linux-user/xtensa: Expand target_elf_gregset_t

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/xtensa/elfload.c

@@ -11,36 +11,21 @@ const char *get_elf_cpu_model(uint32_t eflags)
     return XTENSA_DEFAULT_CPU_MODEL;
 }
 
-#define tswapreg(ptr)   tswapal(ptr)
-
-enum {
-    TARGET_REG_PC,
-    TARGET_REG_PS,
-    TARGET_REG_LBEG,
-    TARGET_REG_LEND,
-    TARGET_REG_LCOUNT,
-    TARGET_REG_SAR,
-    TARGET_REG_WINDOWSTART,
-    TARGET_REG_WINDOWBASE,
-    TARGET_REG_THREADPTR,
-    TARGET_REG_AR0 = 64,
-};
-
 void elf_core_copy_regs(target_elf_gregset_t *r, const CPUXtensaState *env)
 {
-    unsigned i;
+    r->pt.pc = tswap32(env->pc);
+    r->pt.ps = tswap32(env->sregs[PS] & ~PS_EXCM);
+    r->pt.lbeg = tswap32(env->sregs[LBEG]);
+    r->pt.lend = tswap32(env->sregs[LEND]);
+    r->pt.lcount = tswap32(env->sregs[LCOUNT]);
+    r->pt.sar = tswap32(env->sregs[SAR]);
+    r->pt.windowstart = tswap32(env->sregs[WINDOW_START]);
+    r->pt.windowbase = tswap32(env->sregs[WINDOW_BASE]);
+    r->pt.threadptr = tswap32(env->uregs[THREADPTR]);
 
-    r->regs[TARGET_REG_PC] = tswapreg(env->pc);
-    r->regs[TARGET_REG_PS] = tswapreg(env->sregs[PS] & ~PS_EXCM);
-    r->regs[TARGET_REG_LBEG] = tswapreg(env->sregs[LBEG]);
-    r->regs[TARGET_REG_LEND] = tswapreg(env->sregs[LEND]);
-    r->regs[TARGET_REG_LCOUNT] = tswapreg(env->sregs[LCOUNT]);
-    r->regs[TARGET_REG_SAR] = tswapreg(env->sregs[SAR]);
-    r->regs[TARGET_REG_WINDOWSTART] = tswapreg(env->sregs[WINDOW_START]);
-    r->regs[TARGET_REG_WINDOWBASE] = tswapreg(env->sregs[WINDOW_BASE]);
-    r->regs[TARGET_REG_THREADPTR] = tswapreg(env->uregs[THREADPTR]);
     xtensa_sync_phys_from_window((CPUXtensaState *)env);
-    for (i = 0; i < env->config->nareg; ++i) {
-        r->regs[TARGET_REG_AR0 + i] = tswapreg(env->phys_regs[i]);
+
+    for (unsigned i = 0; i < env->config->nareg; ++i) {
+        r->pt.a[i] = tswap32(env->phys_regs[i]);
     }
 }

linux-user/xtensa/target_elf.h

@@ -8,14 +8,16 @@
 #ifndef XTENSA_TARGET_ELF_H
 #define XTENSA_TARGET_ELF_H
 
-#define HAVE_ELF_CORE_DUMP      1
+#include "target_ptrace.h"
 
-typedef abi_ulong target_elf_greg_t;
+#define HAVE_ELF_CORE_DUMP      1
 
-/* See linux kernel: arch/xtensa/include/asm/elf.h.  */
-#define ELF_NREG                128
+/*
+ * See linux kernel: arch/xtensa/include/asm/elf.h, where elf_gregset_t
+ * is mapped to struct user_pt_regs via typedef and sizeof.
+ */
 typedef struct target_elf_gregset_t {
-    target_elf_greg_t regs[ELF_NREG];
+    struct target_user_pt_regs pt;
 } target_elf_gregset_t;
 
 #endif