sparc: Fix system call tracing register handling.

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A system call trace trigger on entry allows the tracing
process to inspect and potentially change the traced
process's registers.

Account for that by reloading the %g1 (syscall number)
and %i0-%i5 (syscall argument) values.  We need to be
careful to revalidate the range of %g1, and reload the
system call table entry it corresponds to into %l7.

Reported-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Tested-by: Mike Frysinger <vapier@gentoo.org>

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Mike Frysinger 2016-01-18 06:32:30 -05:00 • committed by David S. Miller

parent c10910c323

commit 1a40b95374

2 changed files with 53 additions and 0 deletions

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17

arch/sparc/kernel/entry.S

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36

arch/sparc/kernel/syscalls.S

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