Greg Ungerer 0b98027122 m68knommu: fix user a5 register being overwritten ... On no-MMU systems the application a5 register can be overwitten with the address of the process data segment when processing application signals. For flat format applications compiled with full absolute relocation this effectively corrupts the a5 register on signal processing - and this very quickly leads to process crash and often takes out the whole system with a panic as well. This has no effect on flat format applications compiled with the more common PIC methods (such as -msep-data). These format applications reserve a5 for the pointer to the data segment anyway - so it doesn't change it. A long time ago the a5 register was used in the code packed into the user stack to enable signal return processing. And so it had to be restored on end of signal cleanup processing back to the original a5 user value. This was historically done by saving away a5 in the sigcontext structure. At some point (a long time back it seems) the a5 restore process was changed and it was hard coded to put the user data segment address directly into a5. Which is ok for the common PIC compiled application case, but breaks the full relocation application code. We no longer use this type of signal handling mechanism and so we don't need to do anything special to save and restore a5 at all now. So remove the code that hard codes a5 to the address of the user data segment. Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>		2016-08-08 12:38:47 +10:00
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.gitignore
asm-offsets.c
bootinfo_proc.c
dma.c	dma-mapping: use unsigned long for dma_attrs	2016-08-04 08:50:07 -04:00
early_printk.c	m68knommu: remove obsolete 68360 support	2016-03-07 10:07:17 +10:00
entry.S	m68k: Use conventional function parameters for do_sigreturn	2016-02-29 09:51:43 +01:00
head.S
ints.c
irq.c
m68k_ksyms.c
machine_kexec.c
Makefile
module.c
module.lds
pcibios.c
process.c
ptrace.c
relocate_kernel.S
setup_mm.c
setup_no.c	m68knommu: remove obsolete 68360 support	2016-03-07 10:07:17 +10:00
setup.c
signal.c	m68knommu: fix user a5 register being overwritten	2016-08-08 12:38:47 +10:00
sun3-head.S
sys_m68k.c
syscalltable.S	m68k: Wire up preadv2 and pwritev2	2016-04-07 11:44:44 +02:00
time.c	rtc: m68k: provide ioctl for q40	2016-06-04 00:23:22 +02:00
traps.c
vectors.c
vmlinux-nommu.lds
vmlinux-std.lds
vmlinux-sun3.lds
vmlinux.lds.S