--- zzzz-none-000/linux-4.4.271/arch/mips/kernel/binfmt_elfo32.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/arch/mips/kernel/binfmt_elfo32.c	2023-04-19 10:22:28.000000000 +0000
@@ -72,6 +72,16 @@
 
 #include <asm/processor.h>
 
+/* These MUST be defined before elf.h gets included */
+extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
+#define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
+#define ELF_CORE_COPY_TASK_REGS(_tsk, _dest)				\
+({									\
+	int __res = 1;							\
+	elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk));		\
+	__res;								\
+})
+
 #include <linux/module.h>
 #include <linux/elfcore.h>
 #include <linux/compat.h>
@@ -129,6 +139,28 @@
 	value->tv_usec = rem / NSEC_PER_USEC;
 }
 
+void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
+{
+	int i;
+
+	for (i = 0; i < MIPS32_EF_R0; i++)
+		grp[i] = 0;
+	grp[MIPS32_EF_R0] = 0;
+	for (i = 1; i <= 31; i++)
+		grp[MIPS32_EF_R0 + i] = (elf_greg_t) regs->regs[i];
+	grp[MIPS32_EF_R26] = 0;
+	grp[MIPS32_EF_R27] = 0;
+	grp[MIPS32_EF_LO] = (elf_greg_t) regs->lo;
+	grp[MIPS32_EF_HI] = (elf_greg_t) regs->hi;
+	grp[MIPS32_EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
+	grp[MIPS32_EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
+	grp[MIPS32_EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
+	grp[MIPS32_EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
+#ifdef MIPS32_EF_UNUSED0
+	grp[MIPS32_EF_UNUSED0] = 0;
+#endif
+}
+
 MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
 MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");