ack/plat/osxppc/libsys/lseek.s at 65oo2 - d0p1/ack - Cute Engineering : Cute solutions to hard problems

d0p1/ack

George Koehler 02fb480217 Commit a preview of osx386 and osxppc as new platforms.

These produce Mach-o executables for Mac OS X on Intel or PowerPC
processors.  Our code generator for PowerPC (mach/powerpc) still has
bugs.  Some examples seem to run, but startrek crashes.  Our code
generator for Intel (mach/i386) is better.

There is a problem with job control.  If you run paranoia or startrek,
then suspend the job (^Z) and resume it ('fg' in bash), then read(2)
might fail with EINTR.

The larger files in this commit are
 - plat/osx/cvmach/cvmach.c
 - plat/osx/libsys/brk.c
 - plat/osx386/libsys/sigaction.s
 - plat/osxppc/libsys/sigaction.s

2016-10-02 14:58:05 -04:00

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 .sect .text
 .define _lseek
 _lseek:
 	addi r0, r0, 199	! lseek
 	lwz r3, 0(sp)		! fd
 	! ack passes 4-byte off_t, but system call takes 8-byte off_t
 	addi r4, r0, 0		! offset (high word)
 	lwz r5, 4(sp)		! offset (low word)
 	lwz r6, 8(sp)		! whence
 	sc 0
 	b .set_errno
 	or r3, r4, r4		! return offset (low word)
 	bclr 20, 0, 0