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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.
This commit is contained in:
H.J. Lu
parent
9207e30d3f
commit
2ad5d0845d
@ -30,6 +30,7 @@
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# P: optionally-NULL pointer to typed object (e.g., 3rd argument to sigaction)
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# s: non-NULL string (e.g., 1st arg to open)
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# S: optionally-NULL string (e.g., 1st arg to acct)
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# U: unsigned long int (32-bit types are zero-extended to 64-bit types)
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# v: vararg scalar (e.g., optional 3rd arg to open)
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# V: byte-per-page vector (3rd arg to mincore)
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# W: wait status, optionally-NULL pointer to int (e.g., 2nd arg of wait4)
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@ -184,6 +185,27 @@ while read file srcfile caller syscall args strong weak; do
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?:?????????) nargs=9;;
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esac
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# Derive the unsigned long int arguments from the argument signature
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ulong_arg_1=0
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ulong_arg_2=0
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ulong_count=0
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for U in $(echo $args | sed -e "s/.*:/:/" | grep -ob U)
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do
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ulong_count=$(expr $ulong_count + 1)
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ulong_arg=$(echo $U | sed -e "s/:U//")
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case $ulong_count in
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1)
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ulong_arg_1=$ulong_arg
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;;
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2)
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ulong_arg_2=$ulong_arg
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;;
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*)
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echo >&2 "$0: Too many unsigned long int arguments for syscall ($strong $weak)"
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exit 2
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esac
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done
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# Make sure only the first syscall rule is used, if multiple dirs
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# define the same syscall.
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echo ''
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@ -245,6 +267,8 @@ while read file srcfile caller syscall args strong weak; do
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\$(make-target-directory)
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(echo '#define SYSCALL_NAME $syscall'; \\
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echo '#define SYSCALL_NARGS $nargs'; \\
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echo '#define SYSCALL_ULONG_ARG_1 $ulong_arg_1'; \\
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echo '#define SYSCALL_ULONG_ARG_2 $ulong_arg_2'; \\
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echo '#define SYSCALL_SYMBOL $strong'; \\
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echo '#define SYSCALL_NOERRNO $noerrno'; \\
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echo '#define SYSCALL_ERRVAL $errval'; \\
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@ -25,6 +25,12 @@
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defining a few macros:
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SYSCALL_NAME syscall name
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SYSCALL_NARGS number of arguments this call takes
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SYSCALL_ULONG_ARG_1 the first unsigned long int argument this
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call takes. 0 means that there are no
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unsigned long int arguments.
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SYSCALL_ULONG_ARG_2 the second unsigned long int argument this
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call takes. 0 means that there is at most
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one unsigned long int argument.
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SYSCALL_SYMBOL primary symbol name
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SYSCALL_NOERRNO 1 to define a no-errno version (see below)
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SYSCALL_ERRVAL 1 to define an error-value version (see below)
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@ -44,9 +50,31 @@
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/* This indirection is needed so that SYMBOL gets macro-expanded. */
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#define syscall_hidden_def(SYMBOL) hidden_def (SYMBOL)
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#define T_PSEUDO(SYMBOL, NAME, N) PSEUDO (SYMBOL, NAME, N)
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#define T_PSEUDO_NOERRNO(SYMBOL, NAME, N) PSEUDO_NOERRNO (SYMBOL, NAME, N)
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#define T_PSEUDO_ERRVAL(SYMBOL, NAME, N) PSEUDO_ERRVAL (SYMBOL, NAME, N)
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/* If PSEUDOS_HAVE_ULONG_INDICES is defined, PSEUDO and T_PSEUDO macros
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have 2 extra arguments for unsigned long int arguments:
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Extra argument 1: Position of the first unsigned long int argument.
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Extra argument 2: Position of the second unsigned long int argument.
