[PULL 11/42] bsd-user: Eliminate elf personality

[imp@bsdimp.com]

From: Warner Losh <imp@bsdimp.com>

The linux kernel supports a number of different ELF binaries. The Linux userland
emulator inheritted some of that. And we inheritted it from there. However, for
BSD there's only one kind of ELF file supported per platform, so there's no need
to cope with historical quirks. Simply the code as a result.

Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 bsd-user/elfload.c | 87 ----------------------------------------------
 bsd-user/qemu.h    |  1 -
 2 files changed, 88 deletions(-)

diff --git a/bsd-user/elfload.c b/bsd-user/elfload.c
index 639673f5b7..e950732978 100644
--- a/bsd-user/elfload.c
+++ b/bsd-user/elfload.c
@@ -25,66 +25,6 @@
 
 #include "target_arch_elf.h"
 
-/* from personality.h */
-
-/*
- * Flags for bug emulation.
- *
- * These occupy the top three bytes.
- */
-enum {
-        ADDR_NO_RANDOMIZE =     0x0040000,      /* disable randomization of VA space */
-        FDPIC_FUNCPTRS =        0x0080000,      /* userspace function ptrs point to descriptors
-                                                 * (signal handling)
-                                                 */
-        MMAP_PAGE_ZERO =        0x0100000,
-        ADDR_COMPAT_LAYOUT =    0x0200000,
-        READ_IMPLIES_EXEC =     0x0400000,
-        ADDR_LIMIT_32BIT =      0x0800000,
-        SHORT_INODE =           0x1000000,
-        WHOLE_SECONDS =         0x2000000,
-        STICKY_TIMEOUTS =       0x4000000,
-        ADDR_LIMIT_3GB =        0x8000000,
-};
-
-/*
- * Personality types.
- *
- * These go in the low byte.  Avoid using the top bit, it will
- * conflict with error returns.
- */
-enum {
-        PER_LINUX =             0x0000,
-        PER_LINUX_32BIT =       0x0000 | ADDR_LIMIT_32BIT,
-        PER_LINUX_FDPIC =       0x0000 | FDPIC_FUNCPTRS,
-        PER_SVR4 =              0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
-        PER_SVR3 =              0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
-        PER_SCOSVR3 =           0x0003 | STICKY_TIMEOUTS |
-                                         WHOLE_SECONDS | SHORT_INODE,
-        PER_OSR5 =              0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
-        PER_WYSEV386 =          0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
-        PER_ISCR4 =             0x0005 | STICKY_TIMEOUTS,
-        PER_BSD =               0x0006,
-        PER_SUNOS =             0x0006 | STICKY_TIMEOUTS,
-        PER_XENIX =             0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
-        PER_LINUX32 =           0x0008,
-        PER_LINUX32_3GB =       0x0008 | ADDR_LIMIT_3GB,
-        PER_IRIX32 =            0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */
-        PER_IRIXN32 =           0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */
-        PER_IRIX64 =            0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */
-        PER_RISCOS =            0x000c,
-        PER_SOLARIS =           0x000d | STICKY_TIMEOUTS,
-        PER_UW7 =               0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
-        PER_OSF4 =              0x000f,                  /* OSF/1 v4 */
-        PER_HPUX =              0x0010,
-        PER_MASK =              0x00ff,
-};
-
-/*
- * Return the base personality without flags.
- */
-#define personality(pers)       (pers & PER_MASK)
-
 /* this flag is uneffective under linux too, should be deleted */
 #ifndef MAP_DENYWRITE
 #define MAP_DENYWRITE 0
@@ -750,7 +690,6 @@ int load_elf_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs,
     abi_ulong load_addr, load_bias;
     int load_addr_set = 0;
     unsigned int interpreter_type = INTERPRETER_NONE;
-    unsigned char ibcs2_interpreter;
     int i;
     struct elf_phdr * elf_ppnt;
     struct elf_phdr *elf_phdata;
@@ -765,7 +704,6 @@ int load_elf_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs,
 #endif
     char passed_fileno[6];
 
-    ibcs2_interpreter = 0;
     load_addr = 0;
     load_bias = 0;
     elf_ex = *((struct elfhdr *) bprm->buf);          /* exec-header */
@@ -856,20 +794,6 @@ int load_elf_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs,
                 exit(-1);
             }
 
-            /* If the program interpreter is one of these two,
-               then assume an iBCS2 image. Otherwise assume
-               a native linux image. */
-
-            /* JRP - Need to add X86 lib dir stuff here... */
-
-            if (strcmp(elf_interpreter, "/usr/lib/libc.so.1") == 0 ||
-                strcmp(elf_interpreter, "/usr/lib/ld.so.1") == 0) {
-              ibcs2_interpreter = 1;
-            }
-
-#if 0
-            printf("Using ELF interpreter %s\n", path(elf_interpreter));
-#endif
             if (retval >= 0) {
                 retval = open(path(elf_interpreter), O_RDONLY);
                 if (retval >= 0) {
@@ -1099,7 +1023,6 @@ int load_elf_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs,
         load_symbols(&elf_ex, bprm->fd);
 
     if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd);
-    info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX);
 
 #ifdef LOW_ELF_STACK
     info->start_stack = bprm->p = elf_stack - 4;
@@ -1135,16 +1058,6 @@ int load_elf_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs,
     printf("(brk) %x\n" , info->brk);
 #endif
 
-    if (info->personality == PER_SVR4)
-    {
-            /* Why this, you ask???  Well SVr4 maps page 0 as read-only,
-               and some applications "depend" upon this behavior.
-               Since we do not have the power to recompile these, we
-               emulate the SVr4 behavior.  Sigh.  */
-            target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC,
-                                      MAP_FIXED | MAP_PRIVATE, -1, 0);
-    }
-
     info->entry = elf_entry;
 
     return 0;
diff --git a/bsd-user/qemu.h b/bsd-user/qemu.h
index 6b601ce4b5..e85c164bab 100644
--- a/bsd-user/qemu.h
+++ b/bsd-user/qemu.h
@@ -66,7 +66,6 @@ struct image_info {
     abi_ulong entry;
     abi_ulong code_offset;
     abi_ulong data_offset;
-    int       personality;
 };
 
 #define MAX_SIGQUEUE_SIZE 1024
-- 
2.32.0