diff --git a/lib/systems/doubles.nix b/lib/systems/doubles.nix
index 23a44d02e85e..383dd30bfdb2 100644
--- a/lib/systems/doubles.nix
+++ b/lib/systems/doubles.nix
@@ -68,6 +68,7 @@ in {
   none = [];
 
   arm           = filterDoubles predicates.isAarch32;
+  armv7         = filterDoubles predicates.isArmv7;
   aarch64       = filterDoubles predicates.isAarch64;
   x86           = filterDoubles predicates.isx86;
   i686          = filterDoubles predicates.isi686;
@@ -75,6 +76,7 @@ in {
   microblaze    = filterDoubles predicates.isMicroBlaze;
   mips          = filterDoubles predicates.isMips;
   mmix          = filterDoubles predicates.isMmix;
+  power         = filterDoubles predicates.isPower;
   riscv         = filterDoubles predicates.isRiscV;
   riscv32       = filterDoubles predicates.isRiscV32;
   riscv64       = filterDoubles predicates.isRiscV64;
@@ -83,6 +85,7 @@ in {
   or1k          = filterDoubles predicates.isOr1k;
   m68k          = filterDoubles predicates.isM68k;
   s390          = filterDoubles predicates.isS390;
+  s390x         = filterDoubles predicates.isS390x;
   js            = filterDoubles predicates.isJavaScript;
 
   bigEndian     = filterDoubles predicates.isBigEndian;
diff --git a/lib/systems/inspect.nix b/lib/systems/inspect.nix
index 270be3a43cd3..a5fed5acf2c5 100644
--- a/lib/systems/inspect.nix
+++ b/lib/systems/inspect.nix
@@ -22,6 +22,9 @@ rec {
     ];
     isx86          = { cpu = { family = "x86"; }; };
     isAarch32      = { cpu = { family = "arm"; bits = 32; }; };
+    isArmv7        = map ({ arch, ... }: { cpu = { inherit arch; }; })
+                       (lib.filter (cpu: lib.hasPrefix "armv7" cpu.arch or "")
+                         (lib.attrValues cpuTypes));
     isAarch64      = { cpu = { family = "arm"; bits = 64; }; };
     isAarch        = { cpu = { family = "arm"; }; };
     isMicroBlaze   = { cpu = { family = "microblaze"; }; };
@@ -44,6 +47,7 @@ rec {
     isOr1k         = { cpu = { family = "or1k"; }; };
     isM68k         = { cpu = { family = "m68k"; }; };
     isS390         = { cpu = { family = "s390"; }; };
+    isS390x        = { cpu = { family = "s390"; bits = 64; }; };
     isJavaScript   = { cpu = cpuTypes.js; };
 
     is32bit        = { cpu = { bits = 32; }; };
diff --git a/lib/tests/systems.nix b/lib/tests/systems.nix
index 27c5ff565ca0..88e2e4206d56 100644
--- a/lib/tests/systems.nix
+++ b/lib/tests/systems.nix
@@ -16,12 +16,15 @@ with lib.systems.doubles; lib.runTests {
   testall = mseteq all (linux ++ darwin ++ freebsd ++ openbsd ++ netbsd ++ illumos ++ wasi ++ windows ++ embedded ++ mmix ++ js ++ genode ++ redox);
 
   testarm = mseteq arm [ "armv5tel-linux" "armv6l-linux" "armv6l-netbsd" "armv6l-none" "armv7a-linux" "armv7a-netbsd" "armv7l-linux" "armv7l-netbsd" "arm-none" "armv7a-darwin" ];
+  testarmv7 = mseteq armv7 [ "armv7a-darwin" "armv7a-linux" "armv7l-linux" "armv7a-netbsd" "armv7l-netbsd" ];
   testi686 = mseteq i686 [ "i686-linux" "i686-freebsd13" "i686-genode" "i686-netbsd" "i686-openbsd" "i686-cygwin" "i686-windows" "i686-none" "i686-darwin" ];
   testmips = mseteq mips [ "mips64el-linux" "mipsel-linux" "mipsel-netbsd" ];
   testmmix = mseteq mmix [ "mmix-mmixware" ];
+  testpower = mseteq power [ "powerpc-netbsd" "powerpc-none" "powerpc64-linux" "powerpc64le-linux" "powerpcle-none" ];
   testriscv = mseteq riscv [ "riscv32-linux" "riscv64-linux" "riscv32-netbsd" "riscv64-netbsd" "riscv32-none" "riscv64-none" ];
   testriscv32 = mseteq riscv32 [ "riscv32-linux" "riscv32-netbsd" "riscv32-none" ];
   testriscv64 = mseteq riscv64 [ "riscv64-linux" "riscv64-netbsd" "riscv64-none" ];
+  tests390x = mseteq s390x [ "s390x-linux" "s390x-none" ];
   testx86_64 = mseteq x86_64 [ "x86_64-linux" "x86_64-darwin" "x86_64-freebsd13" "x86_64-genode" "x86_64-redox" "x86_64-openbsd" "x86_64-netbsd" "x86_64-cygwin" "x86_64-solaris" "x86_64-windows" "x86_64-none" ];
 
   testcygwin = mseteq cygwin [ "i686-cygwin" "x86_64-cygwin" ];
diff --git a/pkgs/development/tools/analysis/valgrind/default.nix b/pkgs/development/tools/analysis/valgrind/default.nix
index 25a7211ef49d..ea45813303a6 100644
--- a/pkgs/development/tools/analysis/valgrind/default.nix
+++ b/pkgs/development/tools/analysis/valgrind/default.nix
@@ -119,13 +119,9 @@ stdenv.mkDerivation rec {
     license = lib.licenses.gpl2Plus;
 
     maintainers = [ lib.maintainers.eelco ];
-    platforms = lib.platforms.unix;
-    badPlatforms = [
-      "armv5tel-linux" "armv6l-linux" "armv6m-linux"
-      "sparc-linux" "sparc64-linux"
-      "riscv32-linux" "riscv64-linux"
-      "alpha-linux"
-    ];
+    platforms = with lib.platforms; lib.intersectLists
+      (x86 ++ power ++ s390x ++ armv7 ++ aarch64 ++ mips)
+      (darwin ++ freebsd ++ illumos ++ linux);
     broken = stdenv.isDarwin || stdenv.hostPlatform.isStatic; # https://hydra.nixos.org/build/128521440/nixlog/2
   };
 }