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*/
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#ifndef PSEUDOS_HAVE_ULONG_INDICES
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# undef SYSCALL_ULONG_ARG_1
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# define SYSCALL_ULONG_ARG_1 0
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#endif
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#if SYSCALL_ULONG_ARG_1
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# define T_PSEUDO(SYMBOL, NAME, N, U1, U2) \
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PSEUDO (SYMBOL, NAME, N, U1, U2)
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# define T_PSEUDO_NOERRNO(SYMBOL, NAME, N, U1, U2) \
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PSEUDO_NOERRNO (SYMBOL, NAME, N, U1, U2)
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# define T_PSEUDO_ERRVAL(SYMBOL, NAME, N, U1, U2) \
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PSEUDO_ERRVAL (SYMBOL, NAME, N, U1, U2)
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#else
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# define T_PSEUDO(SYMBOL, NAME, N) \
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PSEUDO (SYMBOL, NAME, N)
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# define T_PSEUDO_NOERRNO(SYMBOL, NAME, N) \
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PSEUDO_NOERRNO (SYMBOL, NAME, N)
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# define T_PSEUDO_ERRVAL(SYMBOL, NAME, N) \
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PSEUDO_ERRVAL (SYMBOL, NAME, N)
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#endif
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#define T_PSEUDO_END(SYMBOL) PSEUDO_END (SYMBOL)
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#define T_PSEUDO_END_NOERRNO(SYMBOL) PSEUDO_END_NOERRNO (SYMBOL)
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#define T_PSEUDO_END_ERRVAL(SYMBOL) PSEUDO_END_ERRVAL (SYMBOL)
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@ -56,7 +84,12 @@
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/* This kind of system call stub never returns an error.
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We return the return value register to the caller unexamined. */
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# if SYSCALL_ULONG_ARG_1
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T_PSEUDO_NOERRNO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS,
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SYSCALL_ULONG_ARG_1, SYSCALL_ULONG_ARG_2)
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# else
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T_PSEUDO_NOERRNO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
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# endif
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ret_NOERRNO
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T_PSEUDO_END_NOERRNO (SYSCALL_SYMBOL)
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@ -66,7 +99,12 @@ T_PSEUDO_END_NOERRNO (SYSCALL_SYMBOL)
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value, or zero for success. We may massage the kernel's return value
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to meet that ABI, but we never set errno here. */
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# if SYSCALL_ULONG_ARG_1
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T_PSEUDO_ERRVAL (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS,
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SYSCALL_ULONG_ARG_1, SYSCALL_ULONG_ARG_2)
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# else
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T_PSEUDO_ERRVAL (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
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# endif
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ret_ERRVAL
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T_PSEUDO_END_ERRVAL (SYSCALL_SYMBOL)
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@ -75,7 +113,12 @@ T_PSEUDO_END_ERRVAL (SYSCALL_SYMBOL)
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/* This is a "normal" system call stub: if there is an error,
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it returns -1 and sets errno. */
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# if SYSCALL_ULONG_ARG_1
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T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS,
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SYSCALL_ULONG_ARG_1, SYSCALL_ULONG_ARG_2)
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# else
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T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
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# endif
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ret
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T_PSEUDO_END (SYSCALL_SYMBOL)
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@ -37,16 +37,16 @@ kill - kill i:ii __kill kill
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link - link i:ss __link link
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listen - listen i:ii __listen listen
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lseek - lseek i:iii __libc_lseek __lseek lseek
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madvise - madvise i:pii __madvise madvise
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madvise - madvise i:pUi __madvise madvise
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mkdir - mkdir i:si __mkdir mkdir
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mmap - mmap b:aniiii __mmap mmap
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mprotect - mprotect i:aii __mprotect mprotect
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munmap - munmap i:ai __munmap munmap
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mprotect - mprotect i:aUi __mprotect mprotect
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munmap - munmap i:aU __munmap munmap
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open - open Ci:siv __libc_open __open open
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profil - profil i:piii __profil profil
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ptrace - ptrace i:iiii ptrace
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read - read Ci:ibn __libc_read __read read
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readlink - readlink i:spi __readlink readlink
