Add support for x32

X32 is a 32-bit psABI for x86-64 with 32-bit pointer size.  More info
can be found at:

https://sites.google.com/site/x32abi/

diff --git a/Mkfiles/Makefile.dj b/Mkfiles/Makefile.dj
index 8881b5446792ac5ffaeb90ddab0af19065c7775b..34773036bb932104228c55a8377c2a7795edbfa3 100644 (file)
--- a/Mkfiles/Makefile.dj
+++ b/Mkfiles/Makefile.dj
@@ -97,7 +97,7 @@ MODULES_OBJFMTS_OBJS= \
 YASM_MODULES+=objfmt_dbg
 YASM_MODULES+=objfmt_bin objfmt_dosexe
 YASM_MODULES+=objfmt_coff objfmt_win32 objfmt_win64 objfmt_x64
-YASM_MODULES+=objfmt_elf objfmt_elf32 objfmt_elf64
+YASM_MODULES+=objfmt_elf objfmt_elf32 objfmt_elf64 objfmt_elfx32
 YASM_MODULES+=objfmt_macho objfmt_macho32 objfmt_macho64
 YASM_MODULES+=objfmt_rdf
 YASM_MODULES+=objfmt_xdf

diff --git a/Mkfiles/Makefile.flat b/Mkfiles/Makefile.flat
index 011fbe5161e39a75cf2c21429deab9be3350dd83..e4d5b219d6dc1f0205598f314d4825635679075a 100644 (file)
--- a/Mkfiles/Makefile.flat
+++ b/Mkfiles/Makefile.flat
@@ -100,7 +100,7 @@ MODULES_OBJFMTS_OBJS= \
 YASM_MODULES+=objfmt_dbg
 YASM_MODULES+=objfmt_bin objfmt_dosexe
 YASM_MODULES+=objfmt_coff objfmt_win32 objfmt_win64 objfmt_x64
-YASM_MODULES+=objfmt_elf objfmt_elf32 objfmt_elf64
+YASM_MODULES+=objfmt_elf objfmt_elf32 objfmt_elf64 objfmt_elfx32
 YASM_MODULES+=objfmt_macho objfmt_macho32 objfmt_macho64
 YASM_MODULES+=objfmt_rdf
 YASM_MODULES+=objfmt_xdf

diff --git a/frontends/yasm/yasm.c b/frontends/yasm/yasm.c
index ddd044bbf886cc23edcea377ee4aae1424e1b2fc..f070a168c88fad252b1e147523c4dd681d4aed0e 100644 (file)
--- a/frontends/yasm/yasm.c
+++ b/frontends/yasm/yasm.c
@@ -355,6 +355,7 @@ do_assemble(void)
     yasm_linemap *linemap;
     yasm_errwarns *errwarns = yasm_errwarns_create();
     int i, matched;
+    const char *machine;
 
     /* Initialize line map */
     linemap = yasm_linemap_create();
@@ -391,7 +392,16 @@ do_assemble(void)
                 yasm__xstrdup(cur_arch_module->default_machine_keyword);
     }
 
-    cur_arch = yasm_arch_create(cur_arch_module, machine_name,
+    /* If we're using amd64 and the default objfmt is elfx32, change the
+     * machine to "x32".
+     */
+    if (strcmp(machine_name, "amd64") == 0 &&
+       strcmp(cur_objfmt_module->keyword, "elfx32") == 0)
+      machine = "x32";
+    else
+      machine = machine_name;
+
+    cur_arch = yasm_arch_create(cur_arch_module, machine,
                                 cur_parser_module->keyword, &arch_error);
     if (!cur_arch) {
         switch (arch_error) {

diff --git a/modules/arch/x86/x86arch.c b/modules/arch/x86/x86arch.c
index 833e94cd07f1b8a0db7b10ac257aa6b6ea485d0f..bac11774ea403a12797d9cf1ac7c407828287749 100644 (file)
--- a/modules/arch/x86/x86arch.c
+++ b/modules/arch/x86/x86arch.c
@@ -39,14 +39,20 @@ x86_create(const char *machine, const char *parser,
            /*@out@*/ yasm_arch_create_error *error)
 {
     yasm_arch_x86 *arch_x86;
-    unsigned int amd64_machine;
+    unsigned int amd64_machine, address_size;
 
     *error = YASM_ARCH_CREATE_OK;
 
-    if (yasm__strcasecmp(machine, "x86") == 0)
+    if (yasm__strcasecmp(machine, "x86") == 0) {
         amd64_machine = 0;
-    else if (yasm__strcasecmp(machine, "amd64") == 0)
+       address_size = 32;
+    } else if (yasm__strcasecmp(machine, "amd64") == 0) {
         amd64_machine = 1;
+       address_size = 64;
+    } else if (yasm__strcasecmp(machine, "x32") == 0) {
+        amd64_machine = 1;
+       address_size = 32;
+    }
     else {
         *error = YASM_ARCH_CREATE_BAD_MACHINE;
         return NULL;
@@ -65,6 +71,7 @@ x86_create(const char *machine, const char *parser,
 
     arch_x86->amd64_machine = amd64_machine;
     arch_x86->mode_bits = 0;
+    arch_x86->address_size = address_size;
     arch_x86->force_strict = 0;
     arch_x86->default_rel = 0;
     arch_x86->gas_intel_mode = 0;
@@ -101,9 +108,12 @@ static const char *
 x86_get_machine(const yasm_arch *arch)
 {
     const yasm_arch_x86 *arch_x86 = (const yasm_arch_x86 *)arch;
-    if (arch_x86->amd64_machine)
-        return "amd64";
-    else
+    if (arch_x86->amd64_machine) {
+        if (arch_x86->address_size == 32)
+            return "x32";
+        else
+            return "amd64";
+    } else
         return "x86";
 }
 
