arm: Put assembly functions into separate sections

This patch changes the ENTRY() macro in asm.h to create a new section
for every assembler function, thus providing dcache_clean/invalidate_all
and friends with the same --gc-sections goodness that our C functions
have. This requires a few minor changes of moving around data (to make
sure it ends up in the right section) and changing some libgcc functions
(which apparently need to have two names?), but nothing serious.

(You may note that some of our assembly functions have data, sometimes
even writable, within the same .text section. This has been this way
before and I'm not looking to change it for now, although it's not
totally clean. Since we don't enforce read-only sections through paging,
it doesn't really hurt.)

BUG=None
TEST=Nyan and Snow still boot. Confirm dcache_invalidate_all is not
output into any binary anymore since no one actually uses it.

Original-Change-Id: I247b29d6173ba516c8dff59126c93b66f7dc4b8d
Original-Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/183891
(cherry picked from commit 4a3f2e45e06cc8592d56c3577f41ff879f10e9cc)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: Ieaa4f2ea9d81c5b9e2b36a772ff9610bdf6446f9
Reviewed-on: http://review.coreboot.org/7451
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>

4 files changed, 20 insertions, 10 deletions

diff --git a/src/arch/arm/libgcc/ashldi3.S b/src/arch/arm/libgcc/ashldi3.S
index bf7e7e75c4..3009f18b83 100644
--- a/src/arch/arm/libgcc/ashldi3.S
+++ b/src/arch/arm/libgcc/ashldi3.S
@@ -39,7 +39,8 @@ Boston, MA 02110-1301, USA.  */
 #endif
 
 ENTRY(__ashldi3)
-ENTRY(__aeabi_llsl)
+.global __aeabi_llsl
+__aeabi_llsl:
 
 	subs	r3, r2, #32
 	rsb	ip, r2, #32
@@ -51,7 +52,8 @@ ENTRY(__aeabi_llsl)
 	mov	al, al, lsl r2
 	mov	pc, lr
 
+.type __aeabi_llsl, %function
+.size __aeabi_llsl, .-__aeabi_llsl
 ENDPROC(__ashldi3)
-ENDPROC(__aeabi_llsl)
 
 #endif
diff --git a/src/arch/arm/libgcc/lib1funcs.S b/src/arch/arm/libgcc/lib1funcs.S
index 533c369d6e..f78a937afc 100644
--- a/src/arch/arm/libgcc/lib1funcs.S
+++ b/src/arch/arm/libgcc/lib1funcs.S
@@ -206,7 +206,8 @@ Boston, MA 02111-1307, USA.  */
 
 
 ENTRY(__udivsi3)
-ENTRY(__aeabi_uidiv)
+.global __aeabi_uidiv
+__aeabi_uidiv:
 
 	subs	r2, r1, #1
 	moveq	pc, lr
@@ -230,8 +231,9 @@ ENTRY(__aeabi_uidiv)
 	mov	r0, r0, lsr r2
 	mov	pc, lr
 
+.type __aeabi_uidiv, %function
+.size __aeabi_uidiv, .-__aeabi_uidiv
 ENDPROC(__udivsi3)
-ENDPROC(__aeabi_uidiv)
 
 ENTRY(__umodsi3)
 
@@ -250,7 +252,8 @@ ENTRY(__umodsi3)
 ENDPROC(__umodsi3)
 
 ENTRY(__divsi3)
-ENTRY(__aeabi_idiv)
+.global __aeabi_idiv
+__aeabi_idiv:
 
 	cmp	r1, #0
 	eor	ip, r0, r1			@ save the sign of the result.
@@ -287,8 +290,9 @@ ENTRY(__aeabi_idiv)
 	rsbmi	r0, r0, #0
 	mov	pc, lr
 
+.type __aeabi_idiv, %function
+.size __aeabi_idiv, .-__aeabi_idiv
 ENDPROC(__divsi3)
-ENDPROC(__aeabi_idiv)
 
 ENTRY(__modsi3)
 
diff --git a/src/arch/arm/libgcc/lshrdi3.S b/src/arch/arm/libgcc/lshrdi3.S
index 5a5809a17e..7af0c83123 100644
--- a/src/arch/arm/libgcc/lshrdi3.S
+++ b/src/arch/arm/libgcc/lshrdi3.S
@@ -39,7 +39,8 @@ Boston, MA 02110-1301, USA.  */
 #endif
 
 ENTRY(__lshrdi3)
-ENTRY(__aeabi_llsr)
+.global __aeabi_llsr
+__aeabi_llsr:
 
 	subs	r3, r2, #32
 	rsb	ip, r2, #32
@@ -51,7 +52,8 @@ ENTRY(__aeabi_llsr)
 	mov	ah, ah, lsr r2
 	mov	pc, lr
 
+.type __aeabi_llsr, %function
+.size __aeabi_llsr, .-__aeabi_llsr
 ENDPROC(__lshrdi3)
-ENDPROC(__aeabi_llsr)
 
 #endif
diff --git a/src/arch/arm/libgcc/muldi3.S b/src/arch/arm/libgcc/muldi3.S
index f6a40a8dc2..652dacab26 100644
--- a/src/arch/arm/libgcc/muldi3.S
+++ b/src/arch/arm/libgcc/muldi3.S
@@ -27,7 +27,8 @@
 #endif
 
 ENTRY(__muldi3)
-ENTRY(__aeabi_lmul)
+.global __aeabi_lmul
+__aeabi_lmul:
 
 	mul	xh, yl, xh
 	mla	xh, xl, yh, xh
@@ -45,7 +46,8 @@ ENTRY(__aeabi_lmul)
 	adc	xh, xh, ip, lsr #16
 	mov	pc, lr
 
+.type __aeabi_lmul, %function
+.size __aeabi_lmul, .-__aeabi_lmul
 ENDPROC(__muldi3)
-ENDPROC(__aeabi_lmul)
 
 #endif