mirror of
git://git.musl-libc.org/musl
synced 2025-02-03 20:41:31 +00:00
5053fd2644
effectivly revert commitddc7c4f936which was wrong; it caused a major regression on Linux versions prior to 2.6.36. old kernels did not properly preserve r2 across syscall restart, and instead restarted with the instruction right before syscall, imposing a contract that the previous instruction must load r2 from an immediate or a register (or memory) not clobbered by the syscall. since other changes were made since, including removal of the struct stat conversion that was replaced by separate struct kstat, this is not a direct revert, only a functional one. the "0"(r2) input constraint added back seems useless/erroneous, but without it most gcc versions (seems to be all prior to 9.x) fail to honor the output register binding for r2. this seems to be a variant of gcc bug #87733. further changes should be made later if a better workaround is found, but this one has been working since 2012. it seems this issue was encountered but misidentified then, when it inspired commit4221f154ff.
129 lines
3.3 KiB
C
129 lines
3.3 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 __mips_isa_rev >= 6
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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", "memory"
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#else
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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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#endif
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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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"daddu $2,$0,%2 ; syscall"
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: "=&r"(r2), "=r"(r7)
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: "ir"(n), "0"(r2)
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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");
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__asm__ __volatile__ (
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"daddu $2,$0,%2 ; syscall"
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: "=&r"(r2), "=r"(r7)
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: "ir"(n), "0"(r2), "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");
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__asm__ __volatile__ (
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"daddu $2,$0,%2 ; syscall"
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: "=&r"(r2), "=r"(r7)
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: "ir"(n), "0"(r2), "r"(r4), "r"(r5)
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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 __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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"daddu $2,$0,%2 ; syscall"
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: "=&r"(r2), "=r"(r7)
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: "ir"(n), "0"(r2), "r"(r4), "r"(r5), "r"(r6)
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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 __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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"daddu $2,$0,%2 ; syscall"
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: "=&r"(r2), "+r"(r7)
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: "ir"(n), "0"(r2), "r"(r4), "r"(r5), "r"(r6)
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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 __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");
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__asm__ __volatile__ (
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"daddu $2,$0,%2 ; syscall"
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: "=&r"(r2), "+r"(r7)
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: "ir"(n), "0"(r2), "r"(r4), "r"(r5), "r"(r6), "r"(r8)
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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 __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");
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__asm__ __volatile__ (
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"daddu $2,$0,%2 ; syscall"
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: "=&r"(r2), "+r"(r7)
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: "ir"(n), "0"(r2), "r"(r4), "r"(r5), "r"(r6), "r"(r8), "r"(r9)
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: SYSCALL_CLOBBERLIST);
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return r7 ? -r2 : 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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#define SO_SNDTIMEO_OLD 0x1005
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#define SO_RCVTIMEO_OLD 0x1006
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