,y; \ - .section __ex_table,ALLOC; \ - .align 4; \ - .word 98b, 30f; \ - .text; \ - .align 4 - -#define EX3(x,y) \ +#define EX(x,y) \ 98: x,y; \ .section __ex_table,ALLOC; \ .align 4; \ - .word 98b, 96f; \ + .word 98b, cc_fault; \ .text; \ .align 4 -#define EXT(start,end,handler) \ +#define EXT(start,end) \ .section __ex_table,ALLOC; \ .align 4; \ - .word start, 0, end, handler; \ + .word start, 0, end, cc_fault; \ .text; \ .align 4 @@ -252,21 +229,21 @@ __csum_partial_copy_start: cc_end_cruft: be 1f andcc %o3, 4, %g0 - EX(ldd [%o0 + 0x00], %g2, and %o3, 0xf) + EX(ldd [%o0 + 0x00], %g2) add %o1, 8, %o1 addcc %g2, %g7, %g7 add %o0, 8, %o0 addxcc %g3, %g7, %g7 - EX2(st %g2, [%o1 - 0x08]) + EX(st %g2, [%o1 - 0x08]) addx %g0, %g7, %g7 andcc %o3, 4, %g0 - EX2(st %g3, [%o1 - 0x04]) + EX(st %g3, [%o1 - 0x04]) 1: be 1f andcc %o3, 3, %o3 - EX(ld [%o0 + 0x00], %g2, add %o3, 4) + EX(ld [%o0 + 0x00], %g2) add %o1, 4, %o1 addcc %g2, %g7, %g7 - EX2(st %g2, [%o1 - 0x04]) + EX(st %g2, [%o1 - 0x04]) addx %g0, %g7, %g7 andcc %o3, 3, %g0 add %o0, 4, %o0 @@ -276,14 +253,14 @@ cc_end_cruft: subcc %o3, 2, %o3 b 4f or %g0, %g0, %o4 -2: EX(lduh [%o0 + 0x00], %o4, add %o3, 2) +2: EX(lduh [%o0 + 0x00], %o4) add %o0, 2, %o0 - EX2(sth %o4, [%o1 + 0x00]) + EX(sth %o4, [%o1 + 0x00]) be 6f add %o1, 2, %o1 sll %o4, 16, %o4 -4: EX(ldub [%o0 + 0x00], %o5, add %g0, 1) - EX2(stb %o5, [%o1 + 0x00]) +4: EX(ldub [%o0 + 0x00], %o5) + EX(stb %o5, [%o1 + 0x00]) sll %o5, 8, %o5 or %o5, %o4, %o4 6: addcc %o4, %g7, %g7 @@ -306,9 +283,9 @@ cc_dword_align: andcc %o0, 0x2, %g0 be 1f andcc %o0, 0x4, %g0 - EX(lduh [%o0 + 0x00], %g4, add %g1, 0) + EX(lduh [%o0 + 0x00], %g4) sub %g1, 2, %g1 - EX2(sth %g4, [%o1 + 0x00]) + EX(sth %g4, [%o1 + 0x00]) add %o0, 2, %o0 sll %g4, 16, %g4 addcc %g4, %g7, %g7 @@ -322,9 +299,9 @@ cc_dword_align: or %g3, %g7, %g7 1: be 3f andcc %g1, 0xffffff80, %g0 - EX(ld [%o0 + 0x00], %g4, add %g1, 0) + EX(ld [%o0 + 0x00], %g4) sub %g1, 4, %g1 - EX2(st %g4, [%o1 + 0x00]) + EX(st %g4, [%o1 + 0x00]) add %o0, 4, %o0 addcc %g4, %g7, %g7 add %o1, 4, %o1 @@ -354,7 +331,7 @@ __csum_partial_copy_sparc_generic: CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x20,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x40,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) CSUMCOPY_BIGCHUNK(%o0,%o1,%g7,0x60,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) -10: EXT(5b, 10b, 20f) ! note for exception handling +10: EXT(5b, 10b) ! note for exception handling sub %g1, 128, %g1 ! detract from length addx %g0, %g7, %g7 ! add in last carry bit andcc %g1, 0xffffff80, %g0 ! more to csum? @@ -379,7 +356,7 @@ cctbl: CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x68,%g2,%g3,%g4,%g5) CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x28,%g2,%g3,%g4,%g5) CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x18,%g2,%g3,%g4,%g5) CSUMCOPY_LASTCHUNK(%o0,%o1,%g7,0x08,%g2,%g3,%g4,%g5) -12: EXT(cctbl, 12b, 22f) ! note for exception table handling +12: EXT(cctbl, 12b) ! note for exception table handling addx %g0, %g7, %g7 andcc %o3, 0xf, %g0 ! check for low bits set ccte: bne cc_end_cruft ! something left, handle it out of band @@ -390,7 +367,7 @@ ccdbl: CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x00,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x20,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x40,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) CSUMCOPY_BIGCHUNK_ALIGNED(%o0,%o1,%g7,0x60,%o4,%o5,%g2,%g3,%g4,%g5,%o2,%o3) -11: EXT(ccdbl, 11b, 21f) ! note for exception table handling +11: EXT(ccdbl, 11b) ! note for exception table handling sub %g1, 128, %g1 ! detract from length addx %g0, %g7, %g7 ! add in last carry bit andcc %g1, 0xffffff80, %g0 ! more to csum? @@ -407,9 +384,9 @@ ccslow: cmp %g1, 0 be,a 1f srl %g1, 1, %g4 sub %g1, 1, %g1 - EX(ldub [%o0], %g5, add %g1, 1) + EX(ldub [%o0], %g5) add %o0, 1, %o0 - EX2(stb %g5, [%o1]) + EX(stb %g5, [%o1]) srl %g1, 1, %g4 add %o1, 1, %o1 1: cmp %g4, 0 @@ -418,34 +395,34 @@ ccslow: cmp %g1, 0 andcc %o0, 2, %g0 be,a 1f srl %g4, 1, %g4 - EX(lduh [%o0], %o4, add %g1, 0) + EX(lduh [%o0], %o4) sub %g1, 2, %g1 srl %o4, 8, %g2 sub %g4, 1, %g4 - EX2(stb %g2, [%o1]) + EX(stb %g2, [%o1]) add %o4, %g5, %g5 - EX2(stb %o4, [%o1 + 1]) + EX(stb %o4, [%o1 + 1]) add %o0, 2, %o0 srl %g4, 1, %g4 add %o1, 2, %o1 1: cmp %g4, 0 be,a 2f andcc %g1, 2, %g0 - EX3(ld [%o0], %o4) + EX(ld [%o0], %o4) 5: srl %o4, 24, %g2 srl %o4, 16, %g3 - EX2(stb %g2, [%o1]) + EX(stb %g2, [%o1]) srl %o4, 8, %g2 - EX2(stb %g3, [%o1 + 1]) + EX(stb %g3, [%o1 + 1]) add %o0, 4, %o0 - EX2(stb %g2, [%o1 + 2]) + EX(stb %g2, [%o1 + 2]) addcc %o4, %g5, %g5 - EX2(stb %o4, [%o1 + 3]) + EX(stb %o4, [%o1 + 3]) addx %g5, %g0, %g5 ! I am now to lazy to optimize this (question it add %o1, 4, %o1 ! is worthy). Maybe some day - with the sll/srl subcc %g4, 1, %g4 ! tricks bne,a 5b - EX3(ld [%o0], %o4) + EX(ld [%o0], %o4) sll %g5, 16, %g2 srl %g5, 16, %g5 srl %g2, 16, %g2 @@ -453,19 +430,19 @@ ccslow: cmp %g1, 0 add %g2, %g5, %g5 2: be,a 3f andcc %g1, 1, %g0 - EX(lduh [%o0], %o4, and %g1, 3) + EX(lduh [%o0], %o4) andcc %g1, 1, %g0 srl %o4, 8, %g2 add %o0, 2, %o0 - EX2(stb %g2, [%o1]) + EX(stb %g2, [%o1]) add %g5, %o4, %g5 - EX2(stb %o4, [%o1 + 1]) + EX(stb %o4, [%o1 + 1]) add %o1, 2, %o1 3: be,a 1f sll %g5, 16, %o4 - EX(ldub [%o0], %g2, add %g0, 1) + EX(ldub [%o0], %g2) sll %g2, 8, %o4 - EX2(stb %g2, [%o1]) + EX(stb %g2, [%o1]) add %g5, %o4, %g5 sll %g5, 16, %o4 1: addcc %o4, %g5, %g5 @@ -481,113 +458,10 @@ ccslow: cmp %g1, 0 4: addcc %g7, %g5, %g7 retl addx %g0, %g7, %o0 -__csum_partial_copy_end: /* We do these strange calculations for the csum_*_from_user case only, ie. * we only bother with faults on loads... */ -/* o2 = ((g2%20)&3)*8 - * o3 = g1 - (g2/20)*32 - o2 */ -20: - cmp %g2, 20 - blu,a 1f - and %g2, 3, %o2 - sub %g1, 32, %g1 - b 20b - sub %g2, 20, %g2 -1: - sll %o2, 3, %o2 - b 31f - sub %g1, %o2, %o3 - -/* o2 = (!(g2 & 15) ? 0 : (((g2 & 15) + 1) & ~1)*8) - * o3 = g1 - (g2/16)*32 - o2 */ -21: - andcc %g2, 15, %o3 - srl %g2, 4, %g2 - be,a 1f - clr %o2 - add %o3, 1, %o3 - and %o3, 14, %o3 - sll %o3, 3, %o2 -1: - sll %g2, 5, %g2 - sub %g1, %g2, %o3 - b 31f - sub %o3, %o2, %o3 - -/* o0 += (g2/10)*16 - 0x70 - * 01 += (g2/10)*16 - 0x70 - * o2 = (g2 % 10) ? 8 : 0 - * o3 += 0x70 - (g2/10)*16 - o2 */ -22: - cmp %g2, 10 - blu,a 1f - sub %o0, 0x70, %o0 - add %o0, 16, %o0 - add %o1, 16, %o1 - sub %o3, 16, %o3 - b 22b - sub %g2, 10, %g2 -1: - sub %o1, 0x70, %o1 - add %o3, 0x70, %o3 - clr %o2 - tst %g2 - bne,a 1f - mov 8, %o2 -1: - b 31f - sub %o3, %o2, %o3 -96: - and %g1, 3, %g1 - sll %g4, 2, %g4 - add %g1, %g4, %o3 -30: -/* %o1 is dst - * %o3 is # bytes to zero out - * %o4 is faulting address - * %o5 is %pc where fault occurred */ - clr %o2 -31: -/* %o0 is src - * %o1 is dst - * %o2 is # of bytes to copy from src to dst - * %o3 is # bytes to zero out - * %o4 is faulting address - * %o5 is %pc where fault occurred */ - save %sp, -104, %sp - mov %i5, %o0 - mov %i7, %o1 - mov %i4, %o2 - call lookup_fault - mov %g7, %i4 - cmp %o0, 2 - bne 1f - add %g0, -EFAULT, %i5 - tst %i2 - be 2f - mov %i0, %o1 - mov %i1, %o0 -5: - call memcpy - mov %i2, %o2 - tst %o0 - bne,a 2f - add %i3, %i2, %i3 - add %i1, %i2, %i1 -2: - mov %i1, %o0 -6: - call __bzero - mov %i3, %o1 -1: - ld [%sp + 168], %o2 ! struct_ptr of parent - st %i5, [%o2] +cc_fault: ret - restore - - .section __ex_table,#alloc - .align 4 - .word 5b,2 - .word 6b,2 + clr %o0 |