mirror of
https://git.musl-libc.org/git/musl
synced 2025-02-04 04:14:03 +03:00
f61be1f875
the mips version of this structure on the kernel side wrongly has 32-bit type rather than 64-bit type. fortunately there is adjacent padding to bring it up to 64 bits, and on little-endian, this allows us to treat the adjacent kernel st_dev and st_pad0[0] as as single 64-bit dev_t. however, on big endian, such treatment results in the upper and lower 32-bit parts of the dev_t value being swapped. for the purpose of just comparing st_dev values this did not break anything, but it precluded actually processing the device numbers as major/minor values. since the broken kernel behavior that needs to be worked around is isolated to one arch, I put the workarounds in syscall_arch.h rather than adding a stat fixup path in the common code. on little endian mips, the added code optimizes out completely. the changes necessary were incompatible with the way the __asm_syscall macro was factored so I just removed it and flattened the individual __syscallN functions. this arguably makes the code easier to read and understand, anyway.
160 lines
4.4 KiB
C
160 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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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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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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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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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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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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#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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