/*--------------------------------------------------------------------*/
/*--- Startup: create initial process image on Darwin ---*/
/*--- initimg-darwin.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2000-2017 Julian Seward
jseward@acm.org
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see .
The GNU General Public License is contained in the file COPYING.
*/
#if defined(VGO_darwin)
#include "pub_core_basics.h"
#include "pub_core_vki.h"
#include "pub_core_debuglog.h"
#include "pub_core_libcbase.h"
#include "pub_core_libcassert.h"
#include "pub_core_libcfile.h"
#include "pub_core_libcproc.h"
#include "pub_core_libcprint.h"
#include "pub_core_xarray.h"
#include "pub_core_clientstate.h"
#include "pub_core_aspacemgr.h"
#include "pub_core_mallocfree.h"
#include "pub_core_machine.h"
#include "pub_core_ume.h"
#include "pub_core_options.h"
#include "pub_core_tooliface.h" /* VG_TRACK */
#include "pub_core_threadstate.h" /* ThreadArchState */
#include "priv_initimg_pathscan.h"
#include "pub_core_initimg.h" /* self */
/*====================================================================*/
/*=== Loading the client ===*/
/*====================================================================*/
/* Load the client whose name is VG_(argv_the_exename). */
static void load_client ( /*OUT*/ExeInfo* info,
/*OUT*/Addr* client_ip)
{
const HChar* exe_name;
Int ret;
SysRes res;
vg_assert( VG_(args_the_exename) != NULL);
exe_name = ML_(find_executable)( VG_(args_the_exename) );
if (!exe_name) {
VG_(printf)("valgrind: %s: command not found\n", VG_(args_the_exename));
VG_(exit)(127); // 127 is Posix NOTFOUND
}
VG_(memset)(info, 0, sizeof(*info));
ret = VG_(do_exec)(exe_name, info);
// The client was successfully loaded! Continue.
/* Get hold of a file descriptor which refers to the client
executable. This is needed for attaching to GDB. */
res = VG_(open)(exe_name, VKI_O_RDONLY, VKI_S_IRUSR);
if (!sr_isError(res))
VG_(cl_exec_fd) = sr_Res(res);
/* Copy necessary bits of 'info' that were filled in */
*client_ip = info->init_ip;
}
/*====================================================================*/
/*=== Setting up the client's environment ===*/
/*====================================================================*/
/* Prepare the client's environment. This is basically a copy of our
environment, except:
DYLD_INSERT_LIBRARIES=$VALGRIND_LIB/vgpreload_core-PLATFORM.so:
($VALGRIND_LIB/vgpreload_TOOL-PLATFORM.so:)?
DYLD_INSERT_LIBRARIES
If this is missing, then it is added.
Also, remove any binding for VALGRIND_LAUNCHER=. The client should
not be able to see this.
Also, add DYLD_SHARED_REGION=avoid, because V doesn't know how
to process the dyld shared cache file.
Also, change VYLD_* (mangled by launcher) back to DYLD_*.
If this needs to handle any more variables it should be hacked
into something table driven. The copy is VG_(malloc)'d space.
*/
static HChar** setup_client_env ( HChar** origenv, const HChar* toolname)
{
const HChar* preload_core = "vgpreload_core";
const HChar* ld_preload = "DYLD_INSERT_LIBRARIES=";
const HChar* dyld_cache = "DYLD_SHARED_REGION=";
const HChar* dyld_cache_value= "avoid";
const HChar* v_launcher = VALGRIND_LAUNCHER "=";
Int ld_preload_len = VG_(strlen)( ld_preload );
Int dyld_cache_len = VG_(strlen)( dyld_cache );
Int v_launcher_len = VG_(strlen)( v_launcher );
Bool ld_preload_done = False;
Bool dyld_cache_done = False;
Int vglib_len = VG_(strlen)(VG_(libdir));
HChar** cpp;
HChar** ret;
HChar* preload_tool_path;
Int envc, i;
/* Alloc space for the vgpreload_core.so path and vgpreload_.so
paths. We might not need the space for vgpreload_.so, but it
doesn't hurt to over-allocate briefly. The 16s are just cautious
slop. */
Int preload_core_path_len = vglib_len + sizeof(preload_core)
+ sizeof(VG_PLATFORM) + 16;
Int preload_tool_path_len = vglib_len + VG_(strlen)(toolname)
+ sizeof(VG_PLATFORM) + 16;
Int preload_string_len = preload_core_path_len + preload_tool_path_len;
HChar* preload_string = VG_(malloc)("initimg-darwin.sce.1", preload_string_len);
/* Determine if there's a vgpreload__.so file, and setup
preload_string. */
preload_tool_path = VG_(malloc)("initimg-darwin.sce.2", preload_tool_path_len);
VG_(snprintf)(preload_tool_path, preload_tool_path_len,
"%s/vgpreload_%s-%s.so", VG_(libdir), toolname, VG_PLATFORM);
if (VG_(access)(preload_tool_path, True/*r*/, False/*w*/, False/*x*/) == 0) {
VG_(snprintf)(preload_string, preload_string_len, "%s/%s-%s.so:%s",
VG_(libdir), preload_core, VG_PLATFORM, preload_tool_path);
} else {
VG_(snprintf)(preload_string, preload_string_len, "%s/%s-%s.so",
VG_(libdir), preload_core, VG_PLATFORM);
}
VG_(free)(preload_tool_path);
VG_(debugLog)(2, "initimg", "preload_string:\n");
VG_(debugLog)(2, "initimg", " \"%s\"\n", preload_string);
/* Count the original size of the env */
envc = 0;
for (cpp = origenv; cpp && *cpp; cpp++)
envc++;
/* Allocate a new space */
ret = VG_(malloc) ("initimg-darwin.sce.3",
sizeof(HChar *) * (envc+2+1)); /* 2 new entries + NULL */
/* copy it over */
for (cpp = ret; *origenv; )
*cpp++ = *origenv++;
*cpp = NULL;
vg_assert(envc == (cpp - ret));
/* Walk over the new environment, mashing as we go */
for (cpp = ret; cpp && *cpp; cpp++) {
if (VG_(memcmp)(*cpp, ld_preload, ld_preload_len) == 0) {
Int len = VG_(strlen)(*cpp) + preload_string_len;
HChar *cp = VG_(malloc)("initimg-darwin.sce.4", len);
VG_(snprintf)(cp, len, "%s%s:%s",
ld_preload, preload_string, (*cpp)+ld_preload_len);
*cpp = cp;
ld_preload_done = True;
}
if (VG_(memcmp)(*cpp, dyld_cache, dyld_cache_len) == 0) {
Int len = dyld_cache_len + VG_(strlen)(dyld_cache_value) + 1;
HChar *cp = VG_(malloc)("initimg-darwin.sce.4.2", len);
VG_(snprintf)(cp, len, "%s%s", dyld_cache, dyld_cache_value);
*cpp = cp;
ld_preload_done = True;
}
}
/* Add the missing bits */
if (!ld_preload_done) {
Int len = ld_preload_len + preload_string_len;
HChar *cp = VG_(malloc) ("initimg-darwin.sce.5", len);
VG_(snprintf)(cp, len, "%s%s", ld_preload, preload_string);
ret[envc++] = cp;
}
if (!dyld_cache_done) {
Int len = dyld_cache_len + VG_(strlen)(dyld_cache_value) + 1;
HChar *cp = VG_(malloc) ("initimg-darwin.sce.5.2", len);
VG_(snprintf)(cp, len, "