diff options
Diffstat (limited to 'sysdeps/unix/sysv/solaris2/kopensolaris-gnu')
| -rw-r--r-- | sysdeps/unix/sysv/solaris2/kopensolaris-gnu/x86_64/syscall.S | 41 |
1 files changed, 36 insertions, 5 deletions
diff --git a/sysdeps/unix/sysv/solaris2/kopensolaris-gnu/x86_64/syscall.S b/sysdeps/unix/sysv/solaris2/kopensolaris-gnu/x86_64/syscall.S index b08a194426..acdad259c6 100644 --- a/sysdeps/unix/sysv/solaris2/kopensolaris-gnu/x86_64/syscall.S +++ b/sysdeps/unix/sysv/solaris2/kopensolaris-gnu/x86_64/syscall.S @@ -19,13 +19,44 @@ #include <sysdep.h> +/* Usage: long syscall(syscall_number, arg1, arg2, arg3, arg4, arg5, arg6, ...) + We need to do some arg shifting, the syscall_number will be in rax. */ + .text; ENTRY (__syscall) - popl %rcx /* Pop return address into %rcx. */ - popl %eax /* Pop syscall number into %eax. */ - pushl %rcx /* Push back return adderss. */ - syscall /* Do the system call. */ - pushl %rcx /* Push back return address. */ + /* We move args in stack, so cannot use rsp - use rbp. */ + pushq %rbp; cfi_adjust_cfa_offset(8) + movq %rsp, %rbp + + /* Move arguments, just like in subcalls, but in reverse direction. */ + movq %rdi, %rax /* syscall num. */ + movq %rsi, %rdi /* arg #1. */ + movq %rdx, %rsi /* arg #2. */ + movq %rcx, %rdx /* arg #3. */ + movq %r8, %r10 /* arg #4. */ + movq %r9, %r8 /* arg #5. */ + + /* Arg #6 is on the stack. */ + movq 16(%rbp), %r9 /* arg #6. */ + + /* First 6 args are in registers, others - in stack. */ + /* Construct a new call stack frame. */ + /* XXX Only "mount" has more than 6 args - 8. */ + movq 32(%rbp), %rcx + pushq %rcx; cfi_adjust_cfa_offset(8) /* arg #7. */ + + movq 24(%rbp), %rcx + pushq %rcx; cfi_adjust_cfa_offset(8) /* arg #8. */ + +// movq 8(%rbp), %rcx +// pushq %rcx; + subq $8, %rsp; cfi_adjust_cfa_offset(8) /* return addr (intentionally ignored by syscall). */ + + syscall + + /* Restore the stack frame. */ + leave; cfi_adjust_cfa_offset(-32) /* Watch out, we have 4 cfi_adjust_cfa_offset above! */ + jb SYSCALL_ERROR_LABEL; /* Jump to error handler if error. */ L(pseudo_end): |