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Last change
on this file since 2641 was 378, checked in by bird, 22 years ago |
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#563: wanna do this on linux too.
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Property cvs2svn:cvs-rev
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1.2
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Property svn:eol-style
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native
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Property svn:executable
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*
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Property svn:keywords
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Author Date Id Revision
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File size:
1.2 KB
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| 1 | / control.s (emx+gcc) -- Copyright (c) 1993-1996 by Eberhard Mattes
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| 2 |
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| 3 | .globl __control87
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| 4 | .globl _control87
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| 5 |
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| 6 | .text
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| 7 |
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| 8 |
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| 9 | / unsigned _control87 (unsigned new, unsigned mask)
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| 10 |
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| 11 | #define cw_old 0(%esp)
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| 12 | #define cw_new 2(%esp)
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| 13 | /define ret_addr 4(%esp)
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| 14 | #define new 8(%esp)
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| 15 | #define mask 12(%esp)
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| 16 |
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| 17 | _control87:
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| 18 | __control87:
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| 19 | pushl %ecx /* Dummy (for control word) */
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| 20 | fstcw cw_old /* Store control word into memory */
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| 21 | movl mask, %ecx /* Get mask */
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| 22 | jecxz 1f /* Do not set cw => done */
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| 23 | movl new, %edx /* Get new bits */
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| 24 | andl %ecx, %edx /* Mask new bits by mask bits */
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| 25 | notl %ecx
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| 26 | movl cw_old, %eax /* Get old cw */
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| 27 | andl %ecx, %eax /* Apply mask to old cw */
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| 28 | orl %edx, %eax /* Insert new bits */
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| 29 | movw %ax, cw_new /* Put new cw into memory */
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| 30 | fldcw cw_new /* Load control word */
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| 31 | 1: popl %eax /* Return old cw in lower 16 bits */
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| 32 | movzwl %ax, %eax /* Clear upper 16 bits */
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| 33 | ret
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| 34 |
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