feat(stm32mp1): add plat_report_*_abort functions

The new helpers are created in STM32MP1 platform for prefetch and data
aborts.
While at it, put plat_report_exception() under DEBUG flag. If DEBUG is
not set, the weak function which does the same will be used.
This plat_report_exception() function can also be simplified, as it will
no more be used to report aborts.

Change-Id: Ibe989b28e236693f317cffb0545ea0611b7bdde4
Signed-off-by: Yann Gautier <yann.gautier@st.com>

plat/st/stm32mp1/stm32mp1_helper.S

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2022, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -15,6 +15,8 @@
 
 	.globl	platform_mem_init
 	.globl	plat_report_exception
+	.globl	plat_report_prefetch_abort
+	.globl	plat_report_data_abort
 	.globl	plat_get_my_entrypoint
 	.globl	plat_secondary_cold_boot_setup
 	.globl	plat_reset_handler
@@ -30,20 +32,18 @@ func platform_mem_init
 	bx	lr
 endfunc platform_mem_init
 
-func plat_report_exception
 #if DEBUG
+func plat_report_exception
 	mov	r8, lr
 
-	/* Test if an abort occurred */
+	/*
+	 * Test if an abort occurred
+	 * In this case the error message has already been displayed
+	 * by dedicated functions
+	 */
 	cmp	r0, #MODE32_abt
-	bne	undef_inst_lbl
+	beq	1f
-	ldr	r4, =abort_str
-	bl	asm_print_str
-	mrs	r4, lr_abt
-	sub	r4, r4, #4
-	b	print_exception_info
 
-undef_inst_lbl:
 	/* Test for an undefined instruction */
 	cmp	r0, #MODE32_und
 	bne	other_exception_lbl
@@ -69,12 +69,69 @@ print_exception_info:
 	ldr	r4, =end_error_str
 	bl	asm_print_str
 
+1:
 	bx	r8
-#else
-	bx	lr
-#endif
 endfunc plat_report_exception
 
+func plat_report_prefetch_abort
+	mov	r8, lr
+	mov	r9, r0
+
+	ldr	r4, =prefetch_abort_str
+	bl	asm_print_str
+
+	mov	r4, r9
+	sub	r4, r4, #4
+	bl	asm_print_hex
+
+	ldr	r4, =ifsr_str
+	bl	asm_print_str
+
+	ldcopr	r4, IFSR
+	bl	asm_print_hex
+
+	ldr	r4, =ifar_str
+	bl	asm_print_str
+
+	ldcopr	r4, IFAR
+	bl	asm_print_hex
+
+	ldr	r4, =end_error_str
+	bl	asm_print_str
+
+	bx	r8
+endfunc plat_report_prefetch_abort
+
+func plat_report_data_abort
+	mov	r8, lr
+	mov	r9, r0
+
+	ldr	r4, =data_abort_str
+	bl	asm_print_str
+
+	mov	r4, r9
+	sub	r4, r4, #8
+	bl	asm_print_hex
+
+	ldr	r4, =dfsr_str
+	bl	asm_print_str
+
+	ldcopr	r4, DFSR
+	bl	asm_print_hex
+
+	ldr	r4, =dfar_str
+	bl	asm_print_str
+
+	ldcopr	r4, DFAR
+	bl	asm_print_hex
+
+	ldr	r4, =end_error_str
+	bl	asm_print_str
+
+	bx	r8
+endfunc plat_report_data_abort
+#endif /* DEBUG */
+
 func plat_reset_handler
 	bx	lr
 endfunc plat_reset_handler
@@ -256,14 +313,24 @@ endfunc plat_panic_handler
 
 #if DEBUG
 .section .rodata.rev_err_str, "aS"
-abort_str:
+prefetch_abort_str:
-	.asciz "\nAbort at: 0x"
+	.asciz "\nPrefetch Abort at: 0x"
+data_abort_str:
+	.asciz "\nData Abort at: 0x"
 undefined_str:
 	.asciz "\nUndefined instruction at: 0x"
 exception_start_str:
 	.asciz "\nException mode=0x"
 exception_end_str:
 	.asciz " at: 0x"
+dfsr_str:
+	.asciz " DFSR = 0x"
+dfar_str:
+	.asciz " DFAR = 0x"
+ifsr_str:
+	.asciz " IFSR = 0x"
+ifar_str:
+	.asciz " IFAR = 0x"
 end_error_str:
 	.asciz "\n\r"
 #endif