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They are not supposed to change flow control.
This fixes miscompilation with gcc 14.2.0 which then drops code, see
https://lists.gnu.org/archive/html/bug-hurd/2024-11/msg00145.html
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We're obtaining arguments from the stack differently, see init-first.c.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
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These are useless on x86_64, and __NGREG was actually wrong with them.
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The existing two macros, MACHINE_THREAD_STATE_SET_PC and
MACHINE_THREAD_STATE_SET_SP, can be used to set program counter and the
stack pointer registers in a machine-specific thread state structure.
Useful as it is, this may not be enough to set up the thread to make a
function call, because the machine-specific ABI may impose additional
requirements. In particular, x86_64 ABI requires that upon function
entry, the stack pointer is 8 less than 16-byte aligned (sp & 15 == 8).
To deal with this, introduce a new macro,
MACHINE_THREAD_STATE_SETUP_CALL (), which sets both stack and
instruction pointers, and also applies any machine-specific requirements
to make a valid function call. The default implementation simply
forwards to MACHINE_THREAD_STATE_SET_PC and MACHINE_THREAD_STATE_SET_SP,
but on x86_64 we additionally align the stack pointer.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230517191436.73636-3-bugaevc@gmail.com>
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Moved thread_state.h to x86 directory since we only need to customize
those 3 definitions.
Message-Id: <Y+x4xrsDMkAomncO@jupiter.tail36e24.ts.net>
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Message-Id: <Y99nfeBrTubZL9oi@jupiter.tail36e24.ts.net>
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As they will actually be usable on x86_64 too.
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