[Buildroot] [PATCH 1/3] arch: add support for loongarch64

[Buildroot] [PATCH 1/3] arch: add support for loongarch64

[Waldemar Brodkorb]

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
---
 arch/Config.in             | 12 ++++++++++++
 arch/Config.in.loongarch64 | 14 ++++++++++++++
 package/glibc/Config.in    |  1 +
 package/musl/Config.in     |  1 +
 4 files changed, 28 insertions(+)
 create mode 100644 arch/Config.in.loongarch64

diff --git a/arch/Config.in b/arch/Config.in
index f39c33ef7f..070a4aca3a 100644
--- a/arch/Config.in
+++ b/arch/Config.in
@@ -77,6 +77,14 @@ config BR2_i386
 	  Intel i386 architecture compatible microprocessor
 	  http://en.wikipedia.org/wiki/I386
 
+config BR2_loongarch64
+	bool "loongarch64"
+	select BR2_ARCH_IS_64
+	select BR2_USE_MMU
+	help
+	  Loongarch is a RISC microprocessor from Loongarch Technologies.
+	  https://en.wikipedia.org/wiki/Loongson
+
 config BR2_m68k
 	bool "m68k"
 	# MMU support is set by the subarchitecture file, arch/Config.in.m68k
@@ -374,6 +382,10 @@ if BR2_arm || BR2_armeb || BR2_aarch64 || BR2_aarch64_be
 source "arch/Config.in.arm"
 endif
 
+if BR2_loongarch64
+source "arch/Config.in.loongarch64"
+endif
+
 if BR2_m68k
 source "arch/Config.in.m68k"
 endif
diff --git a/arch/Config.in.loongarch64 b/arch/Config.in.loongarch64
new file mode 100644
index 0000000000..2b5bac095d
--- /dev/null
+++ b/arch/Config.in.loongarch64
@@ -0,0 +1,14 @@
+config BR2_ARCH
+	default "loongarch64"
+
+config BR2_NORMALIZED_ARCH
+	default "loongarch"
+
+config BR2_ENDIAN
+	default "LITTLE"
+
+config BR2_READELF_ARCH_NAME
+	default "LoongArch"
+
+# vim: ft=kconfig
+# -*- mode:kconfig; -*-
diff --git a/package/glibc/Config.in b/package/glibc/Config.in
index 81c64083f4..5385e2a855 100644
--- a/package/glibc/Config.in
+++ b/package/glibc/Config.in
@@ -5,6 +5,7 @@ config BR2_PACKAGE_GLIBC_ARCH_SUPPORTS
 	default y if BR2_aarch64
 	default y if BR2_aarch64_be
 	default y if BR2_i386
+	default y if BR2_loongarch64
 	default y if BR2_m68k_m68k
 	default y if BR2_mips
 	default y if BR2_mipsel
diff --git a/package/musl/Config.in b/package/musl/Config.in
index a6e2af054c..70475326f5 100644
--- a/package/musl/Config.in
+++ b/package/musl/Config.in
@@ -5,6 +5,7 @@ config BR2_PACKAGE_MUSL_ARCH_SUPPORTS
 	default y if BR2_arm
 	default y if BR2_armeb
 	default y if BR2_i386
+	default y if BR2_loongarch64
 	default y if BR2_m68k_m68k
 	default y if BR2_microblaze
 	default y if BR2_mips
-- 
2.30.2

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Re: [Buildroot] [PATCH 1/3] arch: add support for loongarch64

[Thomas Petazzoni via buildroot]

On Tue, 14 May 2024 08:26:09 +0200
Waldemar Brodkorb <wbx@openadk.org> wrote:

> Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
> ---
>  arch/Config.in             | 12 ++++++++++++
>  arch/Config.in.loongarch64 | 14 ++++++++++++++
>  package/glibc/Config.in    |  1 +
>  package/musl/Config.in     |  1 +
>  4 files changed, 28 insertions(+)
>  create mode 100644 arch/Config.in.loongarch64

This needs an entry in the DEVELOPERS file.

Is this architecture supported in all versions of binutils/gcc/gdb we
support?

> diff --git a/arch/Config.in.loongarch64 b/arch/Config.in.loongarch64
> new file mode 100644
> index 0000000000..2b5bac095d
> --- /dev/null
> +++ b/arch/Config.in.loongarch64
> @@ -0,0 +1,14 @@
> +config BR2_ARCH
> +	default "loongarch64"
> +
> +config BR2_NORMALIZED_ARCH
> +	default "loongarch"
> +
> +config BR2_ENDIAN
> +	default "LITTLE"
> +
> +config BR2_READELF_ARCH_NAME
> +	default "LoongArch"
> +

Based on the gcc documentation, I see two -march values:

     ‘loongarch64’
          A generic CPU with 64-bit extensions.
     ‘la464’
          LoongArch LA464 CPU with LBT, LSX, LASX, LVZ.

And also 3 ABIs:

     ‘lp64d’
          Uses 64-bit general purpose registers and 32/64-bit
          floating-point registers for parameter passing.  Data model is
          LP64, where ‘int’ is 32 bits, while ‘long int’ and pointers
          are 64 bits.
     ‘lp64f’
          Uses 64-bit general purpose registers and 32-bit
          floating-point registers for parameter passing.  Data model is
          LP64, where ‘int’ is 32 bits, while ‘long int’ and pointers
          are 64 bits.
     ‘lp64s’
          Uses 64-bit general purpose registers and no floating-point
          registers for parameter passing.  Data model is LP64, where
          ‘int’ is 32 bits, while ‘long int’ and pointers are 64 bits.

Should we do something about this?

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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