diff --git a/linux-user/aarch64/target_proc.h b/linux-user/aarch64/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/aarch64/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/alpha/target_proc.h b/linux-user/alpha/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/alpha/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/arm/target_proc.h b/linux-user/arm/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/arm/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/cris/target_proc.h b/linux-user/cris/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/cris/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/hexagon/target_proc.h b/linux-user/hexagon/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/hexagon/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/hppa/target_proc.h b/linux-user/hppa/target_proc.h
new file mode 100644
index 0000000..9340c3b
--- /dev/null
+++ b/linux-user/hppa/target_proc.h
@@ -0,0 +1,26 @@
+/*
+ * HPPA specific proc functions for linux-user
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#ifndef HPPA_TARGET_PROC_H
+#define HPPA_TARGET_PROC_H
+
+static int open_cpuinfo(CPUArchState *cpu_env, int fd)
+{
+    int i, num_cpus;
+
+    num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+    for (i = 0; i < num_cpus; i++) {
+        dprintf(fd, "processor\t: %d\n", i);
+        dprintf(fd, "cpu family\t: PA-RISC 1.1e\n");
+        dprintf(fd, "cpu\t\t: PA7300LC (PCX-L2)\n");
+        dprintf(fd, "capabilities\t: os32\n");
+        dprintf(fd, "model\t\t: 9000/778/B160L - "
+                    "Merlin L2 160 QEMU (9000/778/B160L)\n\n");
+    }
+    return 0;
+}
+#define HAVE_ARCH_PROC_CPUINFO
+
+#endif /* HPPA_TARGET_PROC_H */
diff --git a/linux-user/i386/target_proc.h b/linux-user/i386/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/i386/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/loongarch64/target_proc.h b/linux-user/loongarch64/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/loongarch64/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/m68k/target_proc.h b/linux-user/m68k/target_proc.h
new file mode 100644
index 0000000..3df8f28
--- /dev/null
+++ b/linux-user/m68k/target_proc.h
@@ -0,0 +1,16 @@
+/*
+ * M68K specific proc functions for linux-user
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#ifndef M68K_TARGET_PROC_H
+#define M68K_TARGET_PROC_H
+
+static int open_hardware(CPUArchState *cpu_env, int fd)
+{
+    dprintf(fd, "Model:\t\tqemu-m68k\n");
+    return 0;
+}
+#define HAVE_ARCH_PROC_HARDWARE
+
+#endif /* M68K_TARGET_PROC_H */
diff --git a/linux-user/microblaze/target_proc.h b/linux-user/microblaze/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/microblaze/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/mips/target_proc.h b/linux-user/mips/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/mips/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/mips64/target_proc.h b/linux-user/mips64/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/mips64/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/nios2/target_proc.h b/linux-user/nios2/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/nios2/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/openrisc/target_proc.h b/linux-user/openrisc/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/openrisc/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/ppc/target_proc.h b/linux-user/ppc/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/ppc/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/riscv/target_proc.h b/linux-user/riscv/target_proc.h
new file mode 100644
index 0000000..c77c003
--- /dev/null
+++ b/linux-user/riscv/target_proc.h
@@ -0,0 +1,37 @@
+/*
+ * RISC-V specific proc functions for linux-user
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#ifndef RISCV_TARGET_PROC_H
+#define RISCV_TARGET_PROC_H
+
+static int open_cpuinfo(CPUArchState *cpu_env, int fd)
+{
+    int i;
+    int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+    RISCVCPU *cpu = env_archcpu(cpu_env);
+    const RISCVCPUConfig *cfg = riscv_cpu_cfg((CPURISCVState *) cpu_env);
+    char *isa_string = riscv_isa_string(cpu);
+    const char *mmu;
+
+    if (cfg->mmu) {
+        mmu = (cpu_env->xl == MXL_RV32) ? "sv32"  : "sv48";
+    } else {
+        mmu = "none";
+    }
+
+    for (i = 0; i < num_cpus; i++) {
+        dprintf(fd, "processor\t: %d\n", i);
+        dprintf(fd, "hart\t\t: %d\n", i);
+        dprintf(fd, "isa\t\t: %s\n", isa_string);
+        dprintf(fd, "mmu\t\t: %s\n", mmu);
+        dprintf(fd, "uarch\t\t: qemu\n\n");
+    }
+
+    g_free(isa_string);
+    return 0;
+}
+#define HAVE_ARCH_PROC_CPUINFO
+
+#endif /* RISCV_TARGET_PROC_H */
diff --git a/linux-user/s390x/target_proc.h b/linux-user/s390x/target_proc.h
new file mode 100644
index 0000000..a4a4821
--- /dev/null
+++ b/linux-user/s390x/target_proc.h
@@ -0,0 +1,109 @@
+/*
+ * S390X specific proc functions for linux-user
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#ifndef S390X_TARGET_PROC_H
+#define S390X_TARGET_PROC_H
+
+/*
+ * Emulate what a Linux kernel running in qemu-system-s390x -M accel=tcg would
+ * show in /proc/cpuinfo.