@@ -113,10 +123,7 @@ x86_get_address_size(const yasm_arch *arch)
     const yasm_arch_x86 *arch_x86 = (const yasm_arch_x86 *)arch;
     if (arch_x86->mode_bits != 0)
         return arch_x86->mode_bits;
-    if (arch_x86->amd64_machine)
-        return 64;
-    else
-        return 32;
+    return arch_x86->address_size;
 }
 
 static int
@@ -583,6 +590,7 @@ x86_segreg_print(yasm_arch *arch, uintptr_t segreg, FILE *f)
 static const yasm_arch_machine x86_machines[] = {
     { "IA-32 and derivatives", "x86" },
     { "AMD64", "amd64" },
+    { "X32", "x32" },
     { NULL, NULL }
 };
 

diff --git a/modules/arch/x86/x86arch.h b/modules/arch/x86/x86arch.h
index 5c3a6cf5c9bc2ef5ef7b980e555fbc7d6a25cecc..14b2b2e363f2d015c5704567c6f3c07c9c3dad78 100644 (file)
--- a/modules/arch/x86/x86arch.h
+++ b/modules/arch/x86/x86arch.h
@@ -105,6 +105,7 @@ typedef struct yasm_arch_x86 {
     unsigned int amd64_machine;
     enum x86_parser_type parser;
     unsigned int mode_bits;
+    unsigned int address_size;
     unsigned int force_strict;
     unsigned int default_rel;
     unsigned int gas_intel_mode;

diff --git a/modules/arch/yasm_arch.xml b/modules/arch/yasm_arch.xml
index a5e53ef670f83700ad2ca3bfb82b2b0fce9294df..a35510c096fbcebc6a55d7433436f5168cdabf45 100644 (file)
--- a/modules/arch/yasm_arch.xml
+++ b/modules/arch/yasm_arch.xml
@@ -132,7 +132,9 @@
     assembled will be run in 64-bit mode.  To specify an AMD64 object
     file, use <option>-m amd64</option> on the Yasm command line, or
     explicitly target a 64-bit object format such as <option>-f
-     win64</option> or <option>-f elf64</option>.</para>
+     win64</option> or <option>-f elf64</option>.  <option>-f
+     elfx32</option> can be used to select 32-bit ELF object format
+     for AMD64 processors.</para>
 
    <refsect3>
     <title>Register Changes</title>

diff --git a/modules/objfmts/elf/CMakeLists.txt b/modules/objfmts/elf/CMakeLists.txt
index c06b81d816472342f35e5b0badede6cf277edd08..444e9a8b16839f4476c2c4da10d11c6e6145d6c3 100644 (file)
--- a/modules/objfmts/elf/CMakeLists.txt
+++ b/modules/objfmts/elf/CMakeLists.txt
@@ -3,6 +3,8 @@ YASM_ADD_MODULE(objfmt_elf
     objfmts/elf/elf-objfmt.c
     objfmts/elf/elf-x86-x86.c
     objfmts/elf/elf-x86-amd64.c
+    objfmts/elf/elf-x86-x32.c
     )
 list(APPEND YASM_MODULES objfmt_elf32)
 list(APPEND YASM_MODULES objfmt_elf64)
+list(APPEND YASM_MODULES objfmt_elfx32)

diff --git a/modules/objfmts/elf/Makefile.inc b/modules/objfmts/elf/Makefile.inc
index 659f867ecda5a777b2a5fc62efcfd109dd65bbf6..546576578418dc9d91a6d017e47c4ef5fe0bb0b9 100644 (file)
--- a/modules/objfmts/elf/Makefile.inc
+++ b/modules/objfmts/elf/Makefile.inc
@@ -4,8 +4,9 @@ libyasm_a_SOURCES += modules/objfmts/elf/elf-objfmt.c
 libyasm_a_SOURCES += modules/objfmts/elf/elf-machine.h
 libyasm_a_SOURCES += modules/objfmts/elf/elf-x86-x86.c
 libyasm_a_SOURCES += modules/objfmts/elf/elf-x86-amd64.c
+libyasm_a_SOURCES += modules/objfmts/elf/elf-x86-x32.c
 
-YASM_MODULES += objfmt_elf objfmt_elf32 objfmt_elf64
+YASM_MODULES += objfmt_elf objfmt_elf32 objfmt_elf64 objfmt_elfx32
 
 EXTRA_DIST += modules/objfmts/elf/tests/Makefile.inc
 

diff --git a/modules/objfmts/elf/elf-objfmt.c b/modules/objfmts/elf/elf-objfmt.c
index 1cf725f0d113e15e336ae13d417aa1fd8a8d6dc5..0c3a142639fbcd8629863b982ea59b464ff950b5 100644 (file)
--- a/modules/objfmts/elf/elf-objfmt.c
+++ b/modules/objfmts/elf/elf-objfmt.c
@@ -80,6 +80,7 @@ typedef struct {
 yasm_objfmt_module yasm_elf_LTX_objfmt;
 yasm_objfmt_module yasm_elf32_LTX_objfmt;
 yasm_objfmt_module yasm_elf64_LTX_objfmt;
+yasm_objfmt_module yasm_elfx32_LTX_objfmt;
 
 
 static elf_symtab_entry *
@@ -397,7 +398,9 @@ elf_objfmt_create(yasm_object *object)
     if (objfmt) {
         objfmt_elf = (yasm_objfmt_elf *)objfmt;
         /* Figure out which bitness of object format to use */
-        if (elf_march->bits == 32)
+        if (strcmp (elf_march->machine, "x32") == 0)
+            objfmt_elf->objfmt.module = &yasm_elfx32_LTX_objfmt;
+        else if (elf_march->bits == 32)
             objfmt_elf->objfmt.module = &yasm_elf32_LTX_objfmt;
         else if (elf_march->bits == 64)
             objfmt_elf->objfmt.module = &yasm_elf64_LTX_objfmt;
@@ -417,6 +420,12 @@ elf64_objfmt_create(yasm_object *object)
     return elf_objfmt_create_common(object, &yasm_elf64_LTX_objfmt, 64, NULL);
 }
 
