Make use of the fact that target_elf_gregset_t is a proper structure.
Drop ELF_NREG, target_elf_greg_t, and tswapreg.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/openrisc/target_elf.h | 12 +++++++-----
 linux-user/openrisc/elfload.c    |  8 +++-----
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/linux-user/openrisc/target_elf.h b/linux-user/openrisc/target_elf.h
index e97bdc11ed..ad80e4b41a 100644
--- a/linux-user/openrisc/target_elf.h
+++ b/linux-user/openrisc/target_elf.h
@@ -8,14 +8,16 @@
 #ifndef OPENRISC_TARGET_ELF_H
 #define OPENRISC_TARGET_ELF_H
 
+#include "target_ptrace.h"
+
 #define HAVE_ELF_CORE_DUMP      1
 
-typedef abi_ulong target_elf_greg_t;
-
-/* See linux kernel arch/openrisc/include/asm/elf.h.  */
-#define ELF_NREG                34 /* gprs and pc, sr */
+/*
+ * See linux kernel: arch/openrisc/include/uapi/asm/elf.h, where
+ * elf_gregset_t is mapped to struct user_regs_struct via sizeof.
+ */
 typedef struct target_elf_gregset_t {
-    target_elf_greg_t regs[ELF_NREG];
+    struct target_user_regs_struct pt;
 } target_elf_gregset_t;
 
 #endif
diff --git a/linux-user/openrisc/elfload.c b/linux-user/openrisc/elfload.c
index bb5ad96711..6bf02bf58d 100644
--- a/linux-user/openrisc/elfload.c
+++ b/linux-user/openrisc/elfload.c
@@ -11,13 +11,11 @@ const char *get_elf_cpu_model(uint32_t eflags)
     return "any";
 }
 
-#define tswapreg(ptr)   tswapal(ptr)
-
 void elf_core_copy_regs(target_elf_gregset_t *r, const CPUOpenRISCState *env)
 {
     for (int i = 0; i < 32; i++) {
-        r->regs[i] = tswapreg(cpu_get_gpr(env, i));
+        r->pt.gpr[i] = tswapal(cpu_get_gpr(env, i));
     }
-    r->regs[32] = tswapreg(env->pc);
-    r->regs[33] = tswapreg(cpu_get_sr(env));
+    r->pt.pc = tswapal(env->pc);
+    r->pt.sr = tswapal(cpu_get_sr(env));
 }
-- 
2.43.0