+ *
+ * Skip the following in order to match the missing support in op_ecag():
+ * - show_cacheinfo().
+ * - show_cpu_topology().
+ * - show_cpu_mhz().
+ *
+ * Use fixed values for certain fields:
+ * - bogomips per cpu - from a qemu-system-s390x run.
+ * - max thread id = 0, since SMT / SIGP_SET_MULTI_THREADING is not supported.
+ *
+ * Keep the code structure close to arch/s390/kernel/processor.c.
+ */
+
+static void show_facilities(int fd)
+{
+    size_t sizeof_stfl_bytes = 2048;
+    g_autofree uint8_t *stfl_bytes = g_new0(uint8_t, sizeof_stfl_bytes);
+    unsigned int bit;
+
+    dprintf(fd, "facilities      :");
+    s390_get_feat_block(S390_FEAT_TYPE_STFL, stfl_bytes);
+    for (bit = 0; bit < sizeof_stfl_bytes * 8; bit++) {
+        if (test_be_bit(bit, stfl_bytes)) {
+            dprintf(fd, " %d", bit);
+        }
+    }
+    dprintf(fd, "\n");
+}
+
+static int cpu_ident(unsigned long n)
+{
+    return deposit32(0, CPU_ID_BITS - CPU_PHYS_ADDR_BITS, CPU_PHYS_ADDR_BITS,
+                     n);
+}
+
+static void show_cpu_summary(CPUArchState *cpu_env, int fd)
+{
+    S390CPUModel *model = env_archcpu(cpu_env)->model;
+    int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+    uint32_t elf_hwcap = get_elf_hwcap();
+    const char *hwcap_str;
+    int i;
+
+    dprintf(fd, "vendor_id       : IBM/S390\n"
+                "# processors    : %i\n"
+                "bogomips per cpu: 13370.00\n",
+            num_cpus);
+    dprintf(fd, "max thread id   : 0\n");
+    dprintf(fd, "features\t: ");
+    for (i = 0; i < sizeof(elf_hwcap) * 8; i++) {
+        if (!(elf_hwcap & (1 << i))) {
+            continue;
+        }
+        hwcap_str = elf_hwcap_str(i);
+        if (hwcap_str) {
+            dprintf(fd, "%s ", hwcap_str);
+        }
+    }
+    dprintf(fd, "\n");
+    show_facilities(fd);
+    for (i = 0; i < num_cpus; i++) {
+        dprintf(fd, "processor %d: "
+               "version = %02X,  "
+               "identification = %06X,  "
+               "machine = %04X\n",
+               i, model->cpu_ver, cpu_ident(i), model->def->type);
+    }
+}
+
+static void show_cpu_ids(CPUArchState *cpu_env, int fd, unsigned long n)
+{
+    S390CPUModel *model = env_archcpu(cpu_env)->model;
+
+    dprintf(fd, "version         : %02X\n", model->cpu_ver);
+    dprintf(fd, "identification  : %06X\n", cpu_ident(n));
+    dprintf(fd, "machine         : %04X\n", model->def->type);
+}
+
+static void show_cpuinfo(CPUArchState *cpu_env, int fd, unsigned long n)
+{
+    dprintf(fd, "\ncpu number      : %ld\n", n);
+    show_cpu_ids(cpu_env, fd, n);
+}
+
+static int open_cpuinfo(CPUArchState *cpu_env, int fd)
+{
+    int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+    int i;
+
+    show_cpu_summary(cpu_env, fd);
+    for (i = 0; i < num_cpus; i++) {
+        show_cpuinfo(cpu_env, fd, i);
+    }
+    return 0;
+}
+#define HAVE_ARCH_PROC_CPUINFO
+
+#endif /* S390X_TARGET_PROC_H */
diff --git a/linux-user/sh4/target_proc.h b/linux-user/sh4/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/sh4/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/sparc/target_proc.h b/linux-user/sparc/target_proc.h
