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133 lines
4.1 KiB
Diff
133 lines
4.1 KiB
Diff
As-applied. From:
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https://gcc.gnu.org/ml/gcc-patches/2014-09/msg02625.html
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Linked from bug62231 comment 4 there
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---
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gcc/defaults.h | 5 +++
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gcc/dwarf2cfi.c | 76 +++++++++++++++++++++++++++++++++++-----------------
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libgcc/unwind-dw2.c | 4 --
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3 files changed, 57 insertions(+), 28 deletions(-)
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--- a/gcc/defaults.h
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+++ b/gcc/defaults.h
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@@ -438,6 +438,11 @@
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#define DWARF_FRAME_REGNUM(REG) DBX_REGISTER_NUMBER (REG)
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#endif
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+/* The mapping from dwarf CFA reg number to internal dwarf reg numbers. */
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+#ifndef DWARF_REG_TO_UNWIND_COLUMN
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+#define DWARF_REG_TO_UNWIND_COLUMN(REGNO) (REGNO)
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+#endif
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+
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/* Map register numbers held in the call frame info that gcc has
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collected using DWARF_FRAME_REGNUM to those that should be output in
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.debug_frame and .eh_frame. */
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--- a/gcc/dwarf2cfi.c
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+++ b/gcc/dwarf2cfi.c
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@@ -225,7 +225,44 @@
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emit_move_insn (adjust_address (mem, mode, offset), GEN_INT (size));
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}
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-/* Generate code to initialize the register size table. */
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+/* Helper for expand_builtin_init_dwarf_reg_sizes. Generate code to
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+ initialize the dwarf register size table entry corresponding to register
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+ REGNO in REGMODE. TABLE is the table base address, SLOTMODE is the mode
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+ to use for the size entry to initialize, and WROTE_RETURN_COLUMN needs to
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+ be set to true if the dwarf register number for REGNO is the dwarf return
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+ column number. */
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+
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+static
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+void init_one_dwarf_reg_size (int regno, enum machine_mode regmode,
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+ rtx table, enum machine_mode slotmode,
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+ bool *wrote_return_column)
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+{
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+ const unsigned int dnum = DWARF_FRAME_REGNUM (regno);
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+ const unsigned int rnum = DWARF2_FRAME_REG_OUT (dnum, 1);
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+ const unsigned int dcol = DWARF_REG_TO_UNWIND_COLUMN (rnum);
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+
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+ const HOST_WIDE_INT slotoffset = dcol * GET_MODE_SIZE (slotmode);
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+ const HOST_WIDE_INT regsize = GET_MODE_SIZE (regmode);
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+
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+ if (rnum >= DWARF_FRAME_REGISTERS)
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+ return;
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+
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+ if (dnum == DWARF_FRAME_RETURN_COLUMN)
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+ {
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+ if (regmode == VOIDmode)
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+ return;
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+ *wrote_return_column = true;
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+ }
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+
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+ if (slotoffset < 0)
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+ return;
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+
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+ emit_move_insn (adjust_address (table, slotmode, slotoffset),
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+ gen_int_mode (regsize, slotmode));
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+}
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+
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+/* Generate code to initialize the dwarf register size table located
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+ at the provided ADDRESS. */
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void
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expand_builtin_init_dwarf_reg_sizes (tree address)
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@@ -238,30 +275,21 @@
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for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
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{
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- unsigned int dnum = DWARF_FRAME_REGNUM (i);
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- unsigned int rnum = DWARF2_FRAME_REG_OUT (dnum, 1);
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+ enum machine_mode save_mode = reg_raw_mode[i];
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+ rtx span;
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- if (rnum < DWARF_FRAME_REGISTERS)
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- {
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- HOST_WIDE_INT offset = rnum * GET_MODE_SIZE (mode);
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- enum machine_mode save_mode = reg_raw_mode[i];
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- HOST_WIDE_INT size;
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-
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- if (HARD_REGNO_CALL_PART_CLOBBERED (i, save_mode))
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- save_mode = choose_hard_reg_mode (i, 1, true);
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- if (dnum == DWARF_FRAME_RETURN_COLUMN)
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- {
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- if (save_mode == VOIDmode)
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- continue;
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- wrote_return_column = true;
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- }
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- size = GET_MODE_SIZE (save_mode);
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- if (offset < 0)
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- continue;
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-
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- emit_move_insn (adjust_address (mem, mode, offset),
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- gen_int_mode (size, mode));
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- }
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+ span = targetm.dwarf_register_span (gen_rtx_REG (save_mode, i));
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+ if (!span)
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+ init_one_dwarf_reg_size (i, save_mode, mem, mode, &wrote_return_column);
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+ else
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+ {
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+ for (int si = 0; si < XVECLEN (span, 0); si++)
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+ {
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+ rtx reg = XVECEXP (span, 0, si);
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+ init_one_dwarf_reg_size
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+ (REGNO (reg), GET_MODE (reg), mem, mode, &wrote_return_column);
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+ }
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+ }
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}
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if (!wrote_return_column)
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--- a/libgcc/unwind-dw2.c
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+++ b/libgcc/unwind-dw2.c
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@@ -55,10 +55,6 @@
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#define PRE_GCC3_DWARF_FRAME_REGISTERS DWARF_FRAME_REGISTERS
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#endif
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-#ifndef DWARF_REG_TO_UNWIND_COLUMN
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-#define DWARF_REG_TO_UNWIND_COLUMN(REGNO) (REGNO)
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-#endif
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-
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/* ??? For the public function interfaces, we tend to gcc_assert that the
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column numbers are in range. For the dwarf2 unwind info this does happen,
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although so far in a case that doesn't actually matter.
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