mirror of git://sourceware.org/git/glibc.git
6bd82f5fd0
X32 has 32-bit long and pointer with 64-bit off_t. Since x32 psABI
requires that pointers passed in registers must be zero-extended to
64bit, x32 can share many syscall interfaces with LP64. When a LP64
syscall with long and unsigned long int arguments is used for x32, these
arguments must be properly extended to 64-bit. Otherwise if the upper
32 bits of the register have undefined value, such a syscall will be
rejected by kernel.
For syscalls implemented in assembly codes, 'U' is added to syscall
signature key letters for unsigned long, which is zero-extended to
64-bit types. SYSCALL_ULONG_ARG_1 and SYSCALL_ULONG_ARG_2 are passed
to syscall-template.S for the first and the second unsigned long int
arguments if PSEUDOS_HAVE_ULONG_INDICES is defined. They are used by
x32 to zero-extend 32-bit arguments to 64 bits.
Tested on i386, x86-64 and x32 as well as with build-many-glibcs.py.
(cherry picked from commit
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|---|---|---|
| .. | ||
| 64 | ||
| x32 | ||
| Implies | ||
| Makefile | ||
| Versions | ||
| ____longjmp_chk.S | ||
| __start_context.S | ||
| brk.c | ||
| cancellation.S | ||
| clone.S | ||
| compat-timer.h | ||
| configure | ||
| configure.ac | ||
| dl-cache.h | ||
| dl-procinfo.c | ||
| dl-procinfo.h | ||
| getcontext.S | ||
| init-first.c | ||
| ipc_priv.h | ||
| kernel-features.h | ||
| kernel_stat.h | ||
| ldconfig.h | ||
| ldd-rewrite.sed | ||
| libc-cancellation.S | ||
| libmvec.abilist | ||
| librt-cancellation.S | ||
| makecontext.c | ||
| profil-counter.h | ||
| pthread_setaffinity.c | ||
| readelflib.c | ||
| register-dump.h | ||
| sched_setaffinity.c | ||
| setcontext.S | ||
| sigaction.c | ||
| sigaltstack-offsets.sym | ||
| sigcontextinfo.h | ||
| sigprocmask.c | ||
| swapcontext.S | ||
| syscall.S | ||
| syscalls.list | ||
| sysdep.S | ||
| sysdep.h | ||
| timer_create.c | ||
| timer_delete.c | ||
| timer_getoverr.c | ||
| timer_gettime.c | ||
| timer_settime.c | ||
| ucontext_i.sym | ||
| vfork.S | ||