new file mode 100644
index 0000000..3bb3134
--- /dev/null
+++ b/linux-user/sparc/target_proc.h
@@ -0,0 +1,16 @@
+/*
+ * Sparc specific proc functions for linux-user
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#ifndef SPARC_TARGET_PROC_H
+#define SPARC_TARGET_PROC_H
+
+static int open_cpuinfo(CPUArchState *cpu_env, int fd)
+{
+    dprintf(fd, "type\t\t: sun4u\n");
+    return 0;
+}
+#define HAVE_ARCH_PROC_CPUINFO
+
+#endif /* SPARC_TARGET_PROC_H */
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 9353268..faad3a5 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8339,9 +8339,11 @@
     }
 }
 
+#include "target_proc.h"
+
 #if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN || \
-    defined(TARGET_SPARC) || defined(TARGET_M68K) || defined(TARGET_HPPA) || \
-    defined(TARGET_RISCV) || defined(TARGET_S390X)
+    defined(HAVE_ARCH_PROC_CPUINFO) || \
+    defined(HAVE_ARCH_PROC_HARDWARE)
 static int is_proc(const char *filename, const char *entry)
 {
     return strcmp(filename, entry) == 0;
@@ -8393,171 +8395,6 @@
 }
 #endif
 
-#if defined(TARGET_SPARC)
-static int open_cpuinfo(CPUArchState *cpu_env, int fd)
-{
-    dprintf(fd, "type\t\t: sun4u\n");
-    return 0;
-}
-#endif
-
-#if defined(TARGET_HPPA)
-static int open_cpuinfo(CPUArchState *cpu_env, int fd)
-{
-    int i, num_cpus;
-
-    num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
-    for (i = 0; i < num_cpus; i++) {
-        dprintf(fd, "processor\t: %d\n", i);
-        dprintf(fd, "cpu family\t: PA-RISC 1.1e\n");
-        dprintf(fd, "cpu\t\t: PA7300LC (PCX-L2)\n");
-        dprintf(fd, "capabilities\t: os32\n");
-        dprintf(fd, "model\t\t: 9000/778/B160L - "
-                    "Merlin L2 160 QEMU (9000/778/B160L)\n\n");
-    }
-    return 0;
-}
-#endif
-
-#if defined(TARGET_RISCV)
-static int open_cpuinfo(CPUArchState *cpu_env, int fd)
-{
-    int i;
-    int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
-    RISCVCPU *cpu = env_archcpu(cpu_env);
-    const RISCVCPUConfig *cfg = riscv_cpu_cfg((CPURISCVState *) cpu_env);
-    char *isa_string = riscv_isa_string(cpu);
-    const char *mmu;
-
-    if (cfg->mmu) {
-        mmu = (cpu_env->xl == MXL_RV32) ? "sv32"  : "sv48";
-    } else {
-        mmu = "none";
-    }
-
-    for (i = 0; i < num_cpus; i++) {
-        dprintf(fd, "processor\t: %d\n", i);
-        dprintf(fd, "hart\t\t: %d\n", i);
-        dprintf(fd, "isa\t\t: %s\n", isa_string);
-        dprintf(fd, "mmu\t\t: %s\n", mmu);
-        dprintf(fd, "uarch\t\t: qemu\n\n");
-    }
-
-    g_free(isa_string);
-    return 0;
-}
-#endif
-
-#if defined(TARGET_S390X)
-/*
- * Emulate what a Linux kernel running in qemu-system-s390x -M accel=tcg would
- * show in /proc/cpuinfo.
- *
- * Skip the following in order to match the missing support in op_ecag():
- * - show_cacheinfo().
- * - show_cpu_topology().
- * - show_cpu_mhz().
- *
- * Use fixed values for certain fields:
- * - bogomips per cpu - from a qemu-system-s390x run.
- * - max thread id = 0, since SMT / SIGP_SET_MULTI_THREADING is not supported.
- *
- * Keep the code structure close to arch/s390/kernel/processor.c.
