From 7e6566495be81f5f0a3bef0224fe128ef44bd075 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Thu, 2 Jul 1998 05:34:36 +0000 Subject: [PATCH] * config/obj-elf.c (obj_elf_vtable_inherit, obj_elf_vtable_entry): New. (elf_pseudo_table): Add them. * config/tc-mips.c (mips_force_relocation): Force vtable relocs. (md_apply_fix): Accept them. (mips_fix_adjustable): Don't adjust them. (tc_gen_reloc): Mung BFD_RELOC_VTABLE_ENTRY for Rel. * config/tc-ppc.c (md_apply_fix3): Accept vtable relocs. * config/tc-ppc.h (TC_FORCE_RELOCATION_SECTION): Force vtable relocs. (tc_fix_adjustable): Don't adjust them. --- gas/ChangeLog | 12 ++++ gas/config/tc-mips.c | 146 ++++++++++++++++++++++++++++++++++++++++--- 2 files changed, 151 insertions(+), 7 deletions(-) diff --git a/gas/ChangeLog b/gas/ChangeLog index b99f2c3590f..77914b8e2d2 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,3 +1,15 @@ +Wed Jul 1 20:06:20 1998 Richard Henderson + + * config/obj-elf.c (obj_elf_vtable_inherit, obj_elf_vtable_entry): New. + (elf_pseudo_table): Add them. + * config/tc-mips.c (mips_force_relocation): Force vtable relocs. + (md_apply_fix): Accept them. + (mips_fix_adjustable): Don't adjust them. + (tc_gen_reloc): Mung BFD_RELOC_VTABLE_ENTRY for Rel. + * config/tc-ppc.c (md_apply_fix3): Accept vtable relocs. + * config/tc-ppc.h (TC_FORCE_RELOCATION_SECTION): Force vtable relocs. + (tc_fix_adjustable): Don't adjust them. + Wed Jul 1 16:35:32 1998 Doug Evans * Makefile.am (CGEN_CPU_PREFIX): New variable. diff --git a/gas/config/tc-mips.c b/gas/config/tc-mips.c index 5b975093b88..fe5fdb30f3d 100644 --- a/gas/config/tc-mips.c +++ b/gas/config/tc-mips.c @@ -439,6 +439,11 @@ static int prev_insn_extended; noreorder. */ static int prev_prev_insn_unreordered; +/* start-sanitize-branchbug4011 */ +/* Non-zero if the previous insn had one or more labels */ +static int prev_insn_labels; + +/* end-sanitize-branchbug4011 */ /* If this is set, it points to a frag holding nop instructions which were inserted before the start of a noreorder section. If those nops turn out to be unnecessary, the size of the frag can be @@ -614,6 +619,15 @@ static const int mips16_to_32_reg_map[] = #define RELAX_MIPS16_LONG_BRANCH(i) (((i) & 0x2000) != 0) #define RELAX_MIPS16_MARK_LONG_BRANCH(i) ((i) | 0x2000) #define RELAX_MIPS16_CLEAR_LONG_BRANCH(i) ((i) &~ 0x2000) +/* start-sanitize-branchbug4011 */ +/* The 4011 core has a bug in it's branch processing that + an be avoided if branches never branches (where branches + are defined as those starting with 'b'). We do this here + by insuring that labels are not directly on branch instructions, + and if they are inserting a no-op between the label and the + branch. */ +static int mips_fix_4011_branch_bug = 0; +/* end-sanitize-branchbug4011 */ /* Prototypes for static functions. */ @@ -1462,6 +1476,10 @@ append_insn (place, ip, address_expr, reloc_type, unmatched_hi) char *f; fixS *fixp; int nops = 0; + /* start-sanitize-branchbug4011 */ + int label_nop = 0; /* True if a no-op needs to appear between + the current insn and the current labels */ + /* end-sanitize-branchbug4011 */ /* Mark instruction labels in mips16 mode. */ if (mips_opts.mips16) @@ -1662,6 +1680,25 @@ append_insn (place, ip, address_expr, reloc_type, unmatched_hi) && ip->insn_opcode == (mips_opts.mips16 ? 