From d02e72ad51ea3b06cb168d872e3e5c126bb3df9d Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sun, 5 May 2019 11:24:57 -0400 Subject: [PATCH] fix broken posix_fadvise on mips due to missing 7-arg syscall support commit 788d5e24ca19c6291cebd8d1ad5b5ed6abf42665 exposed the breakage at build time by removing support for 7-argument syscalls; however, the external __syscall function provided for mips before did not pass a 7th argument from the stack, so the behavior was just silently broken. --- arch/mips/syscall_arch.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/arch/mips/syscall_arch.h b/arch/mips/syscall_arch.h index 3b33ce18..43bcdee7 100644 --- a/arch/mips/syscall_arch.h +++ b/arch/mips/syscall_arch.h @@ -147,6 +147,31 @@ static inline long __syscall6(long n, long a, long b, long c, long d, long e, lo return r2; } +static inline long __syscall7(long n, long a, long b, long c, long d, long e, long f, long g) +{ + register long r4 __asm__("$4") = a; + register long r5 __asm__("$5") = b; + register long r6 __asm__("$6") = c; + register long r7 __asm__("$7") = d; + register long r8 __asm__("$8") = e; + register long r9 __asm__("$9") = f; + register long r10 __asm__("$10") = g; + register long r2 __asm__("$2"); + __asm__ __volatile__ ( + "subu $sp,$sp,32 ; sw $8,16($sp) ; sw $9,20($sp) ; sw $10,24($sp) ; " + "addu $2,$0,%5 ; syscall ;" + "addu $sp,$sp,32" + : "=&r"(r2), "=r"(r7), "+r"(r8), "+r"(r9), "+r"(r10) + : "ir"(n), "0"(r2), "1"(r7), "r"(r4), "r"(r5), "r"(r6) + : "$1", "$3", "$11", "$12", "$13", + "$14", "$15", "$24", "$25", "hi", "lo", "memory"); + if (r7) return -r2; + long ret = r2; + if (n == SYS_stat64 || n == SYS_fstat64 || n == SYS_lstat64) __stat_fix(b); + if (n == SYS_fstatat64) __stat_fix(c); + return r2; +} + #define VDSO_USEFUL #define VDSO_CGT_SYM "__vdso_clock_gettime" #define VDSO_CGT_VER "LINUX_2.6" -- 2.25.1