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* [Bug libc/32051] New: getcontext/swapcontext/setcontext unnecessarely save and restore argument passing registers on SysV x86-64
@ 2024-08-04 11:59 stefanoguerrini93 at gmail dot com
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From: stefanoguerrini93 at gmail dot com @ 2024-08-04 11:59 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=32051
Bug ID: 32051
Summary: getcontext/swapcontext/setcontext unnecessarely save
and restore argument passing registers on SysV x86-64
Product: glibc
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: libc
Assignee: unassigned at sourceware dot org
Reporter: stefanoguerrini93 at gmail dot com
CC: drepper.fsp at gmail dot com
Target Milestone: ---
Target: x86-64
The getcontext/swapcontext/setcontext functions save (restore) the
RDI/RSI/RDX/RCX/R8/R9 registers for the current (target) context. However,
according to the SysV x86-64 ABI these registers are not required to be
preserved across function calls.
I think that these registers shall be restored only for the first call of the
context created via the makecontext().
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2024-08-04 11:59 [Bug libc/32051] New: getcontext/swapcontext/setcontext unnecessarely save and restore argument passing registers on SysV x86-64 stefanoguerrini93 at gmail dot com
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