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Add more bare-metal 32-bit Arm support #1753

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Merged
NobodyXu merged 6 commits into from
Jun 10, 2026
+53 −16
Merged

Add more bare-metal 32-bit Arm support #1753

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eb1a2fb
Add missing default compiler name for ARMv4T, ARMv5TE and ARMv6 bare-…
jonathanpallant Jun 9, 2026
5d5b406
Add clarifying comments to Arm target setup code
jonathanpallant Jun 9, 2026
bf5f862
Document and organise Arm M-Profile targets
jonathanpallant Jun 9, 2026
93ff14a
Document and organise Armv7-A and Armv7-R targets
jonathanpallant Jun 9, 2026
b6289fa
Add ARMv6 support
jonathanpallant Jun 9, 2026
fa1aa64
Add Armv8-R support
jonathanpallant Jun 9, 2026
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69 changes: 53 additions & 16 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2444,63 +2444,93 @@ impl Build {
cmd.args.push("-Wl,-melf_i386".into());
}

//
// Arm Target Details
//

// Set Float ABI for all Arm bare-metal targets using EABIHF
if target.arch == "arm" && target.os == "none" && target.abi == "eabihf" {
cmd.args.push("-mfloat-abi=hard".into())
}
// Set -mthumb for all Thumb targets
if target.full_arch.starts_with("thumb") {
cmd.args.push("-mthumb".into());
}
// Armv6-M targets (no FPU available)
if target.full_arch.starts_with("thumbv6m") {
// ARMv6S-M is an old name for "ARMv6-M with SVC support"
// before SVC support became mandatory. Some versions of GAS care
// about the difference.
cmd.args.push("-march=armv6s-m".into());
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}
// Armv7-M targets (no FPU available)
if target.full_arch.starts_with("thumbv7m") {
cmd.args.push("-march=armv7-m".into());
}
// Armv7E-M targets
if target.full_arch.starts_with("thumbv7em") {
cmd.args.push("-march=armv7e-m".into());

if target.abi == "eabihf" {
cmd.args.push("-mfpu=fpv4-sp-d16".into())
}
}
if target.full_arch.starts_with("thumbv7m") {
cmd.args.push("-march=armv7-m".into());
}
// Armv8-M Baseline (no FPU available)
if target.full_arch.starts_with("thumbv8m.base") {
cmd.args.push("-march=armv8-m.base".into());
}
// Armv8-M Mainline targets
if target.full_arch.starts_with("thumbv8m.main") {
cmd.args.push("-march=armv8-m.main".into());

if target.abi == "eabihf" {
cmd.args.push("-mfpu=fpv5-sp-d16".into())
}
}
if target.full_arch.starts_with("armebv7r") | target.full_arch.starts_with("armv7r")
// ARMv6 targets
if target.full_arch.starts_with("armv6")
|| (target.full_arch.starts_with("thumbv6")
&& !target.full_arch.starts_with("thumbv6m"))
{
cmd.args.push("-march=armv6".into());
if target.abi == "eabihf" {
// lowest common denominator FPU
cmd.args.push("-mfpu=vfpv2".into());
}
}
// ARMv7-R targets
if target.full_arch.starts_with("armebv7r")
|| target.full_arch.starts_with("armv7r")
|| target.full_arch.starts_with("thumbv7r")
{
if target.full_arch.starts_with("armeb") {
cmd.args.push("-mbig-endian".into());
} else {
cmd.args.push("-mlittle-endian".into());
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}

// ARM mode
cmd.args.push("-marm".into());

// R Profile
cmd.args.push("-march=armv7-r".into());

if target.abi == "eabihf" {
// lowest common denominator FPU
// (see Cortex-R4 technical reference manual)
cmd.args.push("-mfpu=vfpv3-d16".into())
}
}
if target.full_arch.starts_with("armv7a") {
// Armv7-A targets
if target.full_arch.starts_with("armv7a")
|| target.full_arch.starts_with("thumbv7a")
{
cmd.args.push("-march=armv7-a".into());

if target.abi == "eabihf" {
// lowest common denominator FPU
cmd.args.push("-mfpu=vfpv3-d16".into());
}
}
// Armv8-R targets
if target.full_arch.starts_with("armv8r")
|| target.full_arch.starts_with("thumbv8r")
{
cmd.args.push("-march=armv8-r".into());
if target.abi == "eabihf" {
cmd.args.push("-mfpu=fp-armv8".into())
}
}

if target.arch == "riscv32" || target.arch == "riscv64" {
// get the 32i/32imac/32imc/64gc/64imac/... part
let arch = &target.full_arch[5..];
Expand Down Expand Up @@ -3708,13 +3738,20 @@ impl Build {
"sparc64-unknown-linux-gnu" => Some("sparc64-linux-gnu"),
"sparc64-unknown-netbsd" => Some("sparc64--netbsd"),
"sparcv9-sun-solaris" => Some("sparcv9-sun-solaris"),
"armv4t-none-eabi" => Some("arm-none-eabi"),
"armv5te-none-eabi" => Some("arm-none-eabi"),
"armv6-none-eabi" => Some("arm-none-eabi"),
"armv6-none-eabihf" => Some("arm-none-eabi"),
"armv7a-none-eabi" => Some("arm-none-eabi"),
"armv7a-none-eabihf" => Some("arm-none-eabi"),
"armebv7r-none-eabi" => Some("arm-none-eabi"),
"armebv7r-none-eabihf" => Some("arm-none-eabi"),
"armv7r-none-eabi" => Some("arm-none-eabi"),
"armv7r-none-eabihf" => Some("arm-none-eabi"),
"armv8r-none-eabihf" => Some("arm-none-eabi"),
"thumbv4t-none-eabi" => Some("arm-none-eabi"),
"thumbv5te-none-eabi" => Some("arm-none-eabi"),
"thumbv6-none-eabi" => Some("arm-none-eabi"),
"thumbv7a-none-eabi" => Some("arm-none-eabi"),
"thumbv7a-none-eabihf" => Some("arm-none-eabi"),
"thumbv7r-none-eabi" => Some("arm-none-eabi"),
Expand Down
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