+static yasm_objfmt *
+elfx32_objfmt_create(yasm_object *object)
+{
+    return elf_objfmt_create_common(object, &yasm_elfx32_LTX_objfmt, 32, NULL);
+}
+
 static long
 elf_objfmt_output_align(FILE *f, unsigned int align)
 {
@@ -1363,3 +1372,22 @@ yasm_objfmt_module yasm_elf64_LTX_objfmt = {
     elf_objfmt_section_switch,
     elf_objfmt_get_special_sym
 };
+
+yasm_objfmt_module yasm_elfx32_LTX_objfmt = {
+    "ELF (x32)",
+    "elfx32",
+    "o",
+    64,
+    0,
+    elf_objfmt_dbgfmt_keywords,
+    "null",
+    elf_objfmt_directives,
+    elf_objfmt_stdmacs,
+    elfx32_objfmt_create,
+    elf_objfmt_output,
+    elf_objfmt_destroy,
+    elf_objfmt_add_default_section,
+    elf_objfmt_init_new_section,
+    elf_objfmt_section_switch,
+    elf_objfmt_get_special_sym
+};

diff --git a/modules/objfmts/elf/elf-x86-x32.c b/modules/objfmts/elf/elf-x86-x32.c
new file mode 100644 (file)
index 0000000..40a25a1
--- /dev/null
+++ b/modules/objfmts/elf/elf-x86-x32.c
@@ -0,0 +1,251 @@
+/*
+ * ELF object format helpers - x86:x32
+ *
+ *  Copyright (C) 2012  Michael Urman and H.J. Lu
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND OTHER CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR OTHER CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <util.h>
+
+#include <libyasm.h>
+#define YASM_OBJFMT_ELF_INTERNAL
+#include "elf.h"
+#include "elf-machine.h"
+
+static elf_machine_ssym elf_x86_x32_ssyms[] = {
+    {"plt",         ELF_SSYM_SYM_RELATIVE,  R_X86_64_PLT32,     32},
+    {"gotpcrel",    ELF_SSYM_SYM_RELATIVE,  R_X86_64_GOTPCREL,  32},
+    {"tlsgd",       ELF_SSYM_SYM_RELATIVE|ELF_SSYM_THREAD_LOCAL,
+                    R_X86_64_TLSGD,     32},
+    {"tlsld",       ELF_SSYM_SYM_RELATIVE|ELF_SSYM_THREAD_LOCAL,
+                    R_X86_64_TLSLD,     32},
+    {"gottpoff",    ELF_SSYM_SYM_RELATIVE|ELF_SSYM_THREAD_LOCAL,
+                    R_X86_64_GOTTPOFF,  32},
+    {"tpoff",       ELF_SSYM_SYM_RELATIVE|ELF_SSYM_THREAD_LOCAL,
+                    R_X86_64_TPOFF32,   32},
+    {"dtpoff",      ELF_SSYM_SYM_RELATIVE|ELF_SSYM_THREAD_LOCAL,
+                    R_X86_64_DTPOFF32,  32},
+    {"got",         ELF_SSYM_SYM_RELATIVE,  R_X86_64_GOT32,     32},
+    {"tlsdesc",     ELF_SSYM_SYM_RELATIVE|ELF_SSYM_THREAD_LOCAL,
+                    R_X86_64_GOTPC32_TLSDESC,   32},
+    {"tlscall",     ELF_SSYM_SYM_RELATIVE|ELF_SSYM_THREAD_LOCAL,
+                    R_X86_64_TLSDESC_CALL,      32}
+};
+
+static int
+elf_x86_x32_accepts_reloc(size_t val, yasm_symrec *wrt)
+{
+    if (wrt) {
+        const elf_machine_ssym *ssym = (elf_machine_ssym *)
+            yasm_symrec_get_data(wrt, &elf_ssym_symrec_data);
+        if (!ssym || val != ssym->size)
+            return 0;
+        return 1;
+    }
+    return (val&(val-1)) ? 0 : ((val & (8|16|32)) != 0);
+}
+
+static void
+elf_x86_x32_write_symtab_entry(unsigned char *bufp,
+                              elf_symtab_entry *entry,
+                              yasm_intnum *value_intn,
+                              yasm_intnum *size_intn)
+{
+    YASM_WRITE_32_L(bufp, entry->name ? entry->name->index : 0);
+    YASM_WRITE_32I_L(bufp, value_intn);
+    YASM_WRITE_32I_L(bufp, size_intn);
+
+    YASM_WRITE_8(bufp, ELF32_ST_INFO(entry->bind, entry->type));
+    YASM_WRITE_8(bufp, ELF32_ST_OTHER(entry->vis));
+    if (entry->sect) {
+        elf_secthead *shead =
+            yasm_section_get_data(entry->sect, &elf_section_data);
+        if (!shead)
+            yasm_internal_error(N_("symbol references section without data"));
+        YASM_WRITE_16_L(bufp, shead->index);
+    } else {
+        YASM_WRITE_16_L(bufp, entry->index);
+    }
+}
+
+static void
+elf_x86_x32_write_secthead(unsigned char *bufp, elf_secthead *shead)
+{
+    YASM_WRITE_32_L(bufp, shead->name ? shead->name->index : 0);
+    YASM_WRITE_32_L(bufp, shead->type);
+    YASM_WRITE_32_L(bufp, shead->flags);
+    YASM_WRITE_32_L(bufp, 0);          /* vmem address */
+    YASM_WRITE_32_L(bufp, shead->offset);
+    YASM_WRITE_32I_L(bufp, shead->size);
+
+    YASM_WRITE_32_L(bufp, shead->link);
+    YASM_WRITE_32_L(bufp, shead->info);
+
+    YASM_WRITE_32_L(bufp, shead->align);
+    YASM_WRITE_32_L(bufp, shead->entsize);
+}
+
+static void
+elf_x86_x32_write_secthead_rel(unsigned char *bufp,
+                              elf_secthead *shead,
+                              elf_section_index symtab_idx,
+                              elf_section_index sindex)
+{
+    yasm_intnum *nreloc;
+    yasm_intnum *relocsize;
+
+    YASM_WRITE_32_L(bufp, shead->rel_name ? shead->rel_name->index : 0);
+    YASM_WRITE_32_L(bufp, SHT_RELA);
+    YASM_WRITE_32_L(bufp, 0);
+    YASM_WRITE_32_L(bufp, 0);
+    YASM_WRITE_32_L(bufp, shead->rel_offset);
+
+    nreloc = yasm_intnum_create_uint(shead->nreloc);
+    relocsize = yasm_intnum_create_uint(RELOC32A_SIZE);
+    yasm_intnum_calc(relocsize, YASM_EXPR_MUL, nreloc);
+    YASM_WRITE_32I_L(bufp, relocsize);          /* size */
+    yasm_intnum_destroy(nreloc);
+    yasm_intnum_destroy(relocsize);
