forked from Minki/linux
bd6be579a7
Functions in math-emu are annotated as ENTRY() symbols, but their
ends are not annotated at all. But these are standard functions
called from C, with proper stack register update etc.
Omitting the ends means:
* the annotations are not paired and we cannot deal with such functions
e.g. in objtool
* the symbols are not marked as functions in the object file
* there are no sizes of the functions in the object file
So fix this by adding ENDPROC() to each such case in math-emu.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170824080624.7768-1-jslaby@suse.cz
Signed-off-by: Ingo Molnar <mingo@kernel.org>
207 lines
6.1 KiB
ArmAsm
207 lines
6.1 KiB
ArmAsm
.file "wm_shrx.S"
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/*---------------------------------------------------------------------------+
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| wm_shrx.S |
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| 64 bit right shift functions |
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| Copyright (C) 1992,1995 |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
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| Australia. E-mail billm@jacobi.maths.monash.edu.au |
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| Call from C as: |
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| unsigned FPU_shrx(void *arg1, unsigned arg2) |
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| and |
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| unsigned FPU_shrxs(void *arg1, unsigned arg2) |
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+---------------------------------------------------------------------------*/
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#include "fpu_emu.h"
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.text
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/*---------------------------------------------------------------------------+
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| unsigned FPU_shrx(void *arg1, unsigned arg2) |
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| Extended shift right function. |
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| Fastest for small shifts. |
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| Shifts the 64 bit quantity pointed to by the first arg (arg1) |
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| right by the number of bits specified by the second arg (arg2). |
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| Forms a 96 bit quantity from the 64 bit arg and eax: |
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| [ 64 bit arg ][ eax ] |
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| shift right ---------> |
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| The eax register is initialized to 0 before the shifting. |
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| Results returned in the 64 bit arg and eax. |
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+---------------------------------------------------------------------------*/
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ENTRY(FPU_shrx)
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push %ebp
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movl %esp,%ebp
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pushl %esi
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movl PARAM2,%ecx
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movl PARAM1,%esi
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cmpl $32,%ecx /* shrd only works for 0..31 bits */
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jnc L_more_than_31
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/* less than 32 bits */
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pushl %ebx
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movl (%esi),%ebx /* lsl */
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movl 4(%esi),%edx /* msl */
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xorl %eax,%eax /* extension */
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shrd %cl,%ebx,%eax
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shrd %cl,%edx,%ebx
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shr %cl,%edx
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movl %ebx,(%esi)
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movl %edx,4(%esi)
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popl %ebx
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popl %esi
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leave
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ret
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L_more_than_31:
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cmpl $64,%ecx
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jnc L_more_than_63
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subb $32,%cl
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movl (%esi),%eax /* lsl */
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movl 4(%esi),%edx /* msl */
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shrd %cl,%edx,%eax
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shr %cl,%edx
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movl %edx,(%esi)
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movl $0,4(%esi)
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popl %esi
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leave
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ret
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L_more_than_63:
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cmpl $96,%ecx
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jnc L_more_than_95
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subb $64,%cl
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movl 4(%esi),%eax /* msl */
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shr %cl,%eax
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xorl %edx,%edx
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movl %edx,(%esi)
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movl %edx,4(%esi)
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popl %esi
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leave
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ret
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L_more_than_95:
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xorl %eax,%eax
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movl %eax,(%esi)
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movl %eax,4(%esi)
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popl %esi
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leave
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ret
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ENDPROC(FPU_shrx)
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/*---------------------------------------------------------------------------+
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| unsigned FPU_shrxs(void *arg1, unsigned arg2) |
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| Extended shift right function (optimized for small floating point |
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| integers). |
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| Shifts the 64 bit quantity pointed to by the first arg (arg1) |
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| right by the number of bits specified by the second arg (arg2). |
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| Forms a 96 bit quantity from the 64 bit arg and eax: |
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| [ 64 bit arg ][ eax ] |
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| shift right ---------> |
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| The eax register is initialized to 0 before the shifting. |
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| The lower 8 bits of eax are lost and replaced by a flag which is |
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| set (to 0x01) if any bit, apart from the first one, is set in the |
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| part which has been shifted out of the arg. |
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| Results returned in the 64 bit arg and eax. |
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+---------------------------------------------------------------------------*/
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ENTRY(FPU_shrxs)
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push %ebp
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movl %esp,%ebp
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pushl %esi
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pushl %ebx
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movl PARAM2,%ecx
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movl PARAM1,%esi
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cmpl $64,%ecx /* shrd only works for 0..31 bits */
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jnc Ls_more_than_63
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cmpl $32,%ecx /* shrd only works for 0..31 bits */
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jc Ls_less_than_32
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/* We got here without jumps by assuming that the most common requirement
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is for small integers */
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/* Shift by [32..63] bits */
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subb $32,%cl
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movl (%esi),%eax /* lsl */
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movl 4(%esi),%edx /* msl */
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xorl %ebx,%ebx
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shrd %cl,%eax,%ebx
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shrd %cl,%edx,%eax
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shr %cl,%edx
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orl %ebx,%ebx /* test these 32 bits */
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setne %bl
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test $0x7fffffff,%eax /* and 31 bits here */
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setne %bh
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orw %bx,%bx /* Any of the 63 bit set ? */
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setne %al
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movl %edx,(%esi)
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movl $0,4(%esi)
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popl %ebx
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popl %esi
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leave
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ret
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/* Shift by [0..31] bits */
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Ls_less_than_32:
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movl (%esi),%ebx /* lsl */
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movl 4(%esi),%edx /* msl */
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xorl %eax,%eax /* extension */
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shrd %cl,%ebx,%eax
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shrd %cl,%edx,%ebx
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shr %cl,%edx
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test $0x7fffffff,%eax /* only need to look at eax here */
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setne %al
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movl %ebx,(%esi)
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movl %edx,4(%esi)
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popl %ebx
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popl %esi
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leave
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ret
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/* Shift by [64..95] bits */
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Ls_more_than_63:
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cmpl $96,%ecx
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jnc Ls_more_than_95
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subb $64,%cl
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movl (%esi),%ebx /* lsl */
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movl 4(%esi),%eax /* msl */
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xorl %edx,%edx /* extension */
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shrd %cl,%ebx,%edx
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shrd %cl,%eax,%ebx
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shr %cl,%eax
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orl %ebx,%edx
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setne %bl
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test $0x7fffffff,%eax /* only need to look at eax here */
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setne %bh
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orw %bx,%bx
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setne %al
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xorl %edx,%edx
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movl %edx,(%esi) /* set to zero */
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movl %edx,4(%esi) /* set to zero */
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popl %ebx
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popl %esi
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leave
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ret
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Ls_more_than_95:
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/* Shift by [96..inf) bits */
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xorl %eax,%eax
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movl (%esi),%ebx
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orl 4(%esi),%ebx
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setne %al
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xorl %ebx,%ebx
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movl %ebx,(%esi)
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movl %ebx,4(%esi)
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popl %ebx
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popl %esi
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leave
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ret
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ENDPROC(FPU_shrxs)
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