rewrite __aeabi_read_tp in asm

__aeabi_read_tp used to call c code, but that was incorrect as the
arm runtime abi specifies special pcs for this function: it is only
allowed to clobber r0, ip, lr and cpsr.

maintainer's note: the old code explicitly saved and restored all
general-purpose registers which are call-clobbered in the normal
calling convention, so it's unlikely that any real-world compilers
produced code that could break. however theoretically they could have
chosen to use floating point registers, in which case the caller's
values of those registers would be clobbered.

1 files changed, 0 insertions, 8 deletions

diff --git a/src/thread/arm/__aeabi_read_tp_c.c b/src/thread/arm/__aeabi_read_tp_c.c
deleted file mode 100644
index 0c56d613..00000000
--- a/src/thread/arm/__aeabi_read_tp_c.c
+++ /dev/null
@@ -1,8 +0,0 @@
-#include "pthread_impl.h"
-#include <stdint.h>
-
-__attribute__((__visibility__("hidden")))
-void *__aeabi_read_tp_c(void)
-{
-	return TP_ADJ(__pthread_self());
-}