+
+    YASM_WRITE_32_L(bufp, symtab_idx);          /* link: symtab index */
+    YASM_WRITE_32_L(bufp, shead->index);        /* info: relocated's index */
+    YASM_WRITE_32_L(bufp, RELOC32_ALIGN);      /* align */
+    YASM_WRITE_32_L(bufp, RELOC32A_SIZE);      /* entity size */
+}
+
+static void
+elf_x86_x32_handle_reloc_addend(yasm_intnum *intn,
+                                  elf_reloc_entry *reloc,
+                                  unsigned long offset)
+{
+    /* .rela: copy value out as addend, replace original with 0 */
+    reloc->addend = yasm_intnum_copy(intn);
+    yasm_intnum_zero(intn);
+}
+
+static unsigned int
+elf_x86_x32_map_reloc_info_to_type(elf_reloc_entry *reloc)
+{
+    if (reloc->wrt) {
+        const elf_machine_ssym *ssym = (elf_machine_ssym *)
+            yasm_symrec_get_data(reloc->wrt, &elf_ssym_symrec_data);
+        if (!ssym || reloc->valsize != ssym->size)
+            yasm_internal_error(N_("Unsupported WRT"));
+
+        /* Force TLS type; this is required by the linker. */
+        if (ssym->sym_rel & ELF_SSYM_THREAD_LOCAL) {
+            elf_symtab_entry *esym;
+
+            esym = yasm_symrec_get_data(reloc->reloc.sym, &elf_symrec_data);
+            if (esym)
+                esym->type = STT_TLS;
+        }
+        /* Map PC-relative GOT to appropriate relocation */
+        if (reloc->rtype_rel && ssym->reloc == R_X86_64_GOT32)
+            return (unsigned char) R_X86_64_GOTPCREL;
+        return (unsigned char) ssym->reloc;
+    } else if (reloc->is_GOT_sym && reloc->valsize == 32) {
+        return (unsigned char) R_X86_64_GOTPC32;
+    } else if (reloc->is_GOT_sym && reloc->valsize == 64) {
+       yasm_internal_error(N_("Unsupported relocation size"));
+    } else if (reloc->rtype_rel) {
+        switch (reloc->valsize) {
+            case 8: return (unsigned char) R_X86_64_PC8;
+            case 16: return (unsigned char) R_X86_64_PC16;
+            case 32: return (unsigned char) R_X86_64_PC32;
+            default: yasm_internal_error(N_("Unsupported relocation size"));
+        }
+    } else {
+        switch (reloc->valsize) {
+            case 8: return (unsigned char) R_X86_64_8;
+            case 16: return (unsigned char) R_X86_64_16;
+            case 32: return (unsigned char) R_X86_64_32;
+            case 64: return (unsigned char) R_X86_64_64;
+            default: yasm_internal_error(N_("Unsupported relocation size"));
+        }
+    }
+    return 0;
+}
+
+static void
+elf_x86_x32_write_reloc(unsigned char *bufp, elf_reloc_entry *reloc,
+                          unsigned int r_type, unsigned int r_sym)
+{
+    YASM_WRITE_32I_L(bufp, reloc->reloc.addr);
+    YASM_WRITE_32_L(bufp, ELF32_R_INFO((unsigned long)r_sym, (unsigned char)r_type));
+    if (reloc->addend)
+        YASM_WRITE_32I_L(bufp, reloc->addend);
+    else {
+        YASM_WRITE_32_L(bufp, 0);
+    }
+}
+
+static void
+elf_x86_x32_write_proghead(unsigned char **bufpp,
+                             elf_offset secthead_addr,
+                             unsigned long secthead_count,
+                             elf_section_index shstrtab_index)
+{
+    unsigned char *bufp = *bufpp;
+    unsigned char *buf = bufp-4;
+    YASM_WRITE_8(bufp, ELFCLASS32);         /* elf class */
+    YASM_WRITE_8(bufp, ELFDATA2LSB);        /* data encoding :: MSB? */
+    YASM_WRITE_8(bufp, EV_CURRENT);         /* elf version */
+    YASM_WRITE_8(bufp, ELFOSABI_SYSV);      /* os/abi */
+    YASM_WRITE_8(bufp, 0);                  /* SYSV v3 ABI=0 */
+    while (bufp-buf < EI_NIDENT)            /* e_ident padding */
+        YASM_WRITE_8(bufp, 0);
+
+    YASM_WRITE_16_L(bufp, ET_REL);          /* e_type - object file */
+    YASM_WRITE_16_L(bufp, EM_X86_64);       /* e_machine - or others */
+    YASM_WRITE_32_L(bufp, EV_CURRENT);      /* elf version */
+    YASM_WRITE_32_L(bufp, 0);               /* e_entry */
+    YASM_WRITE_32_L(bufp, 0);               /* e_phoff */
+    YASM_WRITE_32_L(bufp, secthead_addr);   /* e_shoff secthead off */
+
+    YASM_WRITE_32_L(bufp, 0);               /* e_flags */
+    YASM_WRITE_16_L(bufp, EHDR32_SIZE);     /* e_ehsize */
+    YASM_WRITE_16_L(bufp, 0);               /* e_phentsize */
+    YASM_WRITE_16_L(bufp, 0);               /* e_phnum */
+    YASM_WRITE_16_L(bufp, SHDR32_SIZE);     /* e_shentsize */
+    YASM_WRITE_16_L(bufp, secthead_count);  /* e_shnum */
+    YASM_WRITE_16_L(bufp, shstrtab_index);  /* e_shstrndx */
+    *bufpp = bufp;
+}
+
+const elf_machine_handler
+elf_machine_handler_x86_x32 = {
+    "x86", "x32", ".rela",
+    SYMTAB32_SIZE, SYMTAB32_ALIGN, RELOC32A_SIZE, SHDR32_SIZE, EHDR32_SIZE,
+    elf_x86_x32_accepts_reloc,
+    elf_x86_x32_write_symtab_entry,
+    elf_x86_x32_write_secthead,
+    elf_x86_x32_write_secthead_rel,
+    elf_x86_x32_handle_reloc_addend,
+    elf_x86_x32_map_reloc_info_to_type,
+    elf_x86_x32_write_reloc,
+    elf_x86_x32_write_proghead,
+    elf_x86_x32_ssyms,
+    sizeof(elf_x86_x32_ssyms)/sizeof(elf_x86_x32_ssyms[0]),
+    32
+};

