diff options
Diffstat (limited to 'lib/libc/amd64/gen/makecontext.c')
| -rw-r--r-- | lib/libc/amd64/gen/makecontext.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/libc/amd64/gen/makecontext.c b/lib/libc/amd64/gen/makecontext.c index 87cf7bf..74eb68a 100644 --- a/lib/libc/amd64/gen/makecontext.c +++ b/lib/libc/amd64/gen/makecontext.c @@ -70,8 +70,12 @@ __makecontext(ucontext_t *ucp, void (*start)(void), int argc, ...) /* Allocate space for a maximum of 6 arguments on the stack. */ args = sp - 6; - /* Account for arguments on stack and align to 16 bytes. */ - sp -= 8; + /* + * Account for arguments on stack and do the funky C entry alignment. + * This means that we need an 8-byte-odd alignment since the ABI expects + * the return address to be pushed, thus breaking the 16 byte alignment. + */ + sp -= 7; /* Add the arguments: */ va_start(ap, argc); |
