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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Daniel Axtens <dja@axtens.net>
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Date: Fri, 22 Oct 2021 09:53:15 +1100
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Subject: [PATCH] powerpc-ieee1275: load grub at 4MB, not 2MB
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This was first reported under PFW but reproduces under SLOF.
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- The core.elf was 2126152 = 0x207148 bytes in size with the following
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program headers (per readelf):
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Entry point 0x200000
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There are 4 program headers, starting at offset 52
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Program Headers:
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Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
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LOAD 0x000160 0x00200000 0x00200000 0x21f98 0x2971c RWE 0x8
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GNU_STACK 0x0220f8 0x00000000 0x00000000 0x00000 0x00000 RWE 0x4
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LOAD 0x0220f8 0x00232000 0x00232000 0x1e4e50 0x1e4e50 RWE 0x4
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NOTE 0x206f48 0x00000000 0x00000000 0x00200 0x00000 R 0x4
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- SLOF places the ELF file at 0x4000 (after the reserved space for
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interrupt handlers etc.) upwards. The image was 2126152 = 0x207148
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bytes in size, so it runs from 0x4000 - 0x20b148. We'll call 0x4000 the
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load address.
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0x0 0x4000 0x20b148
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|----------|--------------|
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| reserved | ELF contents |
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- SLOF then copies the first LOAD program header (for .text). That runs
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for 0x21f98 bytes. It runs from
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(load addr + 0x160) to (load addr + 0x160 + 0x21f98)
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= 0x4160 to 0x260f8
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and we copy it to 0x200000 to 0x221f98. This overwrites the end of the
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image:
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0x0 0x4000 0x200000 0x221f98
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|----------|------------|---------------|
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| reserved | ELF cont.. | .text section |
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- SLOF zeros the bss up to PhysAddr + MemSize = 0x22971c
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0x0 0x4000 0x200000 0x221f98 0x22971c
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|----------|------------|---------------|--------|
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| reserved | ELF cont.. | .text section | bss 0s |
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- SLOF then goes to fulfil the next LOAD header (for mods), which is
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for 0x1e4e50 bytes. We copy from
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(load addr + 0x220f8) to (load addr + 0x220f8 + 0x1e4e50)
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= 0x260f8 to 0x20af48
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and we copy it to 0x232000 to 0x416e50:
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0x0 0x4000 0x200000 0x221f98 0x22971c
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|----------|------------|---------------|--------|
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| reserved | ELF cont.. | .text section | bss 0s |
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|-------------|
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| copied area |
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0x260f8 0x20af48
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This goes poorly:
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0x0 0x4000 0x200000 0x221f98 0x22971c 0x232000 0x40bf08 0x416e50
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|----------|------------|---------------|--------|-----|-----------|-------------|
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| reserved | ELF cont.. | .text section | bss 0s | pad | some mods | .text start |
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This matches the observations on the running system - 0x40bf08 was where
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the contents of memory no longer matched the contents of the ELF file.
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This was reported as a license verification failure on SLOF as the
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last module's .module_license section fell past where the corruption
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began.
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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[rharwood@redhat.com: trim very detailed commit message]
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Signed-off-by: Robbie Harwood <rharwood@redhat.com>
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---
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grub-core/Makefile.core.def | 2 +-
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include/grub/offsets.h | 2 +-
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2 files changed, 2 insertions(+), 2 deletions(-)
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diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
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index 4a57de975e..08ac0fb15f 100644
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--- a/grub-core/Makefile.core.def
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+++ b/grub-core/Makefile.core.def
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@@ -89,7 +89,7 @@ kernel = {
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i386_xen_pvh_ldflags = '$(TARGET_IMG_BASE_LDOPT),0x100000';
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mips_loongson_ldflags = '-Wl,-Ttext,0x80200000';
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- powerpc_ieee1275_ldflags = '-Wl,-Ttext,0x200000';
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+ powerpc_ieee1275_ldflags = '-Wl,-Ttext,0x400000';
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sparc64_ieee1275_ldflags = '-Wl,-Ttext,0x4400';
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mips_arc_ldflags = '-Wl,-Ttext,$(TARGET_LINK_ADDR)';
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mips_qemu_mips_ldflags = '-Wl,-Ttext,0x80200000';
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diff --git a/include/grub/offsets.h b/include/grub/offsets.h
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index 871e1cd4c3..69211aa798 100644
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--- a/include/grub/offsets.h
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+++ b/include/grub/offsets.h
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@@ -63,7 +63,7 @@
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#define GRUB_KERNEL_SPARC64_IEEE1275_LINK_ADDR 0x4400
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#define GRUB_KERNEL_POWERPC_IEEE1275_LINK_ALIGN 4
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-#define GRUB_KERNEL_POWERPC_IEEE1275_LINK_ADDR 0x200000
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+#define GRUB_KERNEL_POWERPC_IEEE1275_LINK_ADDR 0x400000
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#define GRUB_KERNEL_MIPS_LOONGSON_LINK_ADDR 0x80200000
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