git: 20845a6994c5 - main - linux(4): Validate exec_setregs on arm64

The branch main has been updated by dchagin:

URL: https://cgit.FreeBSD.org/src/commit/?id=20845a6994c548977874d1f413044d43c8474f0a

commit 20845a6994c548977874d1f413044d43c8474f0a
Author:     Dmitry Chagin <dchagin@FreeBSD.org>
AuthorDate: 2023-09-05 18:19:08 +0000
Commit:     Dmitry Chagin <dchagin@FreeBSD.org>
CommitDate: 2023-09-05 18:19:08 +0000

    linux(4): Validate exec_setregs on arm64
    
    The lr register is cleared at the beginning of the _dl_start and _start,
    so there is no need to initialize it.
    Gnu libc _start takes an rtld_fini pointer in x0 which is set by ld.so
    for __libc_start_main, the kernel does not register any atexit pointers.
    
    While here fix whitespaces.
    
    MFC after:              1 week
---
 sys/arm64/linux/linux_sysvec.c | 21 ++-------------------
 1 file changed, 2 insertions(+), 19 deletions(-)

diff --git a/sys/arm64/linux/linux_sysvec.c b/sys/arm64/linux/linux_sysvec.c
index 885ac4657380..3072732de768 100644
--- a/sys/arm64/linux/linux_sysvec.c
+++ b/sys/arm64/linux/linux_sysvec.c
@@ -51,7 +51,6 @@
 
 #include <arm64/linux/linux.h>
 #include <arm64/linux/linux_proto.h>
-#include <compat/linux/linux_dtrace.h>
 #include <compat/linux/linux_elf.h>
 #include <compat/linux/linux_emul.h>
 #include <compat/linux/linux_fork.h>
@@ -107,12 +106,6 @@ static void	linux_exec_sysvec_init(void *param);
 static int	linux_on_exec_vmspace(struct proc *p,
 		    struct image_params *imgp);
 
-/* DTrace init */
-LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
-
-/* DTrace probes */
-LIN_SDT_PROBE_DEFINE0(sysvec, linux_exec_setregs, todo);
-
 LINUX_VDSO_SYM_CHAR(linux_platform);
 LINUX_VDSO_SYM_INTPTR(kern_timekeep_base);
 LINUX_VDSO_SYM_INTPTR(__user_rt_sigreturn);
@@ -178,19 +171,9 @@ linux_exec_setregs(struct thread *td, struct image_params *imgp,
 	struct trapframe *regs = td->td_frame;
 	struct pcb *pcb = td->td_pcb;
 
-	/* LINUXTODO: validate */
-	LIN_SDT_PROBE0(sysvec, linux_exec_setregs, todo);
-
 	memset(regs, 0, sizeof(*regs));
-	/* glibc start.S registers function pointer in x0 with atexit. */
-        regs->tf_sp = stack;
-#if 0	/* LINUXTODO: See if this is used. */
-	regs->tf_lr = imgp->entry_addr;
-#else
-        regs->tf_lr = 0xffffffffffffffff;
-#endif
-        regs->tf_elr = imgp->entry_addr;
-
+	regs->tf_sp = stack;
+	regs->tf_elr = imgp->entry_addr;
 	pcb->pcb_tpidr_el0 = 0;
 	pcb->pcb_tpidrro_el0 = 0;
 	WRITE_SPECIALREG(tpidrro_el0, 0);