boot: Bring back bootloader builds

This adds back sd-boot builds by using meson compile targets directly.
We can do this now, because userspace binaries use the special
dependency that allows us to easily separate flags, so that we don't
pass anything to EFI builds that shouldn't be passed.

Additionally, we pass a bunch of flags to hopefully disable/override any
distro provided flags that should not be used for EFI binaries.

Fixes: #12275

1 files changed, 49 insertions, 0 deletions

diff --git a/tools/elf2efi.lds b/tools/elf2efi.lds
new file mode 100644
index 0000000000..eed9e279e9
--- /dev/null
+++ b/tools/elf2efi.lds
@@ -0,0 +1,49 @@
+SECTIONS {
+        /* We skip the first page because the space will be occupied by the PE headers after conversion. */
+        . = CONSTANT(MAXPAGESIZE);
+        .text ALIGN(CONSTANT(MAXPAGESIZE)) : {
+                *(.text .text.*)
+        }
+        .rodata ALIGN(CONSTANT(MAXPAGESIZE)) : {
+                *(.rodata .rodata.*)
+                *(.srodata .srodata.*)
+        }
+        .data ALIGN(CONSTANT(MAXPAGESIZE)) : {
+                *(.data .data.*)
+                *(.sdata .sdata.*)
+                *(.got .got.*)
+                *(.got.plt .got.plt.*)
+
+                /* EDK2 says some firmware cannot handle BSS sections properly. */
+                *(.bss .bss.*)
+                *(.sbss .sbss.*)
+                *(COMMON)
+        }
+
+        .sdmagic ALIGN(CONSTANT(MAXPAGESIZE)) : { *(.sdmagic) }
+        .osrel   ALIGN(CONSTANT(MAXPAGESIZE)) : { *(.osrel) }
+        .sbat    ALIGN(CONSTANT(MAXPAGESIZE)) : { *(.sbat) }
+
+        /* These are used for PE conversion and then discarded. */
+        .dynsym   : { *(.dynsym) }
+        .dynstr   : { *(.dynstr) }
+        .dynamic  : { *(.dynamic) }
+        .rel.dyn  : { *(.rel.dyn) }
+        .rela.dyn : { *(.rela.dyn) }
+
+        /* These aren't needed and could be discarded. Just in case that they're useful to the debugger
+         * we keep them, but move them out of the way to keep the PE binary more compact. */
+        .ARM.exidx         : { *(.ARM.exidx) }
+        .eh_frame          : { *(.eh_frame) }
+        .eh_frame_hdr      : { *(.eh_frame_hdr) }
+        .gnu.hash          : { *(.gnu.hash) }
+        .hash              : { *(.hash) }
+        .note.gnu.build-id : { *(.note.gnu.build-id ) }
+
+        /DISCARD/ : {
+                *(.ARM.attributes)
+                *(.comment)
+                *(.note.*)
+                *(.riscv.attributes)
+        }
+}