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Paul Mackerras 1bd79336a4 powerpc: Fix various syscall/signal/swapcontext bugs ... A careful reading of the recent changes to the system call entry/exit paths revealed several problems, plus some things that could be simplified and improved: * 32-bit wasn't testing the _TIF_NOERROR bit in the syscall fast exit path, so it was only doing anything with it once it saw some other bit being set. In other words, the noerror behaviour would apply to the next system call where we had to reschedule or deliver a signal, which is not necessarily the current system call. * 32-bit wasn't doing the call to ptrace_notify in the syscall exit path when the _TIF_SINGLESTEP bit was set. * _TIF_RESTOREALL was in both _TIF_USER_WORK_MASK and _TIF_PERSYSCALL_MASK, which is odd since _TIF_RESTOREALL is only set by system calls. I took it out of _TIF_USER_WORK_MASK. * On 64-bit, _TIF_RESTOREALL wasn't causing the non-volatile registers to be restored (unless perhaps a signal was delivered or the syscall was traced or single-stepped). Thus the non-volatile registers weren't restored on exit from a signal handler. We probably got away with it mostly because signal handlers written in C wouldn't alter the non-volatile registers. * On 32-bit I simplified the code and made it more like 64-bit by making the syscall exit path jump to ret_from_except to handle preemption and signal delivery. * 32-bit was calling do_signal unnecessarily when _TIF_RESTOREALL was set - but I think because of that 32-bit was actually restoring the non-volatile registers on exit from a signal handler. * I changed the order of enabling interrupts and saving the non-volatile registers before calling do_syscall_trace_leave; now we enable interrupts first. Signed-off-by: Paul Mackerras <paulus@samba.org>		19 years ago
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4xx_io	[PATCH] remove unused tmp_buf_sem's	19 years ago
8xx_io	[PATCH] kfree cleanup: arch	20 years ago
8260_io	…
amiga	[PATCH] m68k: kill mach_floppy_setup, convert to proper __setup() in drivers	19 years ago
boot	[PATCH] ppc: Remove powermac support from ARCH=ppc	19 years ago
configs	[PATCH] e1000: Added disable packet split capability	19 years ago
kernel	powerpc: Fix various syscall/signal/swapcontext bugs	19 years ago
lib	ppc32: use L1_CACHE_SHIFT/L1_CACHE_BYTES	20 years ago
math-emu	[PATCH] powerpc: Fix handling of fpscr on 64-bit	20 years ago
mm	[PATCH] ppc: Remove powermac support from ARCH=ppc	19 years ago
platforms	[SERIAL] uart_port flags member should use UPF_*	19 years ago
syslib	Merge master.kernel.org:/home/rmk/linux-2.6-serial	19 years ago
xmon	[PATCH] ppc: fix adb breakage in xmon	19 years ago
Kconfig	…
Kconfig.debug	…
Makefile	…