diff --git a/modules/objfmts/elf/elf.c b/modules/objfmts/elf/elf.c
index 7adf7ea9f2ad18d20cdc96d71faf1e18c4beafe0..addec913dcf750018c3cef680f7a25aabc75ff95 100644 (file)
--- a/modules/objfmts/elf/elf.c
+++ b/modules/objfmts/elf/elf.c
@@ -56,12 +56,14 @@ const yasm_assoc_data_callback elf_ssym_symrec_data = {
 
 extern elf_machine_handler
     elf_machine_handler_x86_x86,
-    elf_machine_handler_x86_amd64;
+    elf_machine_handler_x86_amd64,
+    elf_machine_handler_x86_x32;
 
 static const elf_machine_handler *elf_machine_handlers[] =
 {
     &elf_machine_handler_x86_x86,
     &elf_machine_handler_x86_amd64,
+    &elf_machine_handler_x86_x32,
     NULL
 };
 static const elf_machine_handler elf_null_machine = {0, 0, 0, 0, 0, 0, 0, 0,
@@ -81,9 +83,13 @@ elf_set_arch(yasm_arch *arch, yasm_symtab *symtab, int bits_pref)
          elf_march = elf_machine_handlers[++i])
     {
         if (yasm__strcasecmp(yasm_arch_keyword(arch), elf_march->arch)==0)
-            if (yasm__strcasecmp(machine, elf_march->machine)==0)
+            if (yasm__strcasecmp(machine, elf_march->machine)==0) {
                 if (bits_pref == 0 || bits_pref == elf_march->bits)
                     break;
+            } else if (bits_pref == elf_march->bits
+                       && yasm__strcasecmp(machine, "amd64") == 0
+                       && yasm__strcasecmp(elf_march->machine, "x32") == 0)
+                break;
     }
 
     if (elf_march && elf_march->num_ssyms > 0)

diff --git a/modules/objfmts/elf/tests/Makefile.inc b/modules/objfmts/elf/tests/Makefile.inc
index e6d421c0c3b85b8fc1f45947c0d9a1732ee4cefc..0980329cf7afaf543fa0e4fffbb485ff3fb8c7a5 100644 (file)
--- a/modules/objfmts/elf/tests/Makefile.inc
+++ b/modules/objfmts/elf/tests/Makefile.inc
@@ -47,9 +47,13 @@ EXTRA_DIST += modules/objfmts/elf/tests/nasm-forceident.asm
 EXTRA_DIST += modules/objfmts/elf/tests/nasm-forceident.hex
 
 EXTRA_DIST += modules/objfmts/elf/tests/amd64/Makefile.inc
+EXTRA_DIST += modules/objfmts/elf/tests/x32/Makefile.inc
 EXTRA_DIST += modules/objfmts/elf/tests/gas32/Makefile.inc
 EXTRA_DIST += modules/objfmts/elf/tests/gas64/Makefile.inc
+EXTRA_DIST += modules/objfmts/elf/tests/gasx32/Makefile.inc
 
 include modules/objfmts/elf/tests/amd64/Makefile.inc
+include modules/objfmts/elf/tests/x32/Makefile.inc
 include modules/objfmts/elf/tests/gas32/Makefile.inc
 include modules/objfmts/elf/tests/gas64/Makefile.inc
+include modules/objfmts/elf/tests/gasx32/Makefile.inc

