user/sven/linux.git/arch/powerpc/kernel/misc.S, branch v4.18.8

powerpc/misc: merge reloc_offset() and add_reloc_offset()

2018-06-03T14:39:17Z

reloc_offset() is the same as add_reloc_offset(0) Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman

powerpc/32: Use stmw/lmw for registers save/restore in asm

2018-05-17T14:09:06Z

arch/powerpc/Makefile activates -mmultiple on BE PPC32 configs in order to use multiple word instructions in functions entry/exit. The patch does the same for the asm parts, for consistency. On processors like the 8xx on which insn fetching is pretty slow, this speeds up registers save/restore. Signed-off-by: Christophe Leroy [mpe: PPC32 is BE only, so drop the endian checks] Signed-off-by: Michael Ellerman

powerpc: Avoid an unnecessary test and branch in longjmp()

2018-05-17T14:09:05Z

Doing the test at exit of the function avoids an unnecessary test and branch inside longjmp(). Semantics are unchanged. Signed-off-by: Christophe Leroy Reviewed-by: Michael Ellerman Signed-off-by: Michael Ellerman

ppc: move exports to definitions

2016-08-08T03:50:09Z

Signed-off-by: Al Viro

powerpc: Rename __get_SP() to current_stack_pointer()

2014-10-15T00:23:20Z

Michael points out that __get_SP() is a pretty horrible function name. Let's give it a better name. Signed-off-by: Anton Blanchard Signed-off-by: Michael Ellerman

powerpc: Reimplement __get_SP() as a function not a define

2014-10-15T00:23:19Z

Li Zhong points out an issue with our current __get_SP() implementation. If ftrace function tracing is enabled (ie -pg profiling using _mcount) we spill a stack frame on 64bit all the time. If a function calls __get_SP() and later calls a function that is tail call optimised, we will pop the stack frame and the value returned by __get_SP() is no longer valid. An example from Li can be found in save_stack_trace -> save_context_stack: c0000000000432c0 <.save_stack_trace>: c0000000000432c0: mflr r0 c0000000000432c4: std r0,16(r1) c0000000000432c8: stdu r1,-128(r1) <-- stack frame for _mcount c0000000000432cc: std r3,112(r1) c0000000000432d0: bl <._mcount> c0000000000432d4: nop c0000000000432d8: mr r4,r1 <-- __get_SP() c0000000000432dc: ld r5,632(r13) c0000000000432e0: ld r3,112(r1) c0000000000432e4: li r6,1 c0000000000432e8: addi r1,r1,128 <-- pop stack frame c0000000000432ec: ld r0,16(r1) c0000000000432f0: mtlr r0 c0000000000432f4: b <.save_context_stack> <-- tail call optimized save_context_stack ends up with a stack pointer below the current one, and it is likely to be scribbled over. Fix this by making __get_SP() a function which returns the callers stack frame. Also replace inline assembly which grabs the stack pointer in save_stack_trace and show_stack with __get_SP(). This also fixes an issue with perf_arch_fetch_caller_regs(). It currently unwinds the stack once, which will skip a valid stack frame on a leaf function. With the __get_SP() fixes in this patch, we never need to unwind the stack frame to get to the first interesting frame. We have to export __get_SP() because perf_arch_fetch_caller_regs() (which is used in modules) calls it from a header file. Reported-by: Li Zhong Signed-off-by: Anton Blanchard Signed-off-by: Michael Ellerman

powerpc: switch to generic sys_execve()/kernel_execve()

2012-10-01T03:35:51Z

the only non-obvious part is that current_pt_regs() is really needed here - task_pt_regs() is NULL for kernel threads; it's OK for ptrace uses (the thing task_pt_regs() is intended for), but not for us. Signed-off-by: Al Viro

powerpc: Remove legacy iSeries bits from assembly files

2012-03-08T23:54:59Z

This removes the various bits of assembly in the kernel entry, exception handling and SLB management code that were specific to running under the legacy iSeries hypervisor which is no longer supported. Signed-off-by: Benjamin Herrenschmidt

powerpc: Remove unneeded cpu_setup/restore from POWER7 cputable entry

2010-11-29T04:48:22Z

These are not needed so just remove them Signed-off-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt

perf: Drop the skip argument from perf_arch_fetch_regs_caller

2010-06-08T21:31:27Z

Drop this argument now that we always want to rewind only to the state of the first caller. It means frame pointers are not necessary anymore to reliably get the source of an event. But this also means we need this helper to be a macro now, as an inline function is not an option since we need to know when to provide a default implentation. Signed-off-by: Frederic Weisbecker Signed-off-by: Paul Mackerras Cc: David Miller Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Arnaldo Carvalho de Melo