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25748db301
depending on the compiler's interpretation of __asm__ register names for register class objects, it may be possible for the return value in r2 to be clobbered by the function call to __stat_fix. I have not observed any such breakage in normal builds and suspect it only happens with -O0 or other unusual build options, but since there's an ambiguity as to the semantics of this feature, it's best to use an explicit temporary to avoid the issue. based on reporting and patch by Eugene.
163 lines
4.4 KiB
C
163 lines
4.4 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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long (__syscall)(long, ...);
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#define SYSCALL_RLIM_INFINITY (-1UL/2)
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#if _MIPSEL || __MIPSEL || __MIPSEL__
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#define __stat_fix(st) ((st),(void)0)
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#else
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#include <sys/stat.h>
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static inline void __stat_fix(long p)
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{
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struct stat *st = (struct stat *)p;
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st->st_dev >>= 32;
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st->st_rdev >>= 32;
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}
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#endif
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#ifndef __clang__
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static inline long __syscall0(long n)
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{
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register long r7 __asm__("$7");
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register long r2 __asm__("$2");
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__asm__ __volatile__ (
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"addu $2,$0,%2 ; syscall"
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: "=&r"(r2), "=r"(r7) : "ir"(n), "0"(r2), "1"(r7)
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: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
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"$14", "$15", "$24", "$25", "hi", "lo", "memory");
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return r7 ? -r2 : r2;
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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 r4 __asm__("$4") = a;
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register long r7 __asm__("$7");
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register long r2 __asm__("$2");
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__asm__ __volatile__ (
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"addu $2,$0,%2 ; syscall"
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: "=&r"(r2), "=r"(r7) : "ir"(n), "0"(r2), "1"(r7),
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"r"(r4)
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: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
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"$14", "$15", "$24", "$25", "hi", "lo", "memory");
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return r7 ? -r2 : r2;
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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 r4 __asm__("$4") = a;
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register long r5 __asm__("$5") = b;
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register long r7 __asm__("$7");
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register long r2 __asm__("$2");
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__asm__ __volatile__ (
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"addu $2,$0,%2 ; syscall"
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: "=&r"(r2), "=r"(r7) : "ir"(n), "0"(r2), "1"(r7),
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"r"(r4), "r"(r5)
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: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
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"$14", "$15", "$24", "$25", "hi", "lo", "memory");
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if (r7) return -r2;
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long ret = r2;
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if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
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return ret;
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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 r4 __asm__("$4") = a;
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register long r5 __asm__("$5") = b;
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register long r6 __asm__("$6") = c;
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register long r7 __asm__("$7");
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register long r2 __asm__("$2");
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__asm__ __volatile__ (
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"addu $2,$0,%2 ; syscall"
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: "=&r"(r2), "=r"(r7) : "ir"(n), "0"(r2), "1"(r7),
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"r"(r4), "r"(r5), "r"(r6)
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: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
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"$14", "$15", "$24", "$25", "hi", "lo", "memory");
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if (r7) return -r2;
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long ret = r2;
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if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
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return ret;
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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 r4 __asm__("$4") = a;
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register long r5 __asm__("$5") = b;
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register long r6 __asm__("$6") = c;
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register long r7 __asm__("$7") = d;
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register long r2 __asm__("$2");
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__asm__ __volatile__ (
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"addu $2,$0,%2 ; syscall"
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: "=&r"(r2), "=r"(r7) : "ir"(n), "0"(r2), "1"(r7),
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"r"(r4), "r"(r5), "r"(r6)
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: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13",
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"$14", "$15", "$24", "$25", "hi", "lo", "memory");
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if (r7) return -r2;
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long ret = r2;
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if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
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if (n == SYS_fstatat) __stat_fix(c);
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return ret;
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}
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#else
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static inline long __syscall0(long n)
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{
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return (__syscall)(n);
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}
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static inline long __syscall1(long n, long a)
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{
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return (__syscall)(n, a);
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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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long r2 = (__syscall)(n, a, b);
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if (r2 > -4096UL) return r2;
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if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
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return r2;
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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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long r2 = (__syscall)(n, a, b, c);
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if (r2 > -4096UL) return r2;
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if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
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return 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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long r2 = (__syscall)(n, a, b, c, d);
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if (r2 > -4096UL) return r2;
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if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
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if (n == SYS_fstatat) __stat_fix(c);
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return r2;
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}
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#endif
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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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long r2 = (__syscall)(n, a, b, c, d, e);
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if (r2 > -4096UL) return r2;
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if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
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if (n == SYS_fstatat) __stat_fix(c);
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return r2;
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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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long r2 = (__syscall)(n, a, b, c, d, e, f);
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if (r2 > -4096UL) return r2;
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if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b);
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if (n == SYS_fstatat) __stat_fix(c);
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return r2;
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}
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