mirror of
git://git.musl-libc.org/musl
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ddc7c4f936
ever since inline syscalls were added for (o32) mips in commit328810d325, the asm has nonsensically loaded the syscall number, rather than taking $2 as an input constraint to let the compiler load it. commitcfc09b1ecfimproved on this somewhat by allowing a constant syscall number to propagate into an immediate, but missed that the whole operation made no sense. now, only $4, $5, $6, $8, and $9 are potential input-only registers. $2 is always input and output, and $7 is both when it's an argument, otherwise output-only. previously, $7 was treated as an input (with a "1" constraint matching its output position) even when it was not an input, which was arguably undefined behavior (asm input from indeterminate value). this is corrected.
141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
#define __SYSCALL_LL_E(x) (x)
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#define __SYSCALL_LL_O(x) (x)
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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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#define SYSCALL_CLOBBERLIST \
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"$1", "$3", "$10", "$11", "$12", "$13", \
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"$14", "$15", "$24", "$25", "hi", "lo", "memory"
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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") = n;
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__asm__ __volatile__ (
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"syscall"
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: "+&r"(r2), "=r"(r7)
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:
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: SYSCALL_CLOBBERLIST);
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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") = n;
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__asm__ __volatile__ (
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"syscall"
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: "+&r"(r2), "=r"(r7)
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: "r"(r4)
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: SYSCALL_CLOBBERLIST);
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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") = n;
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__asm__ __volatile__ (
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"syscall"
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: "+&r"(r2), "=r"(r7)
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: "r"(r4), "r"(r5)
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: SYSCALL_CLOBBERLIST);
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if (r7) return -r2;
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long ret = r2;
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if (n == SYS_stat || n == SYS_fstat || n == SYS_lstat) __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") = n;
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__asm__ __volatile__ (
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"syscall"
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: "+&r"(r2), "=r"(r7)
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: "r"(r4), "r"(r5), "r"(r6)
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: SYSCALL_CLOBBERLIST);
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if (r7) return -r2;
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long ret = r2;
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if (n == SYS_stat || n == SYS_fstat || n == SYS_lstat) __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") = n;
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__asm__ __volatile__ (
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"syscall"
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: "+&r"(r2), "+r"(r7)
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: "r"(r4), "r"(r5), "r"(r6)
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: SYSCALL_CLOBBERLIST);
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if (r7) return -r2;
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long ret = r2;
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if (n == SYS_stat || n == SYS_fstat || n == SYS_lstat) __stat_fix(b);
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if (n == SYS_newfstatat) __stat_fix(c);
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return ret;
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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 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 r8 __asm__("$8") = e;
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register long r2 __asm__("$2") = n;
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__asm__ __volatile__ (
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"syscall"
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: "+&r"(r2), "+r"(r7)
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: "r"(r4), "r"(r5), "r"(r6), "r"(r8)
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: SYSCALL_CLOBBERLIST);
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if (n == SYS_stat || n == SYS_fstat || n == SYS_lstat) __stat_fix(b);
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if (n == SYS_newfstatat) __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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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 r8 __asm__("$8") = e;
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register long r9 __asm__("$9") = f;
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register long r2 __asm__("$2") = n;
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__asm__ __volatile__ (
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"syscall"
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: "+&r"(r2), "+r"(r7)
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: "r"(r4), "r"(r5), "r"(r6), "r"(r8), "r"(r9)
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: SYSCALL_CLOBBERLIST);
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if (n == SYS_stat || n == SYS_fstat || n == SYS_lstat) __stat_fix(b);
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if (n == SYS_newfstatat) __stat_fix(c);
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return r2;
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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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