i386 vsyscall support (vdso-provided sysenter/syscall instruction based)

[musl] / src / internal / i386 / syscall.s

diff --git a/src/internal/i386/syscall.s b/src/internal/i386/syscall.s
index 327d4cc..79296ba 100644 (file)
--- 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