diff --git a/modules/objfmts/elf/tests/gasx32/Makefile.inc b/modules/objfmts/elf/tests/gasx32/Makefile.inc
new file mode 100644 (file)
index 0000000..6bba8bd
--- /dev/null
+++ b/modules/objfmts/elf/tests/gasx32/Makefile.inc
@@ -0,0 +1,11 @@
+TESTS += modules/objfmts/elf/tests/gasx32/elf_gasx32_test.sh
+
+EXTRA_DIST += modules/objfmts/elf/tests/gasx32/elf_gasx32_test.sh
+EXTRA_DIST += modules/objfmts/elf/tests/gasx32/crosssect.asm
+EXTRA_DIST += modules/objfmts/elf/tests/gasx32/crosssect.hex
+EXTRA_DIST += modules/objfmts/elf/tests/gasx32/elf_gasx32_curpos.asm
+EXTRA_DIST += modules/objfmts/elf/tests/gasx32/elf_gasx32_curpos.hex
+EXTRA_DIST += modules/objfmts/elf/tests/gasx32/elf_gasx32_reloc.asm
+EXTRA_DIST += modules/objfmts/elf/tests/gasx32/elf_gasx32_reloc.hex
+EXTRA_DIST += modules/objfmts/elf/tests/gasx32/elf_gasx32_ssym.asm
+EXTRA_DIST += modules/objfmts/elf/tests/gasx32/elf_gasx32_ssym.hex

diff --git a/modules/objfmts/elf/tests/gasx32/crosssect.asm b/modules/objfmts/elf/tests/gasx32/crosssect.asm
new file mode 100644 (file)
index 0000000..4199979
--- /dev/null
+++ b/modules/objfmts/elf/tests/gasx32/crosssect.asm
@@ -0,0 +1,18 @@
+.section .rodata
+       .align 4
+_sys_srt:
+       .long 0
+
+.text
+       .align 4,0x90
+       .long _sys_srt-.
+       .long _sys_srt-_sys_info
+       #.long _sys_info-_sys_srt
+       #.long -(_sys_srt-_sys_info)
+       .long _sys_info-.
+       .long .-_sys_info
+       .long (_sys_srt-.)+(.-_sys_info) # GAS cannot handle this but we can
+       .long 0
+       .long 65558
+_sys_info:
+       .long 0

diff --git a/modules/objfmts/elf/tests/gasx32/crosssect.hex b/modules/objfmts/elf/tests/gasx32/crosssect.hex
new file mode 100644 (file)
index 0000000..35893c4
--- /dev/null
+++ b/modules/objfmts/elf/tests/gasx32/crosssect.hex
@@ -0,0 +1,568 @@
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diff --git a/modules/objfmts/elf/tests/gasx32/elf_gasx32_curpos.asm b/modules/objfmts/elf/tests/gasx32/elf_gasx32_curpos.asm
new file mode 100644 (file)
index 0000000..60a893b
--- /dev/null
+++ b/modules/objfmts/elf/tests/gasx32/elf_gasx32_curpos.asm
@@ -0,0 +1,27 @@
+.globl bar
+.globl foo
+
+.section .bar
+bar:
+.4byte foo-.
+.4byte baz-.
+call foo
+call baz
+foo:
+
+.section .data
+baz:
+.4byte foo-.
+#.4byte .-foo  # illegal
+.4byte baz-.
+.4byte .-baz
+.4byte foo+4-.         # with constant
+.4byte .-baz+foo+4-.   # both local and cross-segment (legal)
+#.4byte baz+foo+4-.-.  # ditto, slightly different - GAS gets confused on this
+#.4byte (bar-.)+(foo-.)        # illegal (too many cross-segment)
+.4byte baz-.+baz-.     # two from same segment
+
+.section .text
+movl $5, foo-.
+movl $(foo-.), %eax
+call foo

diff --git a/modules/objfmts/elf/tests/gasx32/elf_gasx32_curpos.hex b/modules/objfmts/elf/tests/gasx32/elf_gasx32_curpos.hex
new file mode 100644 (file)
index 0000000..45cb217
--- /dev/null
+++ b/modules/objfmts/elf/tests/gasx32/elf_gasx32_curpos.hex
@@ -0,0 +1,848 @@
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diff --git a/modules/objfmts/elf/tests/gasx32/elf_gasx32_reloc.asm b/modules/objfmts/elf/tests/gasx32/elf_gasx32_reloc.asm
new file mode 100644 (file)
index 0000000..e015ce4
--- /dev/null
+++ b/modules/objfmts/elf/tests/gasx32/elf_gasx32_reloc.asm
@@ -0,0 +1,37 @@
+.comm _ZEROVAR, 32, 16
+.comm _VAR, 16, 16
+.data
+.org 0
+_ZEROVAR:
+.org 0xa0
+.globl _VAR
+.type _VAR, @object
+.size _VAR, 16
+_VAR:
+.4byte 0
+.4byte 0
+.4byte 0
+.4byte 0
+.org 0xc0
+_VAR2:
+.org 0xe0
+.globl _VAR3
+_VAR3:
+
+.text
+movq $0, %rax
+movq _VAR, %rax
+movq %rax, _VAR(%rip)
+movq _VAR+8(%rip), %rcx
+movlpd _VAR(%rip), %xmm1
+
+movq _VAR2, %rax
+movq %rax, _VAR2(%rip)
+movq _VAR2+8(%rip), %rcx
+movlpd _VAR2(%rip), %xmm1
+
+movq _VAR3, %rax
+movq %rax, _VAR3(%rip)
+movq _VAR3+8(%rip), %rcx
+movlpd _VAR3(%rip), %xmm1
+

diff --git a/modules/objfmts/elf/tests/gasx32/elf_gasx32_reloc.hex b/modules/objfmts/elf/tests/gasx32/elf_gasx32_reloc.hex
new file mode 100644 (file)
index 0000000..1b46fa1
--- /dev/null
+++ b/modules/objfmts/elf/tests/gasx32/elf_gasx32_reloc.hex
@@ -0,0 +1,1016 @@
+7f 
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diff --git a/modules/objfmts/elf/tests/gasx32/elf_gasx32_ssym.asm b/modules/objfmts/elf/tests/gasx32/elf_gasx32_ssym.asm
new file mode 100644 (file)
index 0000000..b7203f6
--- /dev/null
+++ b/modules/objfmts/elf/tests/gasx32/elf_gasx32_ssym.asm
@@ -0,0 +1,10 @@
+.text
+foo:
+movl %eax, foo@PLT
+movl %eax, foo@GOTPCREL
+movl %eax, bar@TLSGD
+movl %eax, bar@TLSLD
+movl %eax, bar@GOTTPOFF
+movl %eax, bar@TPOFF
+movl %eax, bar@DTPOFF
+movl %eax, foo@GOT

