diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index f7625c0952..b05b8b0c6b 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -2445,6 +2445,9 @@ static int wmr_write_region(void *opaque, vaddr start,
  * handler (provided that target process haven't registered
  * handler for that) that does the dump when signal is received.
  */
+#ifdef TARGET_SPARC
+#include "sparc/cpu_loop.h"
+#endif
 static int elf_core_dump(int signr, const CPUArchState *env)
 {
     const CPUState *cpu = env_cpu_const(env);
@@ -2468,6 +2471,12 @@ static int elf_core_dump(int signr, const CPUArchState *env)
     cpu_list_lock();
     mmap_lock();
 
+#ifdef TARGET_SPARC
+    CPU_FOREACH(cpu_iter) {
+        flush_windows(cpu_env(cpu_iter));
+    }
+#endif
+
     /* By unprotecting, we merge vmas that might be split. */
     walk_memory_regions(NULL, wmr_page_unprotect_regions);
 
diff --git a/linux-user/sparc/cpu_loop.c b/linux-user/sparc/cpu_loop.c
index ab633eeae3..0aacda9448 100644
--- a/linux-user/sparc/cpu_loop.c
+++ b/linux-user/sparc/cpu_loop.c
@@ -22,6 +22,7 @@
 #include "user-internals.h"
 #include "user/cpu_loop.h"
 #include "signal-common.h"
+#include "sparc/cpu_loop.h"
 
 #define SPARC64_STACK_BIAS 2047
 
@@ -119,7 +120,7 @@ static void restore_window(CPUSPARCState *env)
 #endif
 }
 
-static void flush_windows(CPUSPARCState *env)
+void flush_windows(CPUSPARCState *env)
 {
     int offset, cwp1;
 
diff --git a/linux-user/sparc/cpu_loop.h b/linux-user/sparc/cpu_loop.h
new file mode 100644
index 0000000000..fb6e82d372
--- /dev/null
+++ b/linux-user/sparc/cpu_loop.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef SPARC_CPU_LOOP_H
+#define SPARC_CPU_LOOP_H
+
+void flush_windows(CPUSPARCState *env);
+
+#endif
diff --git a/linux-user/sparc/elfload.c b/linux-user/sparc/elfload.c
index e6387ec891..181f1e00b5 100644
--- a/linux-user/sparc/elfload.c
+++ b/linux-user/sparc/elfload.c
@@ -12,16 +12,41 @@ void elf_core_copy_regs(target_elf_gregset_t *r, const CPUArchState *env)
     CPUSPARCState *e = (CPUSPARCState *)env;
     int i;
 
+    memset(r, 0, sizeof(*r));
+
 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
+    /* Linux kernel layout for sparc64 (arch/sparc/include/asm/elf_64.h):
+     *   [0..7]   G0-G7
+     *   [8..15]  O0-O7
+     *   [16..23] L0-L7
+     *   [24..31] I0-I7
+     *   [32]     TSTATE
+     *   [33]     TPC
+     *   [34]     TNPC
+     *   [35]     Y
+     */
     for (i = 0; i < 8; i++) {
-        r->regs[i]     = tswap64(env->gregs[i]);
-        r->regs[8 + i] = tswap64(env->regwptr[WREG_O0 + i]);
+        r->regs[i]      = tswap64(env->gregs[i]);
+        r->regs[8 + i]  = tswap64(env->regwptr[WREG_O0 + i]);
+        r->regs[16 + i] = tswap64(env->regwptr[WREG_L0 + i]);
+        r->regs[24 + i] = tswap64(env->regwptr[WREG_I0 + i]);
     }
-    r->regs[16] = tswap64(sparc64_tstate(e));
-    r->regs[17] = tswap64(env->pc);
-    r->regs[18] = tswap64(env->npc);
-    r->regs[19] = tswap64(env->y);
+    r->regs[32] = tswap64(sparc64_tstate(e));
+    r->regs[33] = tswap64(env->pc);
+    r->regs[34] = tswap64(env->npc);
+    r->regs[35] = tswap64(env->y);
 #else
+    /* Linux kernel layout for sparc32 (arch/sparc/include/asm/elf_32.h):
+     *   [0]      PSR
+     *   [1]      PC
+     *   [2]      NPC
+     *   [3]      Y
+     *   [4..11]  G0-G7
+     *   [12..19] O0-O7
+     *   [20..27] L0-L7
+     *   [28..35] I0-I7
+     *   [36..37] reserved (stack_check)
+     */
     r->regs[0] = tswap32(cpu_get_psr(e));
     r->regs[1] = tswap32(env->pc);
     r->regs[2] = tswap32(env->npc);
@@ -29,6 +54,8 @@ void elf_core_copy_regs(target_elf_gregset_t *r, const CPUArchState *env)
     for (i = 0; i < 8; i++) {
         r->regs[4 + i]  = tswap32(env->gregs[i]);
         r->regs[12 + i] = tswap32(env->regwptr[WREG_O0 + i]);
+        r->regs[20 + i] = tswap32(env->regwptr[WREG_L0 + i]);
+        r->regs[28 + i] = tswap32(env->regwptr[WREG_I0 + i]);
     }
 #endif
 }
diff --git a/linux-user/sparc/target_elf.h b/linux-user/sparc/target_elf.h
index edb0b3103c..365af864b0 100644
--- a/linux-user/sparc/target_elf.h
+++ b/linux-user/sparc/target_elf.h
@@ -24,12 +24,21 @@
 #define HAVE_ELF_CORE_DUMP      1
 
 /*
- * Matches the kernel's elf_gregset_t (ELF_NGREG = 20).
- * sparc32/sparc32plus: psr, pc, npc, y, u_regs[16] (g0-g7, o0-o7)
- * sparc64:             u_regs[16] (g0-g7, o0-o7), tstate, pc, npc, y
+ * Matches the kernel's elf_gregset_t.
+ *   sparc32/sparc32plus (ELF_NGREG = 38):
+ *     psr, pc, npc, y, u_regs[16] (g0-g7, o0-o7),
+ *     reg_window[16] (l0-l7, i0-i7), stack_check[2]
+ *   sparc64             (ELF_NGREG = 36):
+ *     u_regs[16] (g0-g7, o0-o7), reg_window[16] (l0-l7, i0-i7),
+ *     tstate, tpc, tnpc, y
  */
+#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
+# define TARGET_ELF_NGREG       36
+#else
+# define TARGET_ELF_NGREG       38
+#endif
 typedef struct target_elf_gregset_t {
-    abi_ulong regs[20];
+    abi_ulong regs[TARGET_ELF_NGREG];
 } target_elf_gregset_t;
 
 #endif