[PULL 1/6] linux-user/hppa: add coredump support

[Helge Deller <deller@kernel.org>]

From: Matt Turner <mattst88@gmail.com>

Add HAVE_ELF_CORE_DUMP, target_elf_gregset_t (80 entries matching
arch/parisc/include/uapi/asm/ptrace.h), and elf_core_copy_regs().

The struct layout matches the kernel's struct user_regs_struct:
  gr[0..31]    at indices [0..31]   (PSW in gr[0])
  sr[0..7]     at indices [32..39]
  iaoq[0..1]   at indices [40..41]  (instruction address queue)
  iasq[0..1]   at indices [42..43]
  sar          at index   [44]      (shift amount / CR11)
  iir          at index   [45]      (interrupt instruction register)
  isr          at index   [46]      (interrupt space register)
  ior          at index   [47]      (interrupt offset register)
  ipsw         at index   [48]      (interrupt PSW / CR22)
  cr0          at index   [49]      (recovery counter)
  cr24_31[8]   at indices [50..57]
  cr8_15[6]    at indices [58..63]
  pad[16]      at indices [64..79]

elf_core_copy_regs() saves GRs, IAOQ (front/back), and SAR.

Signed-off-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Helge Deller <deller@gmx.de>
Signed-off-by: Helge Deller <deller@gmx.de>
---
 linux-user/hppa/elfload.c    | 13 +++++++++++++
 linux-user/hppa/target_elf.h | 21 +++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/linux-user/hppa/elfload.c b/linux-user/hppa/elfload.c
index 7f7ece6dc1..3354e1b840 100644
--- a/linux-user/hppa/elfload.c
+++ b/linux-user/hppa/elfload.c
@@ -16,6 +16,19 @@ const char *get_elf_platform(CPUState *cs)
     return "PARISC";
 }
 
+void elf_core_copy_regs(target_elf_gregset_t *r, const CPUArchState *env)
+{
+    int i;
+
+    memset(r, 0, sizeof(*r));
+    for (i = 0; i < 32; i++) {
+        r->gr[i] = tswapal(env->gr[i]);
+    }
+    r->iaoq[0] = tswapal(env->iaoq_f);
+    r->iaoq[1] = tswapal(env->iaoq_b);
+    r->sar     = tswapal(env->cr[CR_SAR]);
+}
+
 bool init_guest_commpage(void)
 {
     /* If reserved_va, then we have already mapped 0 page on the host. */
diff --git a/linux-user/hppa/target_elf.h b/linux-user/hppa/target_elf.h
index 76930c9369..e1c5033242 100644
--- a/linux-user/hppa/target_elf.h
+++ b/linux-user/hppa/target_elf.h
@@ -12,6 +12,27 @@
 #define ELF_MACHINE             EM_PARISC
 
 #define HAVE_ELF_PLATFORM       1
+#define HAVE_ELF_CORE_DUMP      1
+
+/*
+ * Matches struct user_regs_struct from arch/parisc/include/uapi/asm/ptrace.h.
+ * ELF_NGREG = 80; register indices match those used by libunwind and gdb.
+ */
+typedef struct target_elf_gregset_t {
+    abi_ulong gr[32];      /* gr[0..31]; PSW in gr[0]            [0..31] */
+    abi_ulong sr[8];       /* space registers                    [32..39] */
+    abi_ulong iaoq[2];     /* instruction address offset         [40..41] */
+    abi_ulong iasq[2];     /* instruction address space          [42..43] */
+    abi_ulong sar;         /* shift amount register (CR11)       [44] */
+    abi_ulong iir;         /* interrupt instruction register     [45] */
+    abi_ulong isr;         /* interrupt space register           [46] */
+    abi_ulong ior;         /* interrupt offset register          [47] */
+    abi_ulong ipsw;        /* interrupt PSW (CR22)               [48] */
+    abi_ulong cr0;         /* recovery counter                   [49] */
+    abi_ulong cr24_31[8];  /* cr24..cr31                         [50..57] */
+    abi_ulong cr8_15[6];   /* cr8, cr9, cr12, cr13, cr10, cr15  [58..63] */
+    abi_ulong pad[16];     /* pad to 80 elements                 [64..79] */
+} target_elf_gregset_t;
 
 #define LO_COMMPAGE             0
 #define STACK_GROWS_DOWN        0
-- 
2.54.0