2017.11 RC3
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Peter Robinson
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34cd2c20de
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6a431010ff
174
arm64-support-running-at-addr-other-than-linked-to.patch
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174
arm64-support-running-at-addr-other-than-linked-to.patch
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From patchwork Fri Nov 3 00:11:27 2017
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit
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Subject: [U-Boot] arm64: support running at addr other than linked to
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X-Patchwork-Submitter: Stephen Warren <swarren@wwwdotorg.org>
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X-Patchwork-Id: 833593
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X-Patchwork-Delegate: trini@ti.com
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Message-Id: <20171103001127.2055-1-swarren@wwwdotorg.org>
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To: Tom Rini <trini@konsulko.com>
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Cc: u-boot@lists.denx.de, Stephen Warren <swarren@nvidia.com>
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Date: Thu, 2 Nov 2017 18:11:27 -0600
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From: Stephen Warren <swarren@wwwdotorg.org>
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List-Id: U-Boot discussion <u-boot.lists.denx.de>
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From: Stephen Warren <swarren@nvidia.com>
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This is required in the case where U-Boot is typically loaded and run at
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a particular address, but for some reason the RAM at that location is not
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available, e.g. due to memory fragmentation loading other boot binaries or
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firmware, splitting an SMP complex between various different OSs without
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using e.g. the EL2 second-stage page tables to hide the memory asignments,
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or due to known ECC failures.
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Signed-off-by: Stephen Warren <swarren@nvidia.com>
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---
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arch/arm/Kconfig | 16 ++++++++++++++++
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arch/arm/cpu/armv8/start.S | 26 ++++++++++++++++++++++++++
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arch/arm/include/asm/config.h | 4 ----
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arch/arm/lib/crt0_64.S | 8 ++++++++
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arch/arm/lib/relocate_64.S | 23 ++++++++++++++++++-----
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5 files changed, 68 insertions(+), 9 deletions(-)
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diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
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index 83b7aa51dc2c..294b456414bc 100644
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--- a/arch/arm/Kconfig
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+++ b/arch/arm/Kconfig
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@@ -9,6 +9,22 @@ config ARM64
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select PHYS_64BIT
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select SYS_CACHE_SHIFT_6
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+if ARM64
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+config POSITION_INDEPENDENT
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+ bool "Generate position-independent pre-relocation code"
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+ help
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+ U-Boot expects to be linked to a specific hard-coded address, and to
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+ be loaded to and run from that address. This option lifts that
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+ restriction, thus allowing the code to be loaded to and executed
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+ from almost any address. This logic relies on the relocation
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+ information that is embedded into the binary to support U-Boot
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+ relocating itself to the top-of-RAM later during execution.
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+endif
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+
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+config STATIC_RELA
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+ bool
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+ default y if ARM64 && !POSITION_INDEPENDENT
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+
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config DMA_ADDR_T_64BIT
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bool
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default y if ARM64
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diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S
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index 5c500be51d1f..03e744e4a673 100644
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--- a/arch/arm/cpu/armv8/start.S
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+++ b/arch/arm/cpu/armv8/start.S
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@@ -57,6 +57,32 @@ reset:
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.globl save_boot_params_ret
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save_boot_params_ret:
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+#if CONFIG_POSITION_INDEPENDENT
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+ /*
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+ * Fix .rela.dyn relocations. This allows U-Boot to be loaded to and
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+ * executed at a different address than it was linked at.
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+ */
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+pie_fixup:
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+ adr x0, _start /* x0 <- Runtime value of _start */
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+ ldr x1, _TEXT_BASE /* x1 <- Linked value of _start */
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+ sub x9, x0, x1 /* x9 <- Run-vs-link offset */
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+ adr x2, __rel_dyn_start /* x2 <- Runtime &__rel_dyn_start */
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+ adr x3, __rel_dyn_end /* x3 <- Runtime &__rel_dyn_end */
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+pie_fix_loop:
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+ ldp x0, x1, [x2], #16 /* (x0, x1) <- (Link location, fixup) */
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+ ldr x4, [x2], #8 /* x4 <- addend */
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+ cmp w1, #1027 /* relative fixup? */
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+ bne pie_skip_reloc
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+ /* relative fix: store addend plus offset at dest location */
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+ add x0, x0, x9
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+ add x4, x4, x9
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+ str x4, [x0]
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+pie_skip_reloc:
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+ cmp x2, x3
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+ b.lo pie_fix_loop
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+pie_fixup_done:
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+#endif
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+
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#ifdef CONFIG_SYS_RESET_SCTRL
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bl reset_sctrl
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#endif
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diff --git a/arch/arm/include/asm/config.h b/arch/arm/include/asm/config.h
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index 5674d37c04df..9f178293818e 100644
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--- a/arch/arm/include/asm/config.h
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+++ b/arch/arm/include/asm/config.h
