From a46c1b96f3949c2c15e130249094818981b06835 Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Tue, 25 Oct 2022 13:10:54 +0100 Subject: [PATCH] TODO: fix variadic syscalls Only use as many varargs as accessible according to the bounds of c9. TODO: squash into original syscall support --- sysdeps/unix/sysv/linux/aarch64/clone.S | 5 +++++ sysdeps/unix/sysv/linux/aarch64/syscall.S | 13 +++++++++++++ 2 files changed, 18 insertions(+) diff --git a/sysdeps/unix/sysv/linux/aarch64/clone.S b/sysdeps/unix/sysv/linux/aarch64/clone.S index 663853ab4a5..4d7852304bd 100644 --- a/sysdeps/unix/sysv/linux/aarch64/clone.S +++ b/sysdeps/unix/sysv/linux/aarch64/clone.S @@ -66,8 +66,13 @@ ENTRY(__clone) PTR_ARG (6) #else cbz x9, L(skip_args) + gclen x10, c9 ldr c4, [c9] + cmp x10, 16 + bls L(skip_args) ldr c5, [c9,16] + cmp x10, 32 + bls L(skip_args) ldr c6, [c9,32] L(skip_args): #endif diff --git a/sysdeps/unix/sysv/linux/aarch64/syscall.S b/sysdeps/unix/sysv/linux/aarch64/syscall.S index ec4688433dd..43a81fc2482 100644 --- a/sysdeps/unix/sysv/linux/aarch64/syscall.S +++ b/sysdeps/unix/sysv/linux/aarch64/syscall.S @@ -30,12 +30,25 @@ ENTRY (syscall) uxtw x8, w0 #ifdef __CHERI_PURE_CAPABILITY__ cbz x9, L(skip_args) + gclen x10, c9 ldr c0, [c9] + cmp x10, 16 + bls L(skip_args) ldr c1, [c9,16] + cmp x10, 32 + bls L(skip_args) ldr c2, [c9,32] + cmp x10, 48 + bls L(skip_args) ldr c3, [c9,48] + cmp x10, 64 + bls L(skip_args) ldr c4, [c9,64] + cmp x10, 80 + bls L(skip_args) ldr c5, [c9,80] + cmp x10, 96 + bls L(skip_args) ldr c6, [c9,96] L(skip_args): #else -- 2.47.2