Merge "PIE: make call to GDT relocation fixup generalized" into integration

bl1/aarch64/bl1_entrypoint.S

@@ -30,7 +30,8 @@ func bl1_entrypoint
 		_secondary_cold_boot=!COLD_BOOT_SINGLE_CPU	\
 		_init_memory=1					\
 		_init_c_runtime=1				\
-		_exception_vectors=bl1_exceptions
+		_exception_vectors=bl1_exceptions		\
+		_pie_fixup_size=0
 
 	/* --------------------------------------------------------------------
 	 * Perform BL1 setup

bl2/aarch64/bl2_el3_entrypoint.S

@@ -26,7 +26,8 @@ func bl2_entrypoint
 		_secondary_cold_boot=!COLD_BOOT_SINGLE_CPU      \
 		_init_memory=1                                  \
 		_init_c_runtime=1                               \
-		_exception_vectors=bl2_el3_exceptions
+		_exception_vectors=bl2_el3_exceptions		\
+		_pie_fixup_size=0
 
 	/* ---------------------------------------------
 	 * Restore parameters of boot rom

bl31/aarch64/bl31_entrypoint.S

@@ -32,17 +32,6 @@ func bl31_entrypoint
 	mov	x22, x2
 	mov	x23, x3
 
-	/* --------------------------------------------------------------------
-	 * If PIE is enabled, fixup the Global descriptor Table and dynamic
-	 * relocations
-	 * --------------------------------------------------------------------
-	 */
-#if ENABLE_PIE
-	mov_imm	x0, BL31_BASE
-	mov_imm	x1, BL31_LIMIT
-	bl	fixup_gdt_reloc
-#endif /* ENABLE_PIE */
-
 #if !RESET_TO_BL31
 	/* ---------------------------------------------------------------------
 	 * For !RESET_TO_BL31 systems, only the primary CPU ever reaches
@@ -59,7 +48,8 @@ func bl31_entrypoint
 		_secondary_cold_boot=0				\
 		_init_memory=0					\
 		_init_c_runtime=1				\
-		_exception_vectors=runtime_exceptions
+		_exception_vectors=runtime_exceptions		\
+		_pie_fixup_size=BL31_LIMIT - BL31_BASE
 #else
 
 	/* ---------------------------------------------------------------------
@@ -74,7 +64,8 @@ func bl31_entrypoint
 		_secondary_cold_boot=!COLD_BOOT_SINGLE_CPU	\
 		_init_memory=1					\
 		_init_c_runtime=1				\
-		_exception_vectors=runtime_exceptions
+		_exception_vectors=runtime_exceptions		\
+		_pie_fixup_size=BL31_LIMIT - BL31_BASE
 
 	/* ---------------------------------------------------------------------
 	 * For RESET_TO_BL31 systems, BL31 is the first bootloader to run so
@@ -174,7 +165,8 @@ func bl31_warm_entrypoint
 		_secondary_cold_boot=0				\
 		_init_memory=0					\
 		_init_c_runtime=0				\
-		_exception_vectors=runtime_exceptions
+		_exception_vectors=runtime_exceptions		\
+		_pie_fixup_size=0
 
 	/*
 	 * We're about to enable MMU and participate in PSCI state coordination.

include/arch/aarch64/el3_common_macros.S

@@ -232,11 +232,18 @@
  *
  * _exception_vectors:
  *	Address of the exception vectors to program in the VBAR_EL3 register.
+ *
+ * _pie_fixup_size:
+ *	Size of memory region to fixup Global Descriptor Table (GDT).
+ *
+ *	A non-zero value is expected when firmware needs GDT to be fixed-up.
+ *
  * -----------------------------------------------------------------------------
  */
 	.macro el3_entrypoint_common					\
 		_init_sctlr, _warm_boot_mailbox, _secondary_cold_boot,	\
-		_init_memory, _init_c_runtime, _exception_vectors
+		_init_memory, _init_c_runtime, _exception_vectors,	\
+		_pie_fixup_size
 
 	.if \_init_sctlr
 		/* -------------------------------------------------------------
@@ -283,6 +290,26 @@
 	do_cold_boot:
 	.endif /* _warm_boot_mailbox */
 
+	.if \_pie_fixup_size
+#if ENABLE_PIE
+		/*
+		 * ------------------------------------------------------------
+		 * If PIE is enabled fixup the Global descriptor Table only
+		 * once during primary core cold boot path.
+		 *
+		 * Compile time base address, required for fixup, is calculated
+		 * using "pie_fixup" label present within first page.
+		 * ------------------------------------------------------------
+		 */
+	pie_fixup:
+		ldr	x0, =pie_fixup
+		and	x0, x0, #~(PAGE_SIZE - 1)
+		mov_imm	x1, \_pie_fixup_size
+		add	x1, x1, x0
+		bl	fixup_gdt_reloc
+#endif /* ENABLE_PIE */
+	.endif /* _pie_fixup_size */
+
 	/* ---------------------------------------------------------------------
 	 * Set the exception vectors.
 	 * ---------------------------------------------------------------------