diff --git a/modules/objfmts/elf/tests/gasx32/elf_gasx32_ssym.hex b/modules/objfmts/elf/tests/gasx32/elf_gasx32_ssym.hex
new file mode 100644 (file)
index 0000000..cac3990
--- /dev/null
+++ b/modules/objfmts/elf/tests/gasx32/elf_gasx32_ssym.hex
@@ -0,0 +1,592 @@
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diff --git a/modules/objfmts/elf/tests/gasx32/elf_gasx32_test.sh b/modules/objfmts/elf/tests/gasx32/elf_gasx32_test.sh
new file mode 100755 (executable)
index 0000000..f5372cb
--- /dev/null
+++ b/modules/objfmts/elf/tests/gasx32/elf_gasx32_test.sh
@@ -0,0 +1,3 @@
+#! /bin/sh
+${srcdir}/out_test.sh elf_gasx32_test modules/objfmts/elf/tests/gasx32 "GAS elf-x32 objfmt" "-f elfx32 -p gas" ".o"
+exit $?

diff --git a/modules/objfmts/elf/tests/x32/Makefile.inc b/modules/objfmts/elf/tests/x32/Makefile.inc
new file mode 100644 (file)
index 0000000..d62ba3e
--- /dev/null
+++ b/modules/objfmts/elf/tests/x32/Makefile.inc
@@ -0,0 +1,11 @@
+TESTS += modules/objfmts/elf/tests/x32/elf_x32_test.sh
+
+EXTRA_DIST += modules/objfmts/elf/tests/x32/elf_x32_test.sh
+EXTRA_DIST += modules/objfmts/elf/tests/x32/elf-rip.asm
+EXTRA_DIST += modules/objfmts/elf/tests/x32/elf-rip.hex
+EXTRA_DIST += modules/objfmts/elf/tests/x32/elfso32.asm
+EXTRA_DIST += modules/objfmts/elf/tests/x32/elfso32.hex
+EXTRA_DIST += modules/objfmts/elf/tests/x32/gotpcrel.asm
+EXTRA_DIST += modules/objfmts/elf/tests/x32/gotpcrel.hex
+EXTRA_DIST += modules/objfmts/elf/tests/x32/multiplefixup.asm
+EXTRA_DIST += modules/objfmts/elf/tests/x32/multiplefixup.hex

diff --git a/modules/objfmts/elf/tests/x32/elf-rip.asm b/modules/objfmts/elf/tests/x32/elf-rip.asm
new file mode 100644 (file)
index 0000000..5f10f09
--- /dev/null
+++ b/modules/objfmts/elf/tests/x32/elf-rip.asm
@@ -0,0 +1,7 @@
+[bits 64]
+[extern sym]
+mov eax, [rip]
+mov eax, [rip+2]
+mov eax, [rip+sym]
+mov eax, [sym wrt rip]
+call sym

diff --git a/modules/objfmts/elf/tests/x32/elf-rip.hex b/modules/objfmts/elf/tests/x32/elf-rip.hex
new file mode 100644 (file)
index 0000000..be5da68
--- /dev/null
+++ b/modules/objfmts/elf/tests/x32/elf-rip.hex
@@ -0,0 +1,496 @@
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diff --git a/modules/objfmts/elf/tests/x32/elf_x32_test.sh b/modules/objfmts/elf/tests/x32/elf_x32_test.sh
new file mode 100755 (executable)
index 0000000..3961816
--- /dev/null
+++ b/modules/objfmts/elf/tests/x32/elf_x32_test.sh
@@ -0,0 +1,3 @@
+#! /bin/sh
+${srcdir}/out_test.sh elf_x32_test modules/objfmts/elf/tests/x32 "elf-x32 objfmt" "-f elf -m x32" ".o"
+exit $?

