l4re-base-25.08.0

src/l4/pkg/libunwind/lib/contrib/tests/ppc64-test-plt.c

@@ -0,0 +1,185 @@
+/**
+ * Unittest PPC64 is_plt_entry function by inspecting output at
+ * different points in a mock PLT address space.
+ */
+/*
+ * This file is part of libunwind.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "dwarf.h"
+#include "libunwind_i.h"
+
+#undef unw_get_accessors_int
+unw_accessors_t *unw_get_accessors_int (unw_addr_space_t unused) { return NULL; }
+int dwarf_step (struct dwarf_cursor* unused) { return 0; }
+
+enum
+{
+  ip_guard0,
+  ip_std,
+  ip_ld,
+  ip_mtctr,
+  ip_bctr,
+  ip_guard1,
+
+  ip_program_end
+};
+
+/* Mock access_mem implementation */
+static int
+access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write,
+            void *arg)
+{
+  if (write != 0)
+    return -1;
+
+  const size_t mem_size   = ip_program_end * sizeof(uint32_t);
+  const void *mem_start   = arg;
+  const void *mem_end     = (const char*) arg + mem_size;
+  const unw_word_t *paddr = (const unw_word_t*) addr;
+
+  if ((void*) paddr < mem_start || (void*) paddr > mem_end)
+    {
+      return -1;
+    }
+
+  *val = *paddr;
+  return 0;
+}
+
+int
+main ()
+{
+  if (target_is_big_endian())
+    return 77;
+
+  const uint32_t plt_instructions[ip_program_end] =
+    {
+      0xdeadbeef,
+      0xf8410018, // std     r2,24(r1)
+      0xe9828730, // ld      r12,-30928(r2)
+      0x7d8903a6, // mtctr   r12
+      0x4e800420, // bctr
+      0xdeadbeef,
+    };
+  uint32_t test_instructions[ip_program_end];
+  memcpy(test_instructions, plt_instructions, sizeof(test_instructions));
+
+  struct unw_addr_space mock_address_space;
+  mock_address_space.big_endian = 0;
+  mock_address_space.acc.access_mem = &access_mem;
+
+  struct cursor cursor;
+  struct dwarf_cursor *dwarf = &cursor.dwarf;
+  struct unw_cursor *c = (struct unw_cursor *)(&cursor);
+  dwarf->as = &mock_address_space;
+  dwarf->as_arg = &test_instructions;
+
+  /* ip at std r2,24(r1) */
+  dwarf->ip = (unw_word_t) (test_instructions + ip_std);
+  if (!unw_is_plt_entry(c)) return -1;
+
+  /* ld uses a different offset */
+  test_instructions[ip_ld] = 0xe9820000;
+  if (!unw_is_plt_entry(c)) return -1;
+  memcpy(test_instructions, plt_instructions, sizeof(test_instructions));
+
+  /* ip_ld is not a ld instruction */
+  test_instructions[ip_ld] = 0xf154f00d;
+  if (unw_is_plt_entry(c)) return -1;
+  memcpy(test_instructions, plt_instructions, sizeof(test_instructions));
+
+  /* ip_mtctr is not a mtctr instruction */
+  test_instructions[ip_mtctr] = 0xf154f00d;
+  if (unw_is_plt_entry(c)) return -1;
+  memcpy(test_instructions, plt_instructions, sizeof(test_instructions));
+
+  /* ip_bctr is not a bctr instruction */
+  test_instructions[ip_bctr] = 0xf154f00d;
+  if (unw_is_plt_entry(c)) return -1;
+  memcpy(test_instructions, plt_instructions, sizeof(test_instructions));
+
+  /* ip at ld r12,-30928(r2) */
+  dwarf->ip = (unw_word_t) (test_instructions + ip_ld);
+  if (!unw_is_plt_entry(c)) return -1;
+
+  /* ip_std is not a std instruction */
+  test_instructions[ip_std] = 0xf154f00d;
+  if (unw_is_plt_entry(c)) return -1;
+  memcpy(test_instructions, plt_instructions, sizeof(test_instructions));
+
+  /* ip_mtctr is not a mtctr instruction */
+  test_instructions[ip_mtctr] = 0xf154f00d;
+  if (unw_is_plt_entry(c)) return -1;
+  memcpy(test_instructions, plt_instructions, sizeof(test_instructions));
+
+  /* ip_bctr is not a bctr instruction */
+  test_instructions[ip_bctr] = 0xf154f00d;
+  if (unw_is_plt_entry(c)) return -1;
+  memcpy(test_instructions, plt_instructions, sizeof(test_instructions));
+
+  /* ip at mtctr r12 */
+  dwarf->ip = (unw_word_t) (test_instructions + ip_mtctr);
+  if (!unw_is_plt_entry(c)) return -1;
+
+  /* ip_std is not a std instruction */
+  test_instructions[ip_std] = 0xf154f00d;
+  if (unw_is_plt_entry(c)) return -1;
+  memcpy(test_instructions, plt_instructions, sizeof(test_instructions));
+
+  /* ip_ld is not a ld instruction */
+  test_instructions[ip_ld] = 0xf154f00d;
+  if (unw_is_plt_entry(c)) return -1;
+  memcpy(test_instructions, plt_instructions, sizeof(test_instructions));
+
+  /* ip_bctr is not a bctr instruction */
+  test_instructions[ip_bctr] = 0xf154f00d;
+  if (unw_is_plt_entry(c)) return -1;
+  memcpy(test_instructions, plt_instructions, sizeof(test_instructions));
+
+  /* ip at bctr */
+  dwarf->ip = (unw_word_t) (test_instructions + ip_bctr);
+  if (!unw_is_plt_entry(c)) return -1;
+
+  /* ip_std is not a std instruction */
+  test_instructions[ip_std] = 0xf154f00d;
+  if (unw_is_plt_entry(c)) return -1;
+  memcpy(test_instructions, plt_instructions, sizeof(test_instructions));
+
+  /* ip_ld is not a ld instruction */
+  test_instructions[ip_ld] = 0xf154f00d;
+  if (unw_is_plt_entry(c)) return -1;
+  memcpy(test_instructions, plt_instructions, sizeof(test_instructions));
+
+  /* ip_mtctr is not a mtctr instruction */
+  test_instructions[ip_mtctr] = 0xf154f00d;
+  if (unw_is_plt_entry(c)) return -1;
+  memcpy(test_instructions, plt_instructions, sizeof(test_instructions));
+
+  /* ip at non-PLT instruction */
+  dwarf->ip = (unw_word_t) (test_instructions + ip_guard0);
+  if (unw_is_plt_entry(c)) return -1;
+
+  /* ip at another non-PLT instruction */
+  dwarf->ip = (unw_word_t) (test_instructions + ip_guard1);
+  if (unw_is_plt_entry(c)) return -1;
+
+  return 0;
+}