H.J. Lu 6bd82f5fd0 Add SYSCALL_ULONG_ARG_[12] to pass long to syscall [BZ #25810] ... 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 2ad5d0845d)		2020-05-07 05:12:27 -07:00
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linux	Add SYSCALL_ULONG_ARG_[12] to pass long to syscall [BZ #25810]	2020-05-07 05:12:27 -07:00