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604f8d3d8b
analogous to commit ddc7c4f936 for
mips64 and n32, remove the hack to load the syscall number into $2 via
asm, and use a constraint to let the compiler load it instead.
now, only $4, $5, and $6 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.
as before, $8, $9, and $10 are conditionally input-output registers
for 5-, 6-, and 7-argument syscalls. their role in input is carrying
in the values that will be stored on the stack for arguments 5-7.
their role in output is carrying back whatever the kernel has
clobbered them with, so that the compiler cannot assume they still
contain the input values.
150 lines
4.0 KiB
C
150 lines
4.0 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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#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", "$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", "$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") = 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, "$8", "$9", "$10");
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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, "$8", "$9", "$10");
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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, "$8", "$9", "$10");
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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") = 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, "$8", "$9", "$10");
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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") = 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, "$8", "$9", "$10");
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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") = n;
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__asm__ __volatile__ (
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"subu $sp,$sp,32 ; sw $8,16($sp) ; "
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"syscall ;"
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"addu $sp,$sp,32"
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: "+r"(r2), "+r"(r7), "+r"(r8)
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: "r"(r4), "r"(r5), "r"(r6)
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: SYSCALL_CLOBBERLIST, "$9", "$10");
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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") = n;
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__asm__ __volatile__ (
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"subu $sp,$sp,32 ; sw $8,16($sp) ; sw $9,20($sp) ; "
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"syscall ;"
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"addu $sp,$sp,32"
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: "+r"(r2), "+r"(r7), "+r"(r8), "+r"(r9)
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: "r"(r4), "r"(r5), "r"(r6)
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: SYSCALL_CLOBBERLIST, "$10");
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return r7 ? -r2 : r2;
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}
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static inline long __syscall7(long n, long a, long b, long c, long d, long e, long f, long g)
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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 r10 __asm__("$10") = g;
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register long r2 __asm__("$2") = n;
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__asm__ __volatile__ (
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"subu $sp,$sp,32 ; sw $8,16($sp) ; sw $9,20($sp) ; sw $10,24($sp) ; "
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"syscall ;"
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"addu $sp,$sp,32"
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: "+r"(r2), "+r"(r7), "+r"(r8), "+r"(r9), "+r"(r10)
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: "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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#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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