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Chris Metcalf 81711cee93 arch/tile: handle rt_sigreturn() more cleanly ... The current tile rt_sigreturn() syscall pattern uses the common idiom of loading up pt_regs with all the saved registers from the time of the signal, then anticipating the fact that we will clobber the ABI "return value" register (r0) as we return from the syscall by setting the rt_sigreturn return value to whatever random value was in the pt_regs for r0. However, this breaks in our 64-bit kernel when running "compat" tasks, since we always sign-extend the "return value" register to properly handle returned pointers that are in the upper 2GB of the 32-bit compat address space. Doing this to the sigreturn path then causes occasional random corruption of the 64-bit r0 register. Instead, we stop doing the crazy "load the return-value register" hack in sigreturn. We already have some sigreturn-specific assembly code that we use to pass the pt_regs pointer to C code. We extend that code to also set the link register to point to a spot a few instructions after the usual syscall return address so we don't clobber the saved r0. Now it no longer matters what the rt_sigreturn syscall returns, and the pt_regs structure can be cleanly and completely reloaded. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>		14 years ago
..
Makefile	pci root complex: support for tile architecture	14 years ago
asm-offsets.c	…
backtrace.c	arch/tile: support new info op generated by compiler	15 years ago
compat.c	BKL: remove extraneous #include <smp_lock.h>	14 years ago
compat_signal.c	arch/tile: handle rt_sigreturn() more cleanly	14 years ago
early_printk.c	arch/tile: bomb raw_local_irq_ to arch_local_irq_	14 years ago
entry.S	arch/tile: parameterize system PLs to support KVM port	15 years ago
hardwall.c	arch/tile: mark "hardwall" device as non-seekable	14 years ago
head_32.S	arch/tile: parameterize system PLs to support KVM port	15 years ago
hvglue.lds	arch/tile: Enable more sophisticated IRQ model for 32-bit chips.	15 years ago
init_task.c	…
intvec_32.S	arch/tile: handle rt_sigreturn() more cleanly	14 years ago
irq.c	arch/tile: bomb raw_local_irq_ to arch_local_irq_	14 years ago
machine_kexec.c	arch/tile: complete migration to new kmap_atomic scheme	14 years ago
messaging.c	arch/tile: bomb raw_local_irq_ to arch_local_irq_	14 years ago
module.c	arch/tile: Miscellaneous cleanup changes.	15 years ago
pci-dma.c	…
pci.c	pci root complex: support for tile architecture	14 years ago
proc.c	arch: tile: kernel/proc.c Removed duplicated #include	15 years ago
process.c	arch/tile: handle CLONE_SETTLS in copy_thread(), not user space	14 years ago
ptrace.c	arch/tile: don't allow user code to set the PL via ptrace or signal return	14 years ago
reboot.c	arch/tile: bomb raw_local_irq_ to arch_local_irq_	14 years ago
regs_32.S	arch/tile: parameterize system PLs to support KVM port	15 years ago
relocate_kernel.S	…
setup.c	arch/tile: make glibc's sysconf(_SC_NPROCESSORS_CONF) work correctly	14 years ago
signal.c	arch/tile: handle rt_sigreturn() more cleanly	14 years ago
single_step.c	arch/tile: enable single-step support for TILE-Gx	15 years ago
smp.c	arch/tile: bomb raw_local_irq_ to arch_local_irq_	14 years ago
smpboot.c	BKL: remove extraneous #include <smp_lock.h>	14 years ago
stack.c	arch/tile: prevent corrupt top frame from causing backtracer runaway	15 years ago
sys.c	BKL: remove extraneous #include <smp_lock.h>	14 years ago
tile-desc_32.c	arch/tile: Shrink the tile-opcode files considerably.	15 years ago
time.c	arch/tile: bomb raw_local_irq_ to arch_local_irq_	14 years ago
tlb.c	…
traps.c	arch/tile: enable single-step support for TILE-Gx	15 years ago
vmlinux.lds.S	arch/tile: Miscellaneous cleanup changes.	15 years ago