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Add VEXos "linked files" support to armv7a-vex-v5 #145578

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Merged
merged 2 commits into from
Aug 20, 2025
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Add VEXos "linked files" support to armv7a-vex-v5 #145578

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dbb8190
Add VEXos "linked files" support to `armv7a-vex-v5`
lewisfm Aug 9, 2025
0e47f19
Specify linker scripts after user link args
lewisfm Aug 9, 2025
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9 changes: 7 additions & 2 deletions compiler/rustc_codegen_ssa/src/back/link.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2435,6 +2435,13 @@ fn linker_with_args(
// Passed after compiler-generated options to support manual overriding when necessary.
add_user_defined_link_args(cmd, sess);

// ------------ Builtin configurable linker scripts ------------
// The user's link args should be able to overwrite symbols in the compiler's
// linker script that were weakly defined (i.e. defined with `PROVIDE()`). For this
// to work correctly, the user needs to be able to specify linker arguments like
// `--defsym` and `--script` *before* any builtin linker scripts are evaluated.
add_link_script(cmd, sess, tmpdir, crate_type);

// ------------ Object code and libraries, order-dependent ------------

// Post-link CRT objects.
Expand Down Expand Up @@ -2469,8 +2476,6 @@ fn add_order_independent_options(

let apple_sdk_root = add_apple_sdk(cmd, sess, flavor);

add_link_script(cmd, sess, tmpdir, crate_type);

if sess.target.os == "fuchsia"
&& crate_type == CrateType::Executable
&& !matches!(flavor, LinkerFlavor::Gnu(Cc::Yes, _))
Expand Down
27 changes: 19 additions & 8 deletions compiler/rustc_target/src/spec/targets/armv7a_vex_v5_linker_script.ld
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Expand Up @@ -17,15 +17,25 @@ PROVIDE(__vcodesig_type = 0); /* V5_SIG_TYPE_USER */
PROVIDE(__vcodesig_owner = 2); /* V5_SIG_OWNER_PARTNER */
PROVIDE(__vcodesig_options = 0); /* none (0) */

PROVIDE(__user_ram_start = 0x03800000);
PROVIDE(__user_ram_length = 48M);
PROVIDE(__user_ram_end = __user_ram_start + __user_ram_length); /* 0x8000000 */
__user_ram_start = 0x03800000;
__user_ram_end = 0x08000000;
/* (0x48 =) 72 MiB length */
__user_ram_length = __user_ram_start - __user_ram_end;

PROVIDE(__code_signature_length = 0x20);
/*
* VEXos provides a method for pre-loading a "linked file" at a specified
* address in User RAM, conventionally near the end, after the primary
* program binary. We need to be sure not to place any data in that location,
* so we allow the user of this linker script to inform the start address of
* this blob.
*/
PROVIDE(__linked_file_length = 0);
PROVIDE(__linked_file_end = __user_ram_end);
PROVIDE(__linked_file_start = __linked_file_end - __linked_file_length);

PROVIDE(__stack_length = 4M);
PROVIDE(__heap_end = __user_ram_end - __stack_length);
PROVIDE(__user_length = __heap_start - __user_ram_start);
PROVIDE(__stack_top = __linked_file_start);
PROVIDE(__stack_bottom = __linked_file_start - __stack_length);

MEMORY {
USER_RAM (RWX) : ORIGIN = __user_ram_start, LENGTH = __user_ram_length
Expand All @@ -44,7 +54,7 @@ SECTIONS {
LONG(__vcodesig_options)

FILL(0)
. = __user_ram_start + __code_signature_length;
. = __user_ram_start + 0x20;
} > USER_RAM

/*
Expand Down Expand Up @@ -125,7 +135,8 @@ SECTIONS {
*/
.heap (NOLOAD) : {
__heap_start = .;
. = __heap_end;
. = __stack_bottom;
__heap_end = .;
} > USER_RAM

.stack (NOLOAD) : ALIGN(8) {
Expand Down
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