diff options
Diffstat (limited to 'libgcc/unwind-dw2-execute_cfa.h')
| -rw-r--r-- | libgcc/unwind-dw2-execute_cfa.h | 28 |
1 files changed, 15 insertions, 13 deletions
diff --git a/libgcc/unwind-dw2-execute_cfa.h b/libgcc/unwind-dw2-execute_cfa.h index a6b249f..2ecb86e 100644 --- a/libgcc/unwind-dw2-execute_cfa.h +++ b/libgcc/unwind-dw2-execute_cfa.h @@ -1,5 +1,5 @@ /* DWARF2 exception handling CFA execution engine. - Copyright (C) 1997-2024 Free Software Foundation, Inc. + Copyright (C) 1997-2025 Free Software Foundation, Inc. This file is part of GCC. @@ -271,23 +271,25 @@ fs->regs.how[reg] = REG_SAVED_VAL_EXP; fs->regs.reg[reg].loc.exp = insn_ptr; } + /* Don't execute the expression, but jump over it by adding + DW_FORM_block's size to insn_ptr. */ insn_ptr = read_uleb128 (insn_ptr, &utmp); insn_ptr += utmp; break; - case DW_CFA_GNU_window_save: #if defined (__aarch64__) && !defined (__ILP32__) - /* This CFA is multiplexed with Sparc. On AArch64 it's used to toggle - return address signing status. REG_UNSAVED/REG_UNSAVED_ARCHEXT - mean RA signing is disabled/enabled. */ - reg = DWARF_REGNUM_AARCH64_RA_STATE; - gcc_assert (fs->regs.how[reg] == REG_UNSAVED - || fs->regs.how[reg] == REG_UNSAVED_ARCHEXT); - if (fs->regs.how[reg] == REG_UNSAVED) - fs->regs.how[reg] = REG_UNSAVED_ARCHEXT; - else - fs->regs.how[reg] = REG_UNSAVED; + case DW_CFA_AARCH64_negate_ra_state: + /* This CFA is multiplexed with SPARC. + On AArch64 it's used to toggle the status of return address signing + with SP as a diversifier. + - REG_ARCHEXT means that the RA state register in FS contains a + valid value, and that no other DWARF directive has changed the + value of this register. + - any other value is not compatible with negating the RA state. */ + aarch64_fs_ra_state_toggle (fs); + break; #else + case DW_CFA_GNU_window_save: /* ??? Hardcoded for SPARC register window configuration. */ if (__LIBGCC_DWARF_FRAME_REGISTERS__ >= 32) for (reg = 16; reg < 32; ++reg) @@ -295,8 +297,8 @@ fs->regs.how[reg] = REG_SAVED_OFFSET; fs->regs.reg[reg].loc.offset = (reg - 16) * sizeof (void *); } -#endif break; +#endif case DW_CFA_GNU_args_size: insn_ptr = read_uleb128 (insn_ptr, &utmp); |