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| author | Sergey Bugaev <bugaevc@gmail.com> | 2023-05-17 22:14:28 +0300 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2023-05-17 22:52:39 +0200 |
| commit | 4a373ea7d677c69dc95903dbb542237ab1380eb5 (patch) | |
| tree | 27f0d9d478bf4fc513dbaaa0aa5f2a7afe9f15c8 /sysdeps/mach/thread_state.h | |
| parent | 3f7b800d54eb67d9b97f6e0933275155fdf13c70 (diff) | |
| download | glibc-4a373ea7d677c69dc95903dbb542237ab1380eb5.tar.xz glibc-4a373ea7d677c69dc95903dbb542237ab1380eb5.zip | |
mach: Define MACHINE_THREAD_STATE_SETUP_CALL
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>
Diffstat (limited to 'sysdeps/mach/thread_state.h')
| -rw-r--r-- | sysdeps/mach/thread_state.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/sysdeps/mach/thread_state.h b/sysdeps/mach/thread_state.h index 9fa3d4e161..431aaf82ed 100644 --- a/sysdeps/mach/thread_state.h +++ b/sysdeps/mach/thread_state.h @@ -38,6 +38,15 @@ #endif #endif +/* Set up the thread state to call the given function on the given state. + Dependning on architecture, this may imply more than just setting PC + and SP. */ +#ifndef MACHINE_THREAD_STATE_SETUP_CALL +#define MACHINE_THREAD_STATE_SETUP_CALL(ts, stack, size, func) \ + (MACHINE_THREAD_STATE_SET_PC (ts, func), \ + MACHINE_THREAD_STATE_SET_SP (ts, stack, size)) +#endif + /* This copies architecture-specific bits from the current thread to the new thread state. */ #ifndef MACHINE_THREAD_STATE_FIX_NEW |