xtensa: allow merging vectors into .text section
Currently code for exception/IRQ vectors is stored in kernel image as
initialization data and is copied to its working addresses during
startup. It doesn't always make sense. In many cases vectors location
can be automatically decided at kernel link time and code can be placed
right there. This is especially useful for XIP kernel.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
diff --git a/arch/xtensa/include/asm/vectors.h b/arch/xtensa/include/asm/vectors.h
index 77d41cc..65d3da9 100644
--- a/arch/xtensa/include/asm/vectors.h
+++ b/arch/xtensa/include/asm/vectors.h
@@ -67,7 +67,11 @@
#endif /* CONFIG_MMU */
#define RESET_VECTOR1_VADDR (XCHAL_RESET_VECTOR1_VADDR)
+#ifdef CONFIG_VECTORS_OFFSET
#define VECBASE_VADDR (KERNELOFFSET - CONFIG_VECTORS_OFFSET)
+#else
+#define VECBASE_VADDR _vecbase
+#endif
#if defined(XCHAL_HAVE_VECBASE) && XCHAL_HAVE_VECBASE
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index 23f2e03..7fc7bb9 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -455,6 +455,7 @@
mem_reserve(__pa(&_stext), __pa(&_end));
+#ifdef CONFIG_VECTORS_OFFSET
mem_reserve(__pa(&_WindowVectors_text_start),
__pa(&_WindowVectors_text_end));
@@ -491,6 +492,8 @@
__pa(&_Level6InterruptVector_text_end));
#endif
+#endif /* CONFIG_VECTORS_OFFSET */
+
#ifdef CONFIG_SMP
mem_reserve(__pa(&_SecondaryResetVector_text_start),
__pa(&_SecondaryResetVector_text_end));
diff --git a/arch/xtensa/kernel/vmlinux.lds.S b/arch/xtensa/kernel/vmlinux.lds.S
index 31411fc..30d9fc2 100644
--- a/arch/xtensa/kernel/vmlinux.lds.S
+++ b/arch/xtensa/kernel/vmlinux.lds.S
@@ -59,6 +59,7 @@
* garbage.)
*/
+#ifdef CONFIG_VECTORS_OFFSET
#define SECTION_VECTOR(sym, section, addr, max_prevsec_size, prevsec) \
section addr : AT((MIN(LOADADDR(prevsec) + max_prevsec_size, \
LOADADDR(prevsec) + SIZEOF(prevsec)) + 3) & ~ 3) \
@@ -68,6 +69,11 @@
*(section) \
sym ## _end = ABSOLUTE(.); \
}
+#else
+#define SECTION_VECTOR(section, addr) \
+ . = addr; \
+ *(section)
+#endif
/*
* Mapping of input sections to output sections when linking.
@@ -85,6 +91,37 @@
{
/* The HEAD_TEXT section must be the first section! */
HEAD_TEXT
+
+#ifndef CONFIG_VECTORS_OFFSET
+ . = ALIGN(PAGE_SIZE);
+ _vecbase = .;
+
+ SECTION_VECTOR (.WindowVectors.text, WINDOW_VECTORS_VADDR)
+#if XCHAL_EXCM_LEVEL >= 2
+ SECTION_VECTOR (.Level2InterruptVector.text, INTLEVEL2_VECTOR_VADDR)
+#endif
+#if XCHAL_EXCM_LEVEL >= 3
+ SECTION_VECTOR (.Level3InterruptVector.text, INTLEVEL3_VECTOR_VADDR)
+#endif
+#if XCHAL_EXCM_LEVEL >= 4
+ SECTION_VECTOR (.Level4InterruptVector.text, INTLEVEL4_VECTOR_VADDR)
+#endif
+#if XCHAL_EXCM_LEVEL >= 5
+ SECTION_VECTOR (.Level5InterruptVector.text, INTLEVEL5_VECTOR_VADDR)
+#endif
+#if XCHAL_EXCM_LEVEL >= 6
+ SECTION_VECTOR (.Level6InterruptVector.text, INTLEVEL6_VECTOR_VADDR)
+#endif
+ SECTION_VECTOR (.DebugInterruptVector.literal, DEBUG_VECTOR_VADDR - 4)
+ SECTION_VECTOR (.DebugInterruptVector.text, DEBUG_VECTOR_VADDR)
+ SECTION_VECTOR (.KernelExceptionVector.literal, KERNEL_VECTOR_VADDR - 4)
+ SECTION_VECTOR (.KernelExceptionVector.text, KERNEL_VECTOR_VADDR)
+ SECTION_VECTOR (.UserExceptionVector.literal, USER_VECTOR_VADDR - 4)
+ SECTION_VECTOR (.UserExceptionVector.text, USER_VECTOR_VADDR)
+ SECTION_VECTOR (.DoubleExceptionVector.literal, DOUBLEEXC_VECTOR_VADDR - 48)
+ SECTION_VECTOR (.DoubleExceptionVector.text, DOUBLEEXC_VECTOR_VADDR)
+#endif
+
TEXT_TEXT
VMLINUX_SYMBOL(__sched_text_start) = .;
*(.sched.literal .sched.text)
@@ -132,6 +169,7 @@
. = ALIGN(16);
__boot_reloc_table_start = ABSOLUTE(.);
+#ifdef CONFIG_VECTORS_OFFSET
RELOCATE_ENTRY(_WindowVectors_text,
.WindowVectors.text);
#if XCHAL_EXCM_LEVEL >= 2
@@ -164,6 +202,7 @@
.DoubleExceptionVector.text);
RELOCATE_ENTRY(_DebugInterruptVector_text,
.DebugInterruptVector.text);
+#endif
#if defined(CONFIG_SMP)
RELOCATE_ENTRY(_SecondaryResetVector_text,
.SecondaryResetVector.text);
@@ -186,6 +225,7 @@
. = ALIGN(4);
.dummy : { LONG(0) }
+#ifdef CONFIG_VECTORS_OFFSET
/* The vectors are relocated to the real position at startup time */
SECTION_VECTOR (_WindowVectors_text,
@@ -277,6 +317,7 @@
. = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
+#endif
#if defined(CONFIG_SMP)
SECTION_VECTOR (_SecondaryResetVector_text,
