CVS log for src/lib/libc/arch/i386/sys/__sigtramp2.S

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Default branch: MAIN

Restore ESP from mcontext

Improves unwinding of multiple frames without base pointer.

Decorate the i386 signal trampoline with CFI attributes easing unwinding

Now, the unwinders (in backtrace(3) and similar) can unwind properly
the stack from a signal handler.

Rebase to HEAD as of a few days ago.

Rebase.

Put missing END() markers to set ELF symbol size.

sync with head.

Remove clause 3 and 4 from TNF licenses

file __sigtramp2.S was added on branch christos-time_t on 2008-04-28 20:22:57 +0000

Remove clause 3 and 4 from TNF licenses

if setcontext(2) returns, _exit(2) with a return code of -1 instead
of relying on a sensible return value

Pull up following revision(s) (requested by jld in ticket #10667):
	lib/libc/arch/i386/sys/__sigtramp2.S: revision 1.2
Fix PR 34112, where a program could mysteriously exit on return from a
signal handler, by deriving the context pointer from the stack pointer
instead of trying to read it from where the sigaction function may have
overwritten it with arbitrary bits.
Fix provided by Matthias Drochner in the PR.

Pull up following revision(s) (requested by jld in ticket #10667):
	lib/libc/arch/i386/sys/__sigtramp2.S: revision 1.2
Fix PR 34112, where a program could mysteriously exit on return from a
signal handler, by deriving the context pointer from the stack pointer
instead of trying to read it from where the sigaction function may have
overwritten it with arbitrary bits.
Fix provided by Matthias Drochner in the PR.

Pull up following revision(s) (requested by jld in ticket #10667):
	lib/libc/arch/i386/sys/__sigtramp2.S: revision 1.2
Fix PR 34112, where a program could mysteriously exit on return from a
signal handler, by deriving the context pointer from the stack pointer
instead of trying to read it from where the sigaction function may have
overwritten it with arbitrary bits.
Fix provided by Matthias Drochner in the PR.

Pull up following revision(s) (requested by jld in ticket #1447):
	lib/libc/arch/i386/sys/__sigtramp2.S: revision 1.2
Fix PR 34112, where a program could mysteriously exit on return from a
signal handler, by deriving the context pointer from the stack pointer
instead of trying to read it from where the sigaction function may have
overwritten it with arbitrary bits.
Fix provided by Matthias Drochner in the PR.

Pull up following revision(s) (requested by jld in ticket #1447):
	lib/libc/arch/i386/sys/__sigtramp2.S: revision 1.2
Fix PR 34112, where a program could mysteriously exit on return from a
signal handler, by deriving the context pointer from the stack pointer
instead of trying to read it from where the sigaction function may have
overwritten it with arbitrary bits.
Fix provided by Matthias Drochner in the PR.

Fix PR 34112, where a program could mysteriously exit on return from a
signal handler, by deriving the context pointer from the stack pointer
instead of trying to read it from where the sigaction function may have
overwritten it with arbitrary bits.

Fix provided by Matthias Drochner in the PR.

siginfo signal trampoline code.