diff --git a/modules/objfmts/elf/tests/x32/elfsox32.asm b/modules/objfmts/elf/tests/x32/elfsox32.asm
new file mode 100644 (file)
index 0000000..931c7ff
--- /dev/null
+++ b/modules/objfmts/elf/tests/x32/elfsox32.asm
@@ -0,0 +1,90 @@
+; This code is UNTESTED, and almost certainly DOES NOT WORK!
+; Do NOT use this as an example of how to write AMD64 shared libraries!
+; This code is simply to test the AMD64 ELF WRT relocations.
+
+; This file should test the following:
+; [1] Define and export a global text-section symbol
+; [2] Define and export a global data-section symbol
+; [3] Define and export a global BSS-section symbol
+; [4] Define a non-global text-section symbol
+; [5] Define a non-global data-section symbol
+; [6] Define a non-global BSS-section symbol
+; [7] Define a COMMON symbol
+; [8] Define a NASM local label
+; [9] Reference a NASM local label
+; [10] Import an external symbol
+; [11] Make a PC-relative call to an external symbol
+; [12] Reference a text-section symbol in the text section
+; [13] Reference a data-section symbol in the text section
+; [14] Reference a BSS-section symbol in the text section
+; [15] Reference a text-section symbol in the data section
+; [16] Reference a data-section symbol in the data section
+; [17] Reference a BSS-section symbol in the data section
+
+         [BITS 64]
+         [GLOBAL lrotate:function] ; [1]
+         [GLOBAL greet:function]       ; [1]
+         [GLOBAL asmstr:data asmstr.end-asmstr] ; [2]
+         [GLOBAL textptr:data 4]       ; [2]
+         [GLOBAL selfptr:data 4]       ; [2]
+         [GLOBAL integer:data 4]       ; [3]
+         [EXTERN printf]               ; [10]
+         [COMMON commvar 4:4]  ; [7]
+         [EXTERN _GLOBAL_OFFSET_TABLE_]
+
+         [SECTION .text]
+
+; prototype: long lrotate(long x, int num);
+lrotate:                       ; [1]
+         push rbp
+         mov rbp,rsp
+         mov rax,[rbp+8]
+         mov rcx,[rbp+12]
+.label   rol rax,1             ; [4] [8]
+         loop .label           ; [9] [12]
+         mov rsp,rbp
+         pop rbp
+         ret
+
+; prototype: void greet(void);
+greet    push rbx              ; we'll use RBX for GOT, so save it
+         mov rbx,[integer wrt ..gotpcrel wrt rip]
+         mov rax,[rbx] ; [14]
+         inc rax
+         mov rbx,[_GLOBAL_OFFSET_TABLE_ wrt ..gotpcrel wrt rip]
+         mov [rbx+localint wrt ..got],eax ; [14]
+         mov rax,[rbx+commvar wrt ..got]
+         push qword [rax]
+         mov rax,[rbx+localptr wrt ..got] ; [13]
+         push qword [rax]
+         mov rax,[rbx+integer wrt ..got] ; [1] [14]
+         push qword [rax]
+         lea rax,[rbx+printfstr wrt ..got]
+         push rax              ; [13]
+         call printf wrt ..plt ; [11]
+         add rsp,16
+         pop rbx
+         ret
+
+         [SECTION .data]
+
+; a string
+asmstr   db 'hello, world', 0  ; [2]
+.end
+
+; a string for Printf
+printfstr db "integer==%d, localint==%d, commvar=%d"
+         db 10, 0
+
+; some pointers
+localptr  dd localint          ; [5] [17]
+textptr          dd greet wrt ..sym    ; [15]
+selfptr          dd selfptr wrt ..sym  ; [16]
+
+         [SECTION .bss]
+
+; an integer
+integer          resd 1                ; [3]
+
+; a local integer
+localint  resd 1               ; [6]

diff --git a/modules/objfmts/elf/tests/x32/elfsox32.hex b/modules/objfmts/elf/tests/x32/elfsox32.hex
new file mode 100644 (file)
index 0000000..d423b2d
--- /dev/null
+++ b/modules/objfmts/elf/tests/x32/elfsox32.hex
@@ -0,0 +1,1176 @@
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diff --git a/modules/objfmts/elf/tests/x32/gotpcrel.asm b/modules/objfmts/elf/tests/x32/gotpcrel.asm
new file mode 100644 (file)
index 0000000..c3d1238
--- /dev/null
+++ b/modules/objfmts/elf/tests/x32/gotpcrel.asm
@@ -0,0 +1,6 @@
+var:
+mov rax, [var wrt ..got]
+mov rax, [var wrt ..gotpcrel]          ; should be error/warning?
+mov rax, [rel var wrt ..got]           ; automatic promotion to GOTPCREL
+mov rax, [rel var wrt ..gotpcrel]
+

diff --git a/modules/objfmts/elf/tests/x32/gotpcrel.hex b/modules/objfmts/elf/tests/x32/gotpcrel.hex
new file mode 100644 (file)
index 0000000..695cf7d
--- /dev/null
+++ b/modules/objfmts/elf/tests/x32/gotpcrel.hex
@@ -0,0 +1,496 @@
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diff --git a/modules/objfmts/elf/tests/x32/multiplefixup.asm b/modules/objfmts/elf/tests/x32/multiplefixup.asm
new file mode 100644 (file)
index 0000000..ec253cb
--- /dev/null
+++ b/modules/objfmts/elf/tests/x32/multiplefixup.asm
@@ -0,0 +1,8 @@
+[section .data]
+foobar:
+       dq      42
+[section .text]
+foo:
+       times 4 mov rax, [rel foobar]
+       times 4 mov rax, [foobar]
+       times 4 jmp foo

diff --git a/modules/objfmts/elf/tests/x32/multiplefixup.hex b/modules/objfmts/elf/tests/x32/multiplefixup.hex
new file mode 100644 (file)
index 0000000..a187428
--- /dev/null
+++ b/modules/objfmts/elf/tests/x32/multiplefixup.hex
@@ -0,0 +1,680 @@
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diff --git a/modules/objfmts/yasm_objfmts.xml b/modules/objfmts/yasm_objfmts.xml
index 13811a07a89dfd1f280d9ca4db0c5da3d114978e..f4c9a75b47112062dd54da9b166c20e5b6e91bac 100644 (file)
--- a/modules/objfmts/yasm_objfmts.xml
+++ b/modules/objfmts/yasm_objfmts.xml
@@ -96,11 +96,12 @@
  <refsect1>
   <title>elf</title>
 
-  <para>The ELF object format really comes in two flavors:
-   <quote>elf32</quote> (for 32-bit targets) and <quote>elf64</quote>
-   (for 64-bit targets).  ELF is a standard object format in common
-   use on modern Unix and compatible systems (e.g. Linux, FreeBSD).
-   ELF has complex support for relocatable and shared objects.</para>
+  <para>The ELF object format really comes in three flavors:
+   <quote>elf32</quote> (for 32-bit targets), <quote>elf64</quote>
+   (for 64-bit targets and <quote>elfx32</quote> (for x32 targets).
+   ELF is a standard object format in common use on modern Unix and
+   compatible systems (e.g. Linux, FreeBSD).  ELF has complex support
+   for relocatable and shared objects.</para>
  </refsect1>
 
  <refsect1>