0x6500 : 0)) --nops; + /* start-sanitize-branchbug4011 */ + /* If we have a label on a branch insn, we need at least one no-op + between the label and the branch. The pinfo flags in this test + must cover all the kinds of branches. */ + if (mips_fix_4011_branch_bug + && insn_labels != NULL + && (ip->insn_mo->pinfo + & (INSN_UNCOND_BRANCH_DELAY + |INSN_COND_BRANCH_DELAY + |INSN_COND_BRANCH_LIKELY))) + { + label_nop = 1; + + /* Make sure we've got at least one nop. */ + if (nops == 0) + nops = 1; + } + + /* end-sanitize-branchbug4011 */ /* Now emit the right number of NOP instructions. */ if (nops > 0 && ! mips_opts.noreorder) { @@ -1673,6 +1710,12 @@ append_insn (place, ip, address_expr, reloc_type, unmatched_hi) old_frag = frag_now; old_frag_offset = frag_now_fix (); + /* start-sanitize-branchbug4011 */ + /* Emit the nops that should be before the label. */ + if (label_nop) + nops -= 1; + + /* end-sanitize-branchbug4011 */ for (i = 0; i < nops; i++) emit_nop (); @@ -1704,6 +1747,15 @@ append_insn (place, ip, address_expr, reloc_type, unmatched_hi) if (ECOFF_DEBUGGING) ecoff_fix_loc (old_frag, old_frag_offset); #endif + /* start-sanitize-branchbug4011 */ + if (label_nop) + { + /* Emit the nop after the label, and return the + nop count to it's proper value. */ + emit_nop (); + nops += 1; + } + /* end-sanitize-branchbug4011 */ } else if (prev_nop_frag != NULL) { @@ -1947,6 +1999,10 @@ append_insn (place, ip, address_expr, reloc_type, unmatched_hi) /* If the previous insn is already in a branch delay slot, then we can not swap. */ || prev_insn_is_delay_slot + /* start-sanitize-branchbug4011 */ + /* We can't swap the branch back to a previous label */ + || (mips_fix_4011_branch_bug && prev_insn_labels) + /* end-sanitize-branchbug4011 */ /* If the previous previous insn was in a .set noreorder, we can't swap. Actually, the MIPS assembler will swap in this situation. However, gcc @@ -2254,6 +2310,9 @@ append_insn (place, ip, address_expr, reloc_type, unmatched_hi) prev_insn_frag = frag_now; prev_insn_where = f - frag_now->fr_literal; prev_insn_valid = 1; + /* start-sanitize-branchbug4011 */ + prev_insn_labels = !! insn_labels; + /* end-sanitize-branchbug4011 */ } else if (place == NULL) { @@ -2265,6 +2324,9 @@ append_insn (place, ip, address_expr, reloc_type, unmatched_hi) prev_insn_reloc_type = reloc_type; prev_prev_insn_unreordered = prev_insn_unreordered; prev_insn_unreordered = 1; + /* start-sanitize-branchbug4011 */ + prev_insn_labels = !! insn_labels; + /* end-sanitize-branchbug4011 */ } /* We just output an insn, so the next one doesn't have a label. */ @@ -2302,6 +2364,9 @@ mips_no_prev_insn (preserve) prev_insn_is_delay_slot = 0; prev_insn_unreordered = 0; prev_insn_extended = 0; + /* start-sanitize-branchbug4011 */ + prev_insn_labels = 0; + /* end-sanitize-branchbug4011 */ prev_insn_reloc_type = BFD_RELOC_UNUSED; prev_prev_insn_unreordered = 0; mips_clear_insn_labels (); @@ -7323,7 +7388,9 @@ mips_ip (str, ip) continue; case '9': /* vi27 for vcallmsr */ - if (strncmp (s, "vi27", 4) == 0) + if (strncmp (s, "$vi27", 5) == 0) + s += 5; + else if (strncmp (s, "vi27", 4) == 0) s += 4; else as_bad (_("expected vi27")); @@ -7566,6 +7633,17 @@ mips_ip (str, ip) s_reset = s; if (s[0] == '$') { + /* start-sanitize-r5900 */ + /* Allow "$viNN" as coprocessor register name */ + if (mips_5900 + && *args == 'G' + && s[1] == 'v' + && s[2] == 'i') + { + s += 2; + } + /* end-sanitize-r5900 */ + if (isdigit (s[1])) { ++s; @@ -7796,11 +7874,20 @@ mips_ip (str, ip) } /* start-sanitize-r5900 */ - /* Handle vf and vi regsiters for vu0. */ - if (s[0] == 'v' - && (s[1] == 'f' || s[1] == 'i') - && isdigit (s[2])) - { + /* Handle vf and vi regsiters for vu0. Handle optional + `$' prefix. */ + + if ((s[0] == 'v' + && (s[1] == 'f' || s[1] == 'i') + && isdigit (s[2])) + || + (s[0] == '$' + && s[1] == 'v' + && (s[2] == 'f' || s[2] == 'i') + && isdigit (s[3]))) + { + if(s[0] == '$') + ++s; s += 2; regno = 0; do @@ -9292,6 +9379,12 @@ struct option md_longopts[] = { {"no-m4320", no_argument, NULL, OPTION_NO_M4320}, /* end-sanitize-vr4320 */ + /* start-sanitize-branchbug4011 */ +#define OPTION_FIX_4011_BRANCH_BUG (OPTION_MD_BASE + 34) + {"fix-4011-branch-bug", no_argument, NULL, OPTION_FIX_4011_BRANCH_BUG}, +#define OPTION_NO_FIX_4011_BRANCH_BUG (OPTION_MD_BASE + 35) + {"no-fix-4011-branch-bug", no_argument, NULL, OPTION_NO_FIX_4011_BRANCH_BUG}, + /* end-sanitize-branchbug4011 */ #define OPTION_CALL_SHARED (OPTION_MD_BASE + 7) #define OPTION_NON_SHARED (OPTION_MD_BASE + 8) #define OPTION_XGOT (OPTION_MD_BASE + 19) @@ -9672,6 +9765,16 @@ md_parse_option (c, arg) } break; + /* start-sanitize-branchbug4011 */ + case OPTION_FIX_4011_BRANCH_BUG: + mips_fix_4011_branch_bug = 1; + break; + + case OPTION_NO_FIX_4011_BRANCH_BUG: + mips_fix_4011_branch_bug = 0; + break; + + /* end-sanitize-branchbug4011 */ default: return 0; } @@ -9897,6 +10000,10 @@ int mips_force_relocation (fixp) fixS *fixp; { + if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT + || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY) + return 1; + return (mips_pic == EMBEDDED_PIC && (fixp->fx_pcrel || SWITCH_TABLE (fixp) @@ -9916,7 +10023,9 @@ md_apply_fix (fixP, valueP) assert (fixP->fx_size == 4 || fixP->fx_r_type == BFD_RELOC_16 - || fixP->fx_r_type == BFD_RELOC_64); + || fixP->fx_r_type == BFD_RELOC_64 + || fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT + || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY); value = *valueP; @@ -10131,6 +10240,18 @@ md_apply_fix (fixP, valueP) md_number_to_chars ((char *) buf, (valueT) insn, 4); break; + case BFD_RELOC_VTABLE_INHERIT: + fixP->fx_done = 0; + if (fixP->fx_addsy + && !S_IS_DEFINED (fixP->fx_addsy) + && !S_IS_WEAK (fixP->fx_addsy)) + S_SET_WEAK (fixP->fx_addsy); + break; + + case BFD_RELOC_VTABLE_ENTRY: + fixP->fx_done = 0; + break; + default: internalError (); } @@ -11375,6 +11496,9 @@ mips_fix_adjustable (fixp) { if (fixp->fx_r_type == BFD_RELOC_MIPS16_JMP) return 0; + if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT + || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY) + return 0; if (fixp->fx_addsy == NULL) return 1; #ifdef OBJ_ELF @@ -11531,6 +11655,14 @@ tc_gen_reloc (section, fixp) abort (); } + /* Since MIPS ELF uses Rel instead of Rela, encode the vtable entry + to be used in the relocation's section offset. */ + if (fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY) + { + reloc->address = reloc->addend; + reloc->addend = 0; + } + /* Since DIFF_EXPR_OK is defined in tc-mips.h, it is possible that fixup_segment converted a non-PC relative reloc into a PC relative reloc. In such a case, we need to convert the reloc -- 2.30.2