+/* SPDX-License-Identifier: GPL-2.0+ */
/*
* relocate - common relocation function for ARM U-Boot
*
* Copyright (c) 2013 Albert ARIBAUD <albert.u.boot@aribaud.net>
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <asm-offsets.h>
+#include <asm/assembler.h>
#include <config.h>
+#include <elf.h>
#include <linux/linkage.h>
+#ifdef CONFIG_CPU_V7M
+#include <asm/armv7m.h>
+#endif
/*
- * void relocate_code(addr_moni)
- *
- * This function relocates the monitor code.
+ * Default/weak exception vectors relocation routine
*
- * NOTE:
- * To prevent the code below from containing references with an R_ARM_ABS32
- * relocation record type, we never refer to linker-defined symbols directly.
- * Instead, we declare literals which contain their relative location with
- * respect to relocate_code, and at run time, add relocate_code back to them.
+ * This routine covers the standard ARM cases: normal (0x00000000),
+ * high (0xffff0000) and VBAR. SoCs which do not comply with any of
+ * the standard cases must provide their own, strong, version.
*/
-ENTRY(relocate_code)
- ldr r1, =__image_copy_start /* r1 <- SRC &__image_copy_start */
- subs r4, r0, r1 /* r4 <- relocation offset */
- beq relocate_done /* skip relocation */
- ldr r2, =__image_copy_end /* r2 <- SRC &__image_copy_end */
+ .section .text.relocate_vectors,"ax",%progbits
+ .weak relocate_vectors
-copy_loop:
- ldmia r1!, {r10-r11} /* copy from source address [r1] */
- stmia r0!, {r10-r11} /* copy to target address [r0] */
- cmp r1, r2 /* until source end address [r2] */
- blo copy_loop
+ENTRY(relocate_vectors)
+#ifdef CONFIG_CPU_V7M
/*
- * fix .rel.dyn relocations
- */
- ldr r2, =__rel_dyn_start /* r2 <- SRC &__rel_dyn_start */
- ldr r3, =__rel_dyn_end /* r3 <- SRC &__rel_dyn_end */
-fixloop:
- ldmia r2!, {r0-r1} /* (r0,r1) <- (SRC location,fixup) */
- and r1, r1, #0xff
- cmp r1, #23 /* relative fixup? */
- bne fixnext
-
- /* relative fix: increase location by offset */
- add r0, r0, r4
- ldr r1, [r0]
- add r1, r1, r4
- str r1, [r0]
-fixnext:
- cmp r2, r3
- blo fixloop
-
- /*
- * Relocate the exception vectors
+ * On ARMv7-M we only have to write the new vector address
+ * to VTOR register.
*/
+ ldr r0, [r9, #GD_RELOCADDR] /* r0 = gd->relocaddr */
+ ldr r1, =V7M_SCB_BASE
+ str r0, [r1, V7M_SCB_VTOR]
+#else
#ifdef CONFIG_HAS_VBAR
/*
* If the ARM processor has the security extensions,
ldmia r0!, {r2-r8,r10}
stmia r1!, {r2-r8,r10}
#endif
+#endif
+ bx lr
+
+ENDPROC(relocate_vectors)
+
+/*
+ * void relocate_code(addr_moni)
+ *
+ * This function relocates the monitor code.
+ *
+ * NOTE:
+ * To prevent the code below from containing references with an R_ARM_ABS32
+ * relocation record type, we never refer to linker-defined symbols directly.
+ * Instead, we declare literals which contain their relative location with
+ * respect to relocate_code, and at run time, add relocate_code back to them.
+ */
+
+ENTRY(relocate_code)
+ adr r3, relocate_code
+ ldr r1, _image_copy_start_ofs
+ add r1, r3 /* r1 <- Run &__image_copy_start */
+ subs r4, r0, r1 /* r4 <- Run to copy offset */
+ beq relocate_done /* skip relocation */
+ ldr r1, _image_copy_start_ofs
+ add r1, r3 /* r1 <- Run &__image_copy_start */
+ ldr r2, _image_copy_end_ofs
+ add r2, r3 /* r2 <- Run &__image_copy_end */
+copy_loop:
+ ldmia r1!, {r10-r11} /* copy from source address [r1] */
+ stmia r0!, {r10-r11} /* copy to target address [r0] */
+ cmp r1, r2 /* until source end address [r2] */
+ blo copy_loop
+
+ /*
+ * fix .rel.dyn relocations
+ */
+ ldr r1, _rel_dyn_start_ofs
+ add r2, r1, r3 /* r2 <- Run &__rel_dyn_start */
+ ldr r1, _rel_dyn_end_ofs
+ add r3, r1, r3 /* r3 <- Run &__rel_dyn_end */
+fixloop:
+ ldmia r2!, {r0-r1} /* (r0,r1) <- (SRC location,fixup) */
+ and r1, r1, #0xff
+ cmp r1, #R_ARM_RELATIVE
+ bne fixnext
+
+ /* relative fix: increase location by offset */
+ add r0, r0, r4
+ ldr r1, [r0]
+ add r1, r1, r4
+ str r1, [r0]
+fixnext:
+ cmp r2, r3
+ blo fixloop
relocate_done:
#endif
ENDPROC(relocate_code)
+
+_image_copy_start_ofs:
+ .word __image_copy_start - relocate_code
+_image_copy_end_ofs:
+ .word __image_copy_end - relocate_code
+_rel_dyn_start_ofs:
+ .word __rel_dyn_start - relocate_code
+_rel_dyn_end_ofs:
+ .word __rel_dyn_end - relocate_code
projects / platform / kernel / u-boot.git / blobdiff