* config/tc-mips.c (mips_in_shared): New static variable.
(macro_build_lui): Permit "_gp" if !mips_in_shared. (md_longopts): Add -mshared and -mno-shared. (md_parse_option): Handle OPTION_MSHARED and OPTION_MNO_SHARED. (s_cpload): Implement !mips_in_shared case. (s_cpsetup): Likewise. * doc/c-mips.texi (MIPS Opts): Document -mno-shared. * NEWS: Mention -mno-shared.
This commit is contained in:
Ian Lance Taylor
parent
01926a6935
commit
aa6975fbb3
@ -1,3 +1,14 @@
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2004-12-10 Ian Lance Taylor <ian@wasabisystems.com>
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* config/tc-mips.c (mips_in_shared): New static variable.
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(macro_build_lui): Permit "_gp" if !mips_in_shared.
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(md_longopts): Add -mshared and -mno-shared.
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(md_parse_option): Handle OPTION_MSHARED and OPTION_MNO_SHARED.
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(s_cpload): Implement !mips_in_shared case.
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(s_cpsetup): Likewise.
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* doc/c-mips.texi (MIPS Opts): Document -mno-shared.
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* NEWS: Mention -mno-shared.
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2004-12-09 Paul Brook <paul@codesourcery.com>
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* config/tc-arm.c (s_arm_unwind_fnend): Use R_ARM_PREL31 relocation
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2
gas/NEWS
2
gas/NEWS
@ -19,6 +19,8 @@
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* Support for ColdFire EMAC instructions added and Motorola syntax for MAC/EMAC
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instrucitons.
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* New command line option -mno-shared for MIPS ELF targets.
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* New command line option --alternate and pseudo-ops .altmacro and .noaltmacro
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added to enter (and leave) alternate macro syntax mode.
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@ -136,6 +136,10 @@ static enum mips_abi_level mips_abi = NO_ABI;
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/* Whether or not we have code that can call pic code. */
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int mips_abicalls = FALSE;
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/* Whether or not we have code which can be put into a shared
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library. */
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static bfd_boolean mips_in_shared = TRUE;
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/* This is the set of options which may be modified by the .set
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pseudo-op. We use a struct so that .set push and .set pop are more
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reliable. */
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@ -3388,10 +3392,13 @@ macro_build_lui (expressionS *ep, int regnum)
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else
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{
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assert (ep->X_op == O_symbol);
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/* _gp_disp is a special case, used from s_cpload. */
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/* _gp_disp is a special case, used from s_cpload. _gp is used
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if mips_no_shared. */
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assert (mips_pic == NO_PIC
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|| (! HAVE_NEWABI
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&& strcmp (S_GET_NAME (ep->X_add_symbol), "_gp_disp") == 0));
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&& strcmp (S_GET_NAME (ep->X_add_symbol), "_gp_disp") == 0)
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|| (! mips_in_shared
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&& strcmp (S_GET_NAME (ep->X_add_symbol), "_gp") == 0));
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*r = BFD_RELOC_HI16_S;
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}
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@ -10120,10 +10127,14 @@ struct option md_longopts[] =
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#define OPTION_NO_RELAX_BRANCH (OPTION_MISC_BASE + 11)
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{"relax-branch", no_argument, NULL, OPTION_RELAX_BRANCH},
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{"no-relax-branch", no_argument, NULL, OPTION_NO_RELAX_BRANCH},
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#define OPTION_MSHARED (OPTION_MISC_BASE + 12)
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#define OPTION_MNO_SHARED (OPTION_MISC_BASE + 13)
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{"mshared", no_argument, NULL, OPTION_MSHARED},
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{"mno-shared", no_argument, NULL, OPTION_MNO_SHARED},
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/* ELF-specific options. */
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#ifdef OBJ_ELF
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#define OPTION_ELF_BASE (OPTION_MISC_BASE + 12)
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#define OPTION_ELF_BASE (OPTION_MISC_BASE + 14)
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#define OPTION_CALL_SHARED (OPTION_ELF_BASE + 0)
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{"KPIC", no_argument, NULL, OPTION_CALL_SHARED},
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{"call_shared", no_argument, NULL, OPTION_CALL_SHARED},
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@ -10336,6 +10347,14 @@ md_parse_option (int c, char *arg)
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mips_relax_branch = 0;
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break;
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case OPTION_MSHARED:
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mips_in_shared = TRUE;
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break;
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case OPTION_MNO_SHARED:
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mips_in_shared = FALSE;
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break;
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#ifdef OBJ_ELF
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/* When generating ELF code, we permit -KPIC and -call_shared to
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select SVR4_PIC, and -non_shared to select no PIC. This is
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@ -11794,12 +11813,22 @@ s_abicalls (int ignore ATTRIBUTE_UNUSED)
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lui $gp,%hi(_gp_disp)
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addiu $gp,$gp,%lo(_gp_disp)
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addu $gp,$gp,.cpload argument
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The .cpload argument is normally $25 == $t9. */
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The .cpload argument is normally $25 == $t9.