- */
-
-static void show_facilities(int fd)
-{
-    size_t sizeof_stfl_bytes = 2048;
-    g_autofree uint8_t *stfl_bytes = g_new0(uint8_t, sizeof_stfl_bytes);
-    unsigned int bit;
-
-    dprintf(fd, "facilities      :");
-    s390_get_feat_block(S390_FEAT_TYPE_STFL, stfl_bytes);
-    for (bit = 0; bit < sizeof_stfl_bytes * 8; bit++) {
-        if (test_be_bit(bit, stfl_bytes)) {
-            dprintf(fd, " %d", bit);
-        }
-    }
-    dprintf(fd, "\n");
-}
-
-static int cpu_ident(unsigned long n)
-{
-    return deposit32(0, CPU_ID_BITS - CPU_PHYS_ADDR_BITS, CPU_PHYS_ADDR_BITS,
-                     n);
-}
-
-static void show_cpu_summary(CPUArchState *cpu_env, int fd)
-{
-    S390CPUModel *model = env_archcpu(cpu_env)->model;
-    int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
-    uint32_t elf_hwcap = get_elf_hwcap();
-    const char *hwcap_str;
-    int i;
-
-    dprintf(fd, "vendor_id       : IBM/S390\n"
-                "# processors    : %i\n"
-                "bogomips per cpu: 13370.00\n",
-            num_cpus);
-    dprintf(fd, "max thread id   : 0\n");
-    dprintf(fd, "features\t: ");
-    for (i = 0; i < sizeof(elf_hwcap) * 8; i++) {
-        if (!(elf_hwcap & (1 << i))) {
-            continue;
-        }
-        hwcap_str = elf_hwcap_str(i);
-        if (hwcap_str) {
-            dprintf(fd, "%s ", hwcap_str);
-        }
-    }
-    dprintf(fd, "\n");
-    show_facilities(fd);
-    for (i = 0; i < num_cpus; i++) {
-        dprintf(fd, "processor %d: "
-               "version = %02X,  "
-               "identification = %06X,  "
-               "machine = %04X\n",
-               i, model->cpu_ver, cpu_ident(i), model->def->type);
-    }
-}
-
-static void show_cpu_ids(CPUArchState *cpu_env, int fd, unsigned long n)
-{
-    S390CPUModel *model = env_archcpu(cpu_env)->model;
-
-    dprintf(fd, "version         : %02X\n", model->cpu_ver);
-    dprintf(fd, "identification  : %06X\n", cpu_ident(n));
-    dprintf(fd, "machine         : %04X\n", model->def->type);
-}
-
-static void show_cpuinfo(CPUArchState *cpu_env, int fd, unsigned long n)
-{
-    dprintf(fd, "\ncpu number      : %ld\n", n);
-    show_cpu_ids(cpu_env, fd, n);
-}
-
-static int open_cpuinfo(CPUArchState *cpu_env, int fd)
-{
-    int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
-    int i;
-
-    show_cpu_summary(cpu_env, fd);
-    for (i = 0; i < num_cpus; i++) {
-        show_cpuinfo(cpu_env, fd, i);
-    }
-    return 0;
-}
-#endif
-
-#if defined(TARGET_M68K)
-static int open_hardware(CPUArchState *cpu_env, int fd)
-{
-    dprintf(fd, "Model:\t\tqemu-m68k\n");
-    return 0;
-}
-#endif
-
-
 int do_guest_openat(CPUArchState *cpu_env, int dirfd, const char *fname,
                     int flags, mode_t mode, bool safe)
 {
@@ -8578,11 +8415,10 @@
 #if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN
         { "/proc/net/route", open_net_route, is_proc },
 #endif
-#if defined(TARGET_SPARC) || defined(TARGET_HPPA) || \
-    defined(TARGET_RISCV) || defined(TARGET_S390X)
+#if defined(HAVE_ARCH_PROC_CPUINFO)
         { "/proc/cpuinfo", open_cpuinfo, is_proc },
 #endif
-#if defined(TARGET_M68K)
+#if defined(HAVE_ARCH_PROC_HARDWARE)
         { "/proc/hardware", open_hardware, is_proc },
 #endif
         { NULL, NULL, NULL }
diff --git a/linux-user/x86_64/target_proc.h b/linux-user/x86_64/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/x86_64/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */
diff --git a/linux-user/xtensa/target_proc.h b/linux-user/xtensa/target_proc.h
new file mode 100644
index 0000000..43fe29c
--- /dev/null
+++ b/linux-user/xtensa/target_proc.h
@@ -0,0 +1 @@
+/* No target-specific /proc support */