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Only works in uretprobes for the moment.
* runtime/stack-x86_64.c (__stp_stack_print): Rewrite trampoline PC
addresses if necessary.
* runtime/stack-i386.c (__stp_stack_print): ditto
* runtime/stack-arm.c (__stp_stack_print): Add extra argument
* runtime/stack-ppc.c (__stp_stack_print): ditto
* runtime/stack-s390.c (__stp_stack_print): ditto
* runtime/stack.c (_stap_stack_print): call __stp_stack_print with
uretprobe_instance.
* testsuite/systemtap.context/uprobe_backtrace.stp: new test
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* runtime/stack-arm.c (__stp_stack_print): Take struct task_struct *.
* runtime/stack-ia64.c (__stp_stack_print): Likewise.
* runtime/stack-ppc64.c (__stp_stack_print): Likewise.
* runtime/stack-s390.c (__stp_stack_print): Likewise.
* runtime/stack-i386.c (__stp_stack_print): Likewise.
And add check and pass to unwind() and _stp_func_print().
* runtime/stack-x86_64.c: Likewise.
* runtime/stack.c *_stp_stack_print): Take and pass on task_struct.
(_stp_stack_snprint): Likewise.
* runtime/unwind.c (unwind): Take and use task_struct for
_stp_mod_sec_lookup().
* tapset/context-unwind.stp (print_backtrace): Pass NULL to
_stp_stack_print().
(backtrace): Pass NULL to _stp_stack_snprint().
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From Quentin Barnes.
* loc2c-runtime.h: Latest arm marcos.
* stack-arm.c (__stp_stack_print): Add a cast.
* regs.c (_stp_ret_addr): Define for arm.
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Patch from Quentin Barnes.
* arith.c: Add arm support for 64-bit division.
* copy.c: Enable arm support.
* loc2c-runtime.h: Ditto.
* regs.[ch]: Ditto.
* stack.c: Include stack-arm.c.
* stack-arm.c: New file.
* time.c (_stp_gettimeofday_ns): hack
for arm. See PR 4569.
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