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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>
149 lines
3.6 KiB
ArmAsm
149 lines
3.6 KiB
ArmAsm
.file "reg_u_mul.S"
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/*---------------------------------------------------------------------------+
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| reg_u_mul.S |
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| Core multiplication routine |
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| Copyright (C) 1992,1993,1995,1997 |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
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| E-mail billm@suburbia.net |
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+---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------+
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| Basic multiplication routine. |
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| Does not check the resulting exponent for overflow/underflow |
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| FPU_u_mul(FPU_REG *a, FPU_REG *b, FPU_REG *c, unsigned int cw); |
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| Internal working is at approx 128 bits. |
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| Result is rounded to nearest 53 or 64 bits, using "nearest or even". |
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+---------------------------------------------------------------------------*/
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#include "exception.h"
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#include "fpu_emu.h"
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#include "control_w.h"
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#ifndef NON_REENTRANT_FPU
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/* Local storage on the stack: */
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#define FPU_accum_0 -4(%ebp) /* ms word */
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#define FPU_accum_1 -8(%ebp)
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#else
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/* Local storage in a static area: */
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.data
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.align 4,0
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FPU_accum_0:
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.long 0
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FPU_accum_1:
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.long 0
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#endif /* NON_REENTRANT_FPU */
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.text
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ENTRY(FPU_u_mul)
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pushl %ebp
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movl %esp,%ebp
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#ifndef NON_REENTRANT_FPU
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subl $8,%esp
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#endif /* NON_REENTRANT_FPU */
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pushl %esi
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pushl %edi
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pushl %ebx
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movl PARAM1,%esi
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movl PARAM2,%edi
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#ifdef PARANOID
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testl $0x80000000,SIGH(%esi)
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jz L_bugged
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testl $0x80000000,SIGH(%edi)
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jz L_bugged
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#endif /* PARANOID */
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xorl %ecx,%ecx
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xorl %ebx,%ebx
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movl SIGL(%esi),%eax
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mull SIGL(%edi)
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movl %eax,FPU_accum_0
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movl %edx,FPU_accum_1
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movl SIGL(%esi),%eax
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mull SIGH(%edi)
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addl %eax,FPU_accum_1
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adcl %edx,%ebx
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/* adcl $0,%ecx // overflow here is not possible */
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movl SIGH(%esi),%eax
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mull SIGL(%edi)
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addl %eax,FPU_accum_1
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adcl %edx,%ebx
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adcl $0,%ecx
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movl SIGH(%esi),%eax
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mull SIGH(%edi)
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addl %eax,%ebx
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adcl %edx,%ecx
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/* Get the sum of the exponents. */
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movl PARAM6,%eax
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subl EXP_BIAS-1,%eax
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/* Two denormals can cause an exponent underflow */
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cmpl EXP_WAY_UNDER,%eax
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jg Exp_not_underflow
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/* Set to a really low value allow correct handling */
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movl EXP_WAY_UNDER,%eax
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Exp_not_underflow:
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/* Have now finished with the sources */
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movl PARAM3,%edi /* Point to the destination */
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movw %ax,EXP(%edi)
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/* Now make sure that the result is normalized */
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testl $0x80000000,%ecx
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jnz LResult_Normalised
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/* Normalize by shifting left one bit */
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shll $1,FPU_accum_0
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rcll $1,FPU_accum_1
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rcll $1,%ebx
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rcll $1,%ecx
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decw EXP(%edi)
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LResult_Normalised:
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movl FPU_accum_0,%eax
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movl FPU_accum_1,%edx
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orl %eax,%eax
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jz L_extent_zero
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orl $1,%edx
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L_extent_zero:
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movl %ecx,%eax
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jmp fpu_reg_round
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#ifdef PARANOID
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L_bugged:
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pushl EX_INTERNAL|0x205
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call EXCEPTION
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pop %ebx
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jmp L_exit
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L_exit:
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popl %ebx
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popl %edi
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popl %esi
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leave
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ret
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#endif /* PARANOID */
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ENDPROC(FPU_u_mul)
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