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@@ -10,10 +10,6 @@
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#define CONFIG_LMB
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#define CONFIG_SYS_BOOT_RAMDISK_HIGH
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-#ifdef CONFIG_ARM64
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-#define CONFIG_STATIC_RELA
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-#endif
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-
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#if defined(CONFIG_ARCH_LS1021A) || \
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defined(CONFIG_CPU_PXA27X) || \
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defined(CONFIG_CPU_MONAHANS) || \
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diff --git a/arch/arm/lib/crt0_64.S b/arch/arm/lib/crt0_64.S
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index 9c46c93ca4c5..da7c62cbe0aa 100644
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--- a/arch/arm/lib/crt0_64.S
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+++ b/arch/arm/lib/crt0_64.S
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@@ -98,6 +98,14 @@ ENTRY(_main)
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ldr x18, [x18, #GD_NEW_GD] /* x18 <- gd->new_gd */
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adr lr, relocation_return
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+#if CONFIG_POSITION_INDEPENDENT
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+ /* Add in link-vs-runtime offset */
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+ adr x0, _start /* x0 <- Runtime value of _start */
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+ ldr x9, _TEXT_BASE /* x9 <- Linked value of _start */
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+ sub x9, x9, x0 /* x9 <- Run-vs-link offset */
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+ add lr, lr, x9
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+#endif
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+ /* Add in link-vs-relocation offset */
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ldr x9, [x18, #GD_RELOC_OFF] /* x9 <- gd->reloc_off */
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add lr, lr, x9 /* new return address after relocation */
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ldr x0, [x18, #GD_RELOCADDR] /* x0 <- gd->relocaddr */
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diff --git a/arch/arm/lib/relocate_64.S b/arch/arm/lib/relocate_64.S
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index fdba004363af..04804524ed65 100644
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--- a/arch/arm/lib/relocate_64.S
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+++ b/arch/arm/lib/relocate_64.S
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@@ -27,11 +27,24 @@ ENTRY(relocate_code)
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/*
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* Copy u-boot from flash to RAM
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*/
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- ldr x1, =__image_copy_start /* x1 <- SRC &__image_copy_start */
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- subs x9, x0, x1 /* x9 <- relocation offset */
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+ adr x1, __image_copy_start /* x1 <- Run &__image_copy_start */
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+ subs x9, x0, x1 /* x8 <- Run to copy offset */
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b.eq relocate_done /* skip relocation */
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- ldr x2, =__image_copy_end /* x2 <- SRC &__image_copy_end */
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+ /*
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+ * Don't ldr x1, __image_copy_start here, since if the code is already
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+ * running at an address other than it was linked to, that instruction
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+ * will load the relocated value of __image_copy_start. To
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+ * correctly apply relocations, we need to know the linked value.
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+ *
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+ * Linked &__image_copy_start, which we know was at
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+ * CONFIG_SYS_TEXT_BASE, which is stored in _TEXT_BASE, as a non-
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+ * relocated value, since it isn't a symbol reference.
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+ */
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+ ldr x1, _TEXT_BASE /* x1 <- Linked &__image_copy_start */
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+ subs x9, x0, x1 /* x9 <- Link to copy offset */
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+ adr x1, __image_copy_start /* x1 <- Run &__image_copy_start */
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+ adr x2, __image_copy_end /* x2 <- Run &__image_copy_end */
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copy_loop:
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ldp x10, x11, [x1], #16 /* copy from source address [x1] */
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stp x10, x11, [x0], #16 /* copy to target address [x0] */
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@@ -42,8 +55,8 @@ copy_loop:
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/*
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* Fix .rela.dyn relocations
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*/
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- ldr x2, =__rel_dyn_start /* x2 <- SRC &__rel_dyn_start */
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- ldr x3, =__rel_dyn_end /* x3 <- SRC &__rel_dyn_end */
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+ adr x2, __rel_dyn_start /* x2 <- Run &__rel_dyn_start */
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+ adr x3, __rel_dyn_end /* x3 <- Run &__rel_dyn_end */
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fixloop:
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ldp x0, x1, [x2], #16 /* (x0,x1) <- (SRC location, fixup) */
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ldr x4, [x2], #8 /* x4 <- addend */
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@ -1,8 +1,8 @@
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%global candidate rc2
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%global candidate rc3
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Name: uboot-tools
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Version: 2017.11
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Release: 0.2%{?candidate:.%{candidate}}%{?dist}
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Release: 0.3%{?candidate:.%{candidate}}%{?dist}
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Summary: U-Boot utilities
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License: GPLv2+ BSD LGPL-2.1+ LGPL-2.0+
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URL: http://www.denx.de/wiki/U-Boot
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@ -21,6 +21,7 @@ Patch1: uefi-use-Fedora-specific-path-name.patch
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Patch2: uefi-distro-load-FDT-from-any-partition-on-boot-device.patch
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Patch3: usb-kbd-fixes.patch
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Patch4: fdt-fixes.patch
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Patch5: arm64-support-running-at-addr-other-than-linked-to.patch
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# Board fixes and enablement
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Patch10: dragonboard-fixes.patch
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@ -283,6 +284,9 @@ cp -p board/warp7/README builds/docs/README.warp7
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%endif
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%changelog
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* Sat Nov 4 2017 Peter Robinson <pbrobinson@fedoraproject.org> 2017.11-0.3.rc3
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- 2017.11 RC3
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* Tue Oct 17 2017 Peter Robinson <pbrobinson@fedoraproject.org> 2017.11-0.2.rc2
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- Update / rebase a couple of patches
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