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| author | Rich Felker <dalias@aerifal.cx> | 2012-10-11 22:47:07 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2012-10-11 22:47:07 -0400 |
| commit | 12e9b4faf68a1a02ebf5ad69c03ac10f170f14cb (patch) | |
| tree | f206db332e670791be0120cb21cc5eee9bc23574 /src/internal | |
| parent | f2b1f1af83e96f8f98fbf2a5c663d8d058f2a66d (diff) | |
| download | musl-12e9b4faf68a1a02ebf5ad69c03ac10f170f14cb.tar.gz musl-12e9b4faf68a1a02ebf5ad69c03ac10f170f14cb.tar.xz musl-12e9b4faf68a1a02ebf5ad69c03ac10f170f14cb.zip | |
i386 vsyscall support (vdso-provided sysenter/syscall instruction based)
this doubles the performance of the fastest syscalls on the atom I tested it on; improvement is reportedly much more dramatic on worst-case cpus. cannot be used for cancellable syscalls.
Diffstat (limited to 'src/internal')
| -rw-r--r-- | src/internal/i386/syscall.s | 74 | ||||
| -rw-r--r-- | src/internal/libc.c | 1 |
2 files changed, 59 insertions, 16 deletions
diff --git a/src/internal/i386/syscall.s b/src/internal/i386/syscall.s index 327d4cc0..79296ba0 100644 --- a/src/internal/i386/syscall.s +++ b/src/internal/i386/syscall.s @@ -1,20 +1,62 @@ +.hidden __sysinfo + +.global __vsyscall +.type __vsyscall,@function +__vsyscall: + push %edi + push %ebx + mov %edx,%ebx + mov %edi,%edx + mov 12(%esp),%edi + push %eax + call 1f +2: pop %ebx + pop %ebx + pop %edi + ret + +1: mov (%esp),%eax + add $[__sysinfo-2b],%eax + mov (%eax),%eax + test %eax,%eax + jz 1f + push %eax + mov 8(%esp),%eax + ret +1: mov 4(%esp),%eax + int $128 + ret + +.global __vsyscall6 +.type __vsyscall6,@function +__vsyscall6: + push %ebp + push %eax + mov 12(%esp), %ebp + mov (%ebp), %eax + mov 4(%ebp), %ebp + push %eax + mov 4(%esp),%eax + call __vsyscall + pop %ebp + pop %ebp + pop %ebp + ret + .global __syscall .type __syscall,@function __syscall: - pushl %ebx - pushl %esi - pushl %edi - pushl %ebp - movl 20(%esp),%eax - movl 24(%esp),%ebx - movl 28(%esp),%ecx - movl 32(%esp),%edx - movl 36(%esp),%esi - movl 40(%esp),%edi - movl 44(%esp),%ebp - int $128 - popl %ebp - popl %edi - popl %esi - popl %ebx + lea 24(%esp),%eax + push %esi + push %edi + push %eax + mov 16(%esp),%eax + mov 20(%esp),%edx + mov 24(%esp),%ecx + mov 28(%esp),%edi + mov 32(%esp),%esi + call __vsyscall6 + pop %edi + pop %edi + pop %esi ret diff --git a/src/internal/libc.c b/src/internal/libc.c index 004c1a33..d22d2747 100644 --- a/src/internal/libc.c +++ b/src/internal/libc.c @@ -15,3 +15,4 @@ __asm__(".hidden __libc"); #endif size_t __hwcap; +size_t __sysinfo; |