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readlink - readlink i:spU __readlink readlink
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readv - readv Ci:ipi __readv readv
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reboot - reboot i:i reboot
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recv - recv Ci:ibni __libc_recv recv
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@ -32,12 +32,12 @@ ioperm - ioperm i:iii ioperm
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iopl - iopl i:i iopl
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klogctl EXTRA syslog i:isi klogctl
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lchown - lchown i:sii __lchown lchown
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mincore - mincore i:anV mincore
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mlock - mlock i:bn mlock
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mincore - mincore i:aUV mincore
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mlock - mlock i:bU mlock
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mlockall - mlockall i:i mlockall
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mount EXTRA mount i:sssip __mount mount
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mremap EXTRA mremap b:ainip __mremap mremap
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munlock - munlock i:ai munlock
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mount EXTRA mount i:sssUp __mount mount
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mremap EXTRA mremap b:aUUip __mremap mremap
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munlock - munlock i:aU munlock
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munlockall - munlockall i: munlockall
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nfsservctl EXTRA nfsservctl i:ipp __compat_nfsservctl nfsservctl@GLIBC_2.0:GLIBC_2.28
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pipe - pipe i:f __pipe pipe
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@ -46,7 +46,7 @@ pivot_root EXTRA pivot_root i:ss pivot_root
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prctl EXTRA prctl i:iiiii __prctl prctl
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query_module EXTRA query_module i:sipip __compat_query_module query_module@GLIBC_2.0:GLIBC_2.23
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quotactl EXTRA quotactl i:isip quotactl
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remap_file_pages - remap_file_pages i:piiii __remap_file_pages remap_file_pages
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remap_file_pages - remap_file_pages i:pUiUi __remap_file_pages remap_file_pages
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sched_getp - sched_getparam i:ip __sched_getparam sched_getparam
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sched_gets - sched_getscheduler i:i __sched_getscheduler sched_getscheduler
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sched_primax - sched_get_priority_max i:i __sched_get_priority_max sched_get_priority_max
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@ -54,7 +54,7 @@ sched_primin - sched_get_priority_min i:i __sched_get_priority_min sched_get_pri
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sched_setp - sched_setparam i:ip __sched_setparam sched_setparam
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sched_sets - sched_setscheduler i:iip __sched_setscheduler sched_setscheduler
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sched_yield - sched_yield i: __sched_yield sched_yield
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sendfile - sendfile i:iipi sendfile
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sendfile - sendfile i:iipU sendfile
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sendfile64 - sendfile64 i:iipi sendfile64
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setfsgid EXTRA setfsgid i:i setfsgid
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setfsuid EXTRA setfsuid i:i setfsuid
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@ -71,7 +71,7 @@ chown - chown i:sii __libc_chown __chown chown
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fchownat - fchownat i:isiii fchownat
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linkat - linkat i:isisi linkat
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mkdirat - mkdirat i:isi mkdirat
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readlinkat - readlinkat i:issi readlinkat
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readlinkat - readlinkat i:issU readlinkat
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symlinkat - symlinkat i:sis symlinkat
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unlinkat - unlinkat i:isi unlinkat
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@ -57,13 +57,31 @@
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# define SYSCALL_ERROR_LABEL syscall_error
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# endif
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/* PSEUDO and T_PSEUDO macros have 2 extra arguments for unsigned long
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int arguments. */
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# define PSEUDOS_HAVE_ULONG_INDICES 1
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# ifndef SYSCALL_ULONG_ARG_1
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# define SYSCALL_ULONG_ARG_1 0
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# define SYSCALL_ULONG_ARG_2 0
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# endif
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args); \
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cmpq $-4095, %rax; \
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# if SYSCALL_ULONG_ARG_1
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# define PSEUDO(name, syscall_name, args, ulong_arg_1, ulong_arg_2) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args, ulong_arg_1, ulong_arg_2); \
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cmpq $-4095, %rax; \
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jae SYSCALL_ERROR_LABEL
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# else
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# define PSEUDO(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args, 0, 0); \
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cmpq $-4095, %rax; \
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jae SYSCALL_ERROR_LABEL
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# endif
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# undef PSEUDO_END
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# define PSEUDO_END(name) \
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@ -71,10 +89,17 @@
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END (name)
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# undef PSEUDO_NOERRNO
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# define PSEUDO_NOERRNO(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args)
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# if SYSCALL_ULONG_ARG_1
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# define PSEUDO_NOERRNO(name, syscall_name, args, ulong_arg_1, ulong_arg_2) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args, ulong_arg_1, ulong_arg_2)
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# else
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# define PSEUDO_NOERRNO(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args, 0, 0)
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# endif
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# undef PSEUDO_END_NOERRNO
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# define PSEUDO_END_NOERRNO(name) \
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@ -83,11 +108,19 @@
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# define ret_NOERRNO ret
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# undef PSEUDO_ERRVAL
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# define PSEUDO_ERRVAL(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args); \
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# if SYSCALL_ULONG_ARG_1
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# define PSEUDO_ERRVAL(name, syscall_name, args, ulong_arg_1, ulong_arg_2) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args, ulong_arg_1, ulong_arg_2); \
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negq %rax
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# else
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# define PSEUDO_ERRVAL(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args, 0, 0); \
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negq %rax
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# endif
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# undef PSEUDO_END_ERRVAL
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# define PSEUDO_END_ERRVAL(name) \
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@ -159,8 +192,10 @@
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Syscalls of more than 6 arguments are not supported. */
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# undef DO_CALL
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# define DO_CALL(syscall_name, args) \
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# define DO_CALL(syscall_name, args, ulong_arg_1, ulong_arg_2) \
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DOARGS_##args \
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ZERO_EXTEND_##ulong_arg_1 \
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ZERO_EXTEND_##ulong_arg_2 \
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movl $SYS_ify (syscall_name), %eax; \
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syscall;
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@ -172,6 +207,14 @@
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# define DOARGS_5 DOARGS_4
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# define DOARGS_6 DOARGS_5
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# define ZERO_EXTEND_0 /* nothing */
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# define ZERO_EXTEND_1 /* nothing */
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# define ZERO_EXTEND_2 /* nothing */
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# define ZERO_EXTEND_3 /* nothing */
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# define ZERO_EXTEND_4 /* nothing */
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# define ZERO_EXTEND_5 /* nothing */
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# define ZERO_EXTEND_6 /* nothing */
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#else /* !__ASSEMBLER__ */
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/* Registers clobbered by syscall. */
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@ -26,7 +26,26 @@
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#undef LO_HI_LONG
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#define LO_HI_LONG(val) (val)
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#ifndef __ASSEMBLER__
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#ifdef __ASSEMBLER__
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/* Zero-extend 32-bit unsigned long int arguments to 64 bits. */
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# undef ZERO_EXTEND_1
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# define ZERO_EXTEND_1 movl %edi, %edi;
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# undef ZERO_EXTEND_2
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# define ZERO_EXTEND_2 movl %esi, %esi;
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# undef ZERO_EXTEND_3
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# define ZERO_EXTEND_3 movl %edx, %edx;
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# if SYSCALL_ULONG_ARG_1 == 4 || SYSCALL_ULONG_ARG_2 == 4
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# undef DOARGS_4
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# define DOARGS_4 movl %ecx, %r10d;
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# else
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# undef ZERO_EXTEND_4
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# define ZERO_EXTEND_4 movl %r10d, %r10d;
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# endif
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# undef ZERO_EXTEND_5
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# define ZERO_EXTEND_5 movl %r8d, %r8d;
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# undef ZERO_EXTEND_6
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# define ZERO_EXTEND_6 movl %r9d, %r9d;
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#else /* !__ASSEMBLER__ */
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# undef ARGIFY
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/* Enforce zero-extension for pointers and array system call arguments.
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For integer types, extend to int64_t (the full register) using a
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