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The -mno-shared option changes this to:
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lui $gp,%hi(_gp)
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addiu $gp,$gp,%lo(_gp)
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and the argument is ignored. This saves an instruction, but the
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resulting code is not position independent; it uses an absolute
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address for _gp. Thus code assembled with -mno-shared can go into
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an ordinary executable, but not into a shared library. */
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static void
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s_cpload (int ignore ATTRIBUTE_UNUSED)
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{
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expressionS ex;
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int reg;
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int in_shared;
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/* If we are not generating SVR4 PIC code, or if this is NewABI code,
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.cpload is ignored. */
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@ -11813,8 +11842,14 @@ s_cpload (int ignore ATTRIBUTE_UNUSED)
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if (mips_opts.noreorder == 0)
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as_warn (_(".cpload not in noreorder section"));
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reg = tc_get_register (0);
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/* If we need to produce a 64-bit address, we are better off using
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the default instruction sequence. */
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in_shared = mips_in_shared || HAVE_64BIT_ADDRESSES;
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ex.X_op = O_symbol;
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ex.X_add_symbol = symbol_find_or_make ("_gp_disp");
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ex.X_add_symbol = symbol_find_or_make (in_shared ? "_gp_disp" : "_gp");
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ex.X_op_symbol = NULL;
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ex.X_add_number = 0;
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@ -11825,8 +11860,9 @@ s_cpload (int ignore ATTRIBUTE_UNUSED)
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macro_build_lui (&ex, mips_gp_register);
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macro_build (&ex, "addiu", "t,r,j", mips_gp_register,
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mips_gp_register, BFD_RELOC_LO16);
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macro_build (NULL, "addu", "d,v,t", mips_gp_register,
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mips_gp_register, tc_get_register (0));
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if (in_shared)
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macro_build (NULL, "addu", "d,v,t", mips_gp_register,
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mips_gp_register, reg);
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macro_end ();
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demand_empty_rest_of_line ();
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@ -11846,7 +11882,13 @@ s_cpload (int ignore ATTRIBUTE_UNUSED)
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lui $gp, %hi(%neg(%gp_rel(label)))
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addiu $gp, $gp, %lo(%neg(%gp_rel(label)))
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daddu $gp, $gp, $reg1
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$reg1 is normally $25 == $t9. */
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$reg1 is normally $25 == $t9.
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The -mno-shared option replaces the last three instructions with
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lui $gp,%hi(_gp)
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addiu $gp,$gp,%lo(_gp)
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*/
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static void
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s_cpsetup (int ignore ATTRIBUTE_UNUSED)
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{
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@ -11908,15 +11950,36 @@ s_cpsetup (int ignore ATTRIBUTE_UNUSED)
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macro_build (NULL, "daddu", "d,v,t", mips_cpreturn_register,
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mips_gp_register, 0);
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macro_build (&ex_sym, "lui", "t,u", mips_gp_register,
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-1, BFD_RELOC_GPREL16, BFD_RELOC_MIPS_SUB, BFD_RELOC_HI16_S);
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if (mips_in_shared || HAVE_64BIT_ADDRESSES)
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{
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macro_build (&ex_sym, "lui", "t,u", mips_gp_register,
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-1, BFD_RELOC_GPREL16, BFD_RELOC_MIPS_SUB,
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BFD_RELOC_HI16_S);
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macro_build (&ex_sym, "addiu", "t,r,j", mips_gp_register,
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mips_gp_register, -1, BFD_RELOC_GPREL16,
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BFD_RELOC_MIPS_SUB, BFD_RELOC_LO16);
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macro_build (&ex_sym, "addiu", "t,r,j", mips_gp_register,
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mips_gp_register, -1, BFD_RELOC_GPREL16,
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BFD_RELOC_MIPS_SUB, BFD_RELOC_LO16);
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macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", mips_gp_register,
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mips_gp_register, reg1);
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}
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else
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{
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expressionS ex;
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ex.X_op = O_symbol;
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ex.X_add_symbol = symbol_find_or_make ("_gp");
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ex.X_op_symbol = NULL;
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ex.X_add_number = 0;
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/* In ELF, this symbol is implicitly an STT_OBJECT symbol. */
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symbol_get_bfdsym (ex.X_add_symbol)->flags |= BSF_OBJECT;
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macro_build_lui (&ex, mips_gp_register);
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macro_build (&ex, "addiu", "t,r,j", mips_gp_register,
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mips_gp_register, BFD_RELOC_LO16);
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}
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macro_build (NULL, ADDRESS_ADD_INSN, "d,v,t", mips_gp_register,
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mips_gp_register, reg1);
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macro_end ();
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demand_empty_rest_of_line ();
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@ -238,6 +238,16 @@ error is detected. This is the default.
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@itemx -mno-pdr
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Control generation of @code{.pdr} sections. Off by default on IRIX, on
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elsewhere.
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@item -mshared
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@itemx -mno-shared
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When generating code using the Unix calling conventions (selected by
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@samp{-KPIC} or @samp{-mcall_shared}), gas will normally generate code
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which can go into a shared library. The @samp{-mno-shared} option
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tells gas to generate code which uses the calling convention, but can
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not go into a shared library. The resulting code is slightly more
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efficient. This option only affects the handling of the
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@samp{.cpload} and @samp{.cpsetup} pseudo-ops.
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@end table
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@node MIPS Object
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