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Diffstat (limited to 'src/third_party/unwind/dist/src/aarch64/Gstep.c')
-rw-r--r--src/third_party/unwind/dist/src/aarch64/Gstep.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/src/third_party/unwind/dist/src/aarch64/Gstep.c b/src/third_party/unwind/dist/src/aarch64/Gstep.c
new file mode 100644
index 00000000000..fdf64a73f33
--- /dev/null
+++ b/src/third_party/unwind/dist/src/aarch64/Gstep.c
@@ -0,0 +1,189 @@
+/* libunwind - a platform-independent unwind library
+ Copyright (C) 2008 CodeSourcery
+ Copyright (C) 2011-2013 Linaro Limited
+ Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com>
+
+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 "unwind_i.h"
+#include "offsets.h"
+
+/* Recognise PLT entries such as:
+ 40ddf0: b0000570 adrp x16, 4ba000 <_GLOBAL_OFFSET_TABLE_+0x2a8>
+ 40ddf4: f9433611 ldr x17, [x16,#1640]
+ 40ddf8: 9119a210 add x16, x16, #0x668
+ 40ddfc: d61f0220 br x17 */
+static int
+is_plt_entry (struct dwarf_cursor *c)
+{
+ unw_word_t w0, w1;
+ unw_accessors_t *a;
+ int ret;
+
+ a = unw_get_accessors_int (c->as);
+ if ((ret = (*a->access_mem) (c->as, c->ip, &w0, 0, c->as_arg)) < 0
+ || (ret = (*a->access_mem) (c->as, c->ip + 8, &w1, 0, c->as_arg)) < 0)
+ return 0;
+
+ ret = (((w0 & 0xff0000009f000000) == 0xf900000090000000)
+ && ((w1 & 0xffffffffff000000) == 0xd61f022091000000));
+
+ Debug (14, "ip=0x%lx => 0x%016lx 0x%016lx, ret = %d\n", c->ip, w0, w1, ret);
+ return ret;
+}
+
+static int
+aarch64_handle_signal_frame (unw_cursor_t *cursor)
+{
+ struct cursor *c = (struct cursor *) cursor;
+ int ret;
+ unw_word_t sc_addr, sp, sp_addr = c->dwarf.cfa;
+ struct dwarf_loc sp_loc = DWARF_LOC (sp_addr, 0);
+
+ if ((ret = dwarf_get (&c->dwarf, sp_loc, &sp)) < 0)
+ return -UNW_EUNSPEC;
+
+ ret = unw_is_signal_frame (cursor);
+ Debug(1, "unw_is_signal_frame()=%d\n", ret);
+
+ /* Save the SP and PC to be able to return execution at this point
+ later in time (unw_resume). */
+ c->sigcontext_sp = c->dwarf.cfa;
+ c->sigcontext_pc = c->dwarf.ip;
+
+ if (ret)
+ {
+ c->sigcontext_format = AARCH64_SCF_LINUX_RT_SIGFRAME;
+ sc_addr = sp_addr + sizeof (siginfo_t) + LINUX_UC_MCONTEXT_OFF;
+ }
+ else
+ return -UNW_EUNSPEC;
+
+ c->sigcontext_addr = sc_addr;
+ c->frame_info.frame_type = UNW_AARCH64_FRAME_SIGRETURN;
+ c->frame_info.cfa_reg_offset = sc_addr - sp_addr;
+
+ /* Update the dwarf cursor.
+ Set the location of the registers to the corresponding addresses of the
+ uc_mcontext / sigcontext structure contents. */
+ c->dwarf.loc[UNW_AARCH64_X0] = DWARF_LOC (sc_addr + LINUX_SC_X0_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X1] = DWARF_LOC (sc_addr + LINUX_SC_X1_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X2] = DWARF_LOC (sc_addr + LINUX_SC_X2_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X3] = DWARF_LOC (sc_addr + LINUX_SC_X3_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X4] = DWARF_LOC (sc_addr + LINUX_SC_X4_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X5] = DWARF_LOC (sc_addr + LINUX_SC_X5_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X6] = DWARF_LOC (sc_addr + LINUX_SC_X6_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X7] = DWARF_LOC (sc_addr + LINUX_SC_X7_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X8] = DWARF_LOC (sc_addr + LINUX_SC_X8_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X9] = DWARF_LOC (sc_addr + LINUX_SC_X9_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X10] = DWARF_LOC (sc_addr + LINUX_SC_X10_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X11] = DWARF_LOC (sc_addr + LINUX_SC_X11_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X12] = DWARF_LOC (sc_addr + LINUX_SC_X12_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X13] = DWARF_LOC (sc_addr + LINUX_SC_X13_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X14] = DWARF_LOC (sc_addr + LINUX_SC_X14_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X15] = DWARF_LOC (sc_addr + LINUX_SC_X15_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X16] = DWARF_LOC (sc_addr + LINUX_SC_X16_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X17] = DWARF_LOC (sc_addr + LINUX_SC_X17_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X18] = DWARF_LOC (sc_addr + LINUX_SC_X18_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X19] = DWARF_LOC (sc_addr + LINUX_SC_X19_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X20] = DWARF_LOC (sc_addr + LINUX_SC_X20_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X21] = DWARF_LOC (sc_addr + LINUX_SC_X21_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X22] = DWARF_LOC (sc_addr + LINUX_SC_X22_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X23] = DWARF_LOC (sc_addr + LINUX_SC_X23_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X24] = DWARF_LOC (sc_addr + LINUX_SC_X24_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X25] = DWARF_LOC (sc_addr + LINUX_SC_X25_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X26] = DWARF_LOC (sc_addr + LINUX_SC_X26_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X27] = DWARF_LOC (sc_addr + LINUX_SC_X27_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X28] = DWARF_LOC (sc_addr + LINUX_SC_X28_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X29] = DWARF_LOC (sc_addr + LINUX_SC_X29_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_X30] = DWARF_LOC (sc_addr + LINUX_SC_X30_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_SP] = DWARF_LOC (sc_addr + LINUX_SC_SP_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_PC] = DWARF_LOC (sc_addr + LINUX_SC_PC_OFF, 0);
+ c->dwarf.loc[UNW_AARCH64_PSTATE] = DWARF_LOC (sc_addr + LINUX_SC_PSTATE_OFF, 0);
+
+ /* Set SP/CFA and PC/IP. */
+ dwarf_get (&c->dwarf, c->dwarf.loc[UNW_AARCH64_SP], &c->dwarf.cfa);
+ dwarf_get (&c->dwarf, c->dwarf.loc[UNW_AARCH64_PC], &c->dwarf.ip);
+
+ c->dwarf.pi_valid = 0;
+ c->dwarf.use_prev_instr = 0;
+
+ return 1;
+}
+
+int
+unw_step (unw_cursor_t *cursor)
+{
+ struct cursor *c = (struct cursor *) cursor;
+ int ret;
+
+ Debug (1, "(cursor=%p, ip=0x%016lx, cfa=0x%016lx))\n",
+ c, c->dwarf.ip, c->dwarf.cfa);
+
+ /* Check if this is a signal frame. */
+ if (unw_is_signal_frame (cursor) > 0)
+ return aarch64_handle_signal_frame (cursor);
+
+ ret = dwarf_step (&c->dwarf);
+ Debug(1, "dwarf_step()=%d\n", ret);
+
+ if (unlikely (ret == -UNW_ESTOPUNWIND))
+ return ret;
+
+ if (unlikely (ret < 0))
+ {
+ /* DWARF failed. */
+ if (is_plt_entry (&c->dwarf))
+ {
+ Debug (2, "found plt entry\n");
+ c->frame_info.frame_type = UNW_AARCH64_FRAME_STANDARD;
+ }
+ else
+ {
+ Debug (2, "fallback\n");
+ c->frame_info.frame_type = UNW_AARCH64_FRAME_GUESSED;
+ }
+ /* Use link register (X30). */
+ c->frame_info.cfa_reg_offset = 0;
+ c->frame_info.cfa_reg_sp = 0;
+ c->frame_info.fp_cfa_offset = -1;
+ c->frame_info.lr_cfa_offset = -1;
+ c->frame_info.sp_cfa_offset = -1;
+ c->dwarf.loc[UNW_AARCH64_PC] = c->dwarf.loc[UNW_AARCH64_X30];
+ c->dwarf.loc[UNW_AARCH64_X30] = DWARF_NULL_LOC;
+ if (!DWARF_IS_NULL_LOC (c->dwarf.loc[UNW_AARCH64_PC]))
+ {
+ ret = dwarf_get (&c->dwarf, c->dwarf.loc[UNW_AARCH64_PC], &c->dwarf.ip);
+ if (ret < 0)
+ {
+ Debug (2, "failed to get pc from link register: %d\n", ret);
+ return ret;
+ }
+ Debug (2, "link register (x30) = 0x%016lx\n", c->dwarf.ip);
+ ret = 1;
+ }
+ else
+ c->dwarf.ip = 0;
+ }
+
+ return (c->dwarf.ip == 0) ? 0 : 1;
+}
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