Helge,
In arch/parisc/kernel/entry.S (execve_wrapper) we have this code:
BL \execve,%r2
copy %r1,%arg0
ldo -FRAME_SIZE(%r30),%r30
LDREG -RP_OFFSET(%r30),%r2
/* If exec succeeded we need to load the args */
ldo -1024(%r0),%r1
cmpb,>>= %r28,%r1,error_\execve
copy %r2,%r19
error_\execve:
bv %r0(%r19)
nop
.endm
Why does this wrapper check the result of execve?
The cmpb has no nullification, therefore it always copies the return
pointer into r19, and we branch back to the syscall return path. IMO
checking the result of the syscall is not useful, since everything
should already be setup such that the normal restore process returns
to the newly exec'd process.
Comments?
Cheers,
Carlos.
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