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0cd2be2314
the mode member of struct ipc_perm is specified by POSIX to have type mode_t, which is uniformly defined as unsigned int. however, Linux defines it with type __kernel_mode_t, and defines __kernel_mode_t as unsigned short on some archs. since there is a subsequent padding field, treating it as a 32-bit unsigned int works on little endian archs, but the order is backwards on big endian archs with the erroneous definition. since multiple archs are affected, remedy the situation with fixup code in the affected functions (shmctl, semctl, and msgctl) rather than repeating the same shims in syscall_arch.h for every affected arch.
108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
#define __SYSCALL_LL_E(x) \
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((union { long long ll; long l[2]; }){ .ll = x }).l[0], \
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((union { long long ll; long l[2]; }){ .ll = x }).l[1]
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#define __SYSCALL_LL_O(x) 0, __SYSCALL_LL_E((x))
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#ifdef __thumb__
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/* Avoid use of r7 in asm constraints when producing thumb code,
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* since it's reserved as frame pointer and might not be supported. */
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#define __ASM____R7__
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#define __asm_syscall(...) do { \
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__asm__ __volatile__ ( "mov %1,r7 ; mov r7,%2 ; svc 0 ; mov r7,%1" \
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: "=r"(r0), "=&r"((int){0}) : __VA_ARGS__ : "memory"); \
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return r0; \
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} while (0)
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#else
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#define __ASM____R7__ __asm__("r7")
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#define __asm_syscall(...) do { \
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__asm__ __volatile__ ( "svc 0" \
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: "=r"(r0) : __VA_ARGS__ : "memory"); \
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return r0; \
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} while (0)
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#endif
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/* For thumb2, we can allow 8-bit immediate syscall numbers, saving a
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* register in the above dance around r7. Does not work for thumb1 where
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* only movs, not mov, supports immediates, and we can't use movs because
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* it doesn't support high regs. */
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#ifdef __thumb2__
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#define R7_OPERAND "rI"(r7)
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#else
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#define R7_OPERAND "r"(r7)
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#endif
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static inline long __syscall0(long n)
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{
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register long r7 __ASM____R7__ = n;
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register long r0 __asm__("r0");
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__asm_syscall(R7_OPERAND);
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}
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static inline long __syscall1(long n, long a)
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{
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register long r7 __ASM____R7__ = n;
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register long r0 __asm__("r0") = a;
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__asm_syscall(R7_OPERAND, "0"(r0));
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}
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static inline long __syscall2(long n, long a, long b)
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{
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register long r7 __ASM____R7__ = n;
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register long r0 __asm__("r0") = a;
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register long r1 __asm__("r1") = b;
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__asm_syscall(R7_OPERAND, "0"(r0), "r"(r1));
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}
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static inline long __syscall3(long n, long a, long b, long c)
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{
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register long r7 __ASM____R7__ = n;
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register long r0 __asm__("r0") = a;
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register long r1 __asm__("r1") = b;
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register long r2 __asm__("r2") = c;
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__asm_syscall(R7_OPERAND, "0"(r0), "r"(r1), "r"(r2));
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}
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static inline long __syscall4(long n, long a, long b, long c, long d)
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{
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register long r7 __ASM____R7__ = n;
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register long r0 __asm__("r0") = a;
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register long r1 __asm__("r1") = b;
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register long r2 __asm__("r2") = c;
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register long r3 __asm__("r3") = d;
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__asm_syscall(R7_OPERAND, "0"(r0), "r"(r1), "r"(r2), "r"(r3));
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}
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static inline long __syscall5(long n, long a, long b, long c, long d, long e)
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{
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register long r7 __ASM____R7__ = n;
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register long r0 __asm__("r0") = a;
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register long r1 __asm__("r1") = b;
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register long r2 __asm__("r2") = c;
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register long r3 __asm__("r3") = d;
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register long r4 __asm__("r4") = e;
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__asm_syscall(R7_OPERAND, "0"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4));
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}
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static inline long __syscall6(long n, long a, long b, long c, long d, long e, long f)
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{
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register long r7 __ASM____R7__ = n;
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register long r0 __asm__("r0") = a;
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register long r1 __asm__("r1") = b;
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register long r2 __asm__("r2") = c;
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register long r3 __asm__("r3") = d;
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register long r4 __asm__("r4") = e;
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register long r5 __asm__("r5") = f;
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__asm_syscall(R7_OPERAND, "0"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r5));
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}
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#define VDSO_USEFUL
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#define VDSO_CGT_SYM "__vdso_clock_gettime"
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#define VDSO_CGT_VER "LINUX_2.6"
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#define SYSCALL_FADVISE_6_ARG
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#define SYSCALL_IPC_BROKEN_MODE
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