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| author | David S. Miller <davem@davemloft.net> | 2011-11-15 05:32:16 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-11-15 05:43:07 +0100 |
| commit | 1d299bc7732c34d85bd43ac1a8745f5a2fed2078 (patch) | |
| tree | 6a39fe975dd6c18ab0e5efda38ac0a5c04c62863 /arch/sparc/kernel/signal_32.c | |
| parent | sparc: sigutil: Include <linux/errno.h> (diff) | |
| download | linux-1d299bc7732c34d85bd43ac1a8745f5a2fed2078.tar.xz linux-1d299bc7732c34d85bd43ac1a8745f5a2fed2078.zip | |
sparc: Fix handling of orig_i0 wrt. debugging when restarting syscalls.
Although we provide a proper way for a debugger to control whether
syscall restart occurs, we run into problems because orig_i0 is not
saved and restored properly.
Luckily we can solve this problem without having to make debuggers
aware of the issue. Across system calls, several registers are
considered volatile and can be safely clobbered.
Therefore we use the pt_regs save area of one of those registers, %g2,
as a place to save and restore orig_i0.
Debuggers transparently will do the right thing because they save and
restore this register already.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel/signal_32.c')
| -rw-r--r-- | arch/sparc/kernel/signal_32.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/arch/sparc/kernel/signal_32.c b/arch/sparc/kernel/signal_32.c index 8ce247ac04cc..7dfaff64cd6b 100644 --- a/arch/sparc/kernel/signal_32.c +++ b/arch/sparc/kernel/signal_32.c @@ -519,10 +519,16 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0) siginfo_t info; int signr; + /* It's a lot of work and synchronization to add a new ptrace + * register for GDB to save and restore in order to get + * orig_i0 correct for syscall restarts when debugging. + * + * However, we luckily can use the fact that several registers + * are volatile across system calls. One such register is + * %g2, so use that as a place to save away orig_i0. + */ if (pt_regs_is_syscall(regs) && (regs->psr & PSR_C)) - restart_syscall = 1; - else - restart_syscall = 0; + regs->u_regs[UREG_G2] = orig_i0; if (test_thread_flag(TIF_RESTORE_SIGMASK)) oldset = ¤t->saved_sigmask; @@ -535,8 +541,12 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0) * the software "in syscall" bit, directing us to not perform * a syscall restart. */ - if (restart_syscall && !pt_regs_is_syscall(regs)) - restart_syscall = 0; + restart_syscall = 0; + if (pt_regs_is_syscall(regs) && (regs->psr & PSR_C)) { + restart_syscall = 1; + orig_i0 = regs->u_regs[UREG_G2]; + } + if (signr > 0) { if (restart_syscall) |