--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) Copyright 2022 Advanced Micro Devices, Inc
+ * Michal Simek <michal.simek@amd.com>
+ */
+
+#include <common.h>
+#include <elf.h>
+
+#define R_MICROBLAZE_NONE 0
+#define R_MICROBLAZE_32 1
+#define R_MICROBLAZE_REL 16
+#define R_MICROBLAZE_GLOB_DAT 18
+
+/**
+ * mb_fix_rela - update relocation to new address
+ * @reloc_addr: new relocation address
+ * @verbose: enable version messages
+ * @rela_start: rela section start
+ * @rela_end: rela section end
+ * @dyn_start: dynamic section start
+ * @origin_addr: address where u-boot starts(doesn't need to be CONFIG_SYS_TEXT_BASE)
+ */
+void mb_fix_rela(u32 reloc_addr, u32 verbose, u32 rela_start,
+ u32 rela_end, u32 dyn_start, u32 origin_addr)
+{
+ u32 num, type, mask, i, reloc_off;
+
+ /*
+ * Return in case u-boot.elf is used directly.
+ * Skip it when u-boot.bin is loaded to different address than
+ * CONFIG_SYS_TEXT_BASE. In this case relocation is necessary to run.
+ */
+ if (reloc_addr == CONFIG_SYS_TEXT_BASE) {
+ debug_cond(verbose,
+ "Relocation address is the same - skip relocation\n");
+ return;
+ }
+
+ reloc_off = reloc_addr - origin_addr;
+
+ debug_cond(verbose, "Relocation address:\t0x%08x\n", reloc_addr);
+ debug_cond(verbose, "Relocation offset:\t0x%08x\n", reloc_off);
+ debug_cond(verbose, "Origin address:\t0x%08x\n", origin_addr);
+ debug_cond(verbose, "Rela start:\t0x%08x\n", rela_start);
+ debug_cond(verbose, "Rela end:\t0x%08x\n", rela_end);
+ debug_cond(verbose, "Dynsym start:\t0x%08x\n", dyn_start);
+
+ num = (rela_end - rela_start) / sizeof(Elf32_Rela);
+
+ debug_cond(verbose, "Number of entries:\t%u\n", num);
+
+ for (i = 0; i < num; i++) {
+ Elf32_Rela *rela;
+ u32 temp;
+
+ rela = (Elf32_Rela *)(rela_start + sizeof(Elf32_Rela) * i);
+
+ mask = 0xffULL; /* would be different on 32-bit */
+ type = rela->r_info & mask;
+
+ debug_cond(verbose, "\nRela possition:\t%d/0x%x\n",
+ i, (u32)rela);
+
+ switch (type) {
+ case R_MICROBLAZE_REL:
+ temp = *(u32 *)rela->r_offset;
+
+ debug_cond(verbose, "Type:\tREL\n");
+ debug_cond(verbose, "Rela r_offset:\t\t0x%x\n", rela->r_offset);
+ debug_cond(verbose, "Rela r_info:\t\t0x%x\n", rela->r_info);
+ debug_cond(verbose, "Rela r_addend:\t\t0x%x\n", rela->r_addend);
+ debug_cond(verbose, "Value at r_offset:\t0x%x\n", temp);
+
+ rela->r_offset += reloc_off;
+ rela->r_addend += reloc_off;
+
+ temp = *(u32 *)rela->r_offset;
+ temp += reloc_off;
+ *(u32 *)rela->r_offset = temp;
+
+ debug_cond(verbose, "New:Rela r_offset:\t0x%x\n", rela->r_offset);
+ debug_cond(verbose, "New:Rela r_addend:\t0x%x\n", rela->r_addend);
+ debug_cond(verbose, "New:Value at r_offset:\t0x%x\n", temp);
+ break;
+ case R_MICROBLAZE_32:
+ case R_MICROBLAZE_GLOB_DAT:
+ debug_cond(verbose, "Type:\t(32/GLOB) %u\n", type);
+ debug_cond(verbose, "Rela r_offset:\t\t0x%x\n", rela->r_offset);
+ debug_cond(verbose, "Rela r_info:\t\t0x%x\n", rela->r_info);
+ debug_cond(verbose, "Rela r_addend:\t\t0x%x\n", rela->r_addend);
+ debug_cond(verbose, "Value at r_offset:\t0x%x\n", temp);
+
+ rela->r_offset += reloc_off;
+
+ temp = *(u32 *)rela->r_offset;
+ temp += reloc_off;
+ *(u32 *)rela->r_offset = temp;
+
+ debug_cond(verbose, "New:Rela r_offset:\t0x%x\n", rela->r_offset);
+ debug_cond(verbose, "New:Value at r_offset:\t0x%x\n", temp);
+ break;
+ case R_MICROBLAZE_NONE:
+ debug_cond(verbose, "R_MICROBLAZE_NONE - skip\n");
+ break;
+ default:
+ debug_cond(verbose, "warning: unsupported relocation type %d at %x\n",
+ type, rela->r_offset);
+ }
+ }
+}
#include <asm-offsets.h>
#include <config.h>
+#if defined(CONFIG_STATIC_RELA)
+#define SYM_ADDR(reg, reg_add, symbol) \
+ mfs r20, rpc; \
+ addik r20, r20, _GLOBAL_OFFSET_TABLE_ + 8; \
+ lwi reg, r20, symbol@GOT; \
+ addk reg, reg reg_add;
+#else
#define SYM_ADDR(reg, reg_add, symbol) \
addi reg, reg_add, symbol
+#endif
.text
.global _start
addi r1, r0, CONFIG_SPL_STACK_ADDR
#else
add r1, r0, r20
+#if defined(CONFIG_STATIC_RELA)
+ bri 1f
+
+ /* Force alignment for easier ASM code below */
+#define ALIGNMENT_ADDR 0x20
+ .align 4
+uboot_dyn_start:
+ .word __rel_dyn_start
+
+uboot_dyn_end:
+ .word __rel_dyn_end
+
+uboot_sym_start:
+ .word __dyn_sym_start
+1:
+
+ addi r5, r20, 0
+ add r6, r0, r0
+
+ lwi r7, r20, ALIGNMENT_ADDR
+ addi r7, r7, -CONFIG_SYS_TEXT_BASE
+ add r7, r7, r5
+ lwi r8, r20, ALIGNMENT_ADDR + 0x4
+ addi r8, r8, -CONFIG_SYS_TEXT_BASE
+ add r8, r8, r5
+ lwi r9, r20, ALIGNMENT_ADDR + 0x8
+ addi r9, r9, -CONFIG_SYS_TEXT_BASE
+ add r9, r9, r5
+ addi r10, r0, CONFIG_SYS_TEXT_BASE
+
+ brlid r15, mb_fix_rela
+ nop
+#endif
#endif
addi r1, r1, -4 /* Decrement SP to top of memory */
brlid r15, __setup_exceptions
nop
+#if defined(CONFIG_STATIC_RELA)
+ /* reloc_offset is current location */
+ SYM_ADDR(r10, r0, _start)
+
+ /* r5 new address where I should copy code */
+ add r5, r0, r7 /* Move reloc addr to r5 */
+
+ /* Verbose message */
+ addi r6, r0, 0
+
+ SYM_ADDR(r7, r0, __rel_dyn_start)
+ rsub r7, r10, r7
+ add r7, r7, r5
+ SYM_ADDR(r8, r0, __rel_dyn_end)
+ rsub r8, r10, r8
+ add r8, r8, r5
+ SYM_ADDR(r9, r0, __dyn_sym_start)
+ rsub r9, r10, r9
+ add r9, r9, r5
+ brlid r15, mb_fix_rela
+ nop
+
+ /* end of code which does relocation */
+#else
/* Check if GOT exist */
addik r21, r23, _got_start
addik r22, r23, _got_end
cmpu r12, r21, r22 /* Check if this cross boundary */
bneid r12, 3b
addik r21. r21, 4
+#endif
/* Flush caches to ensure consistency */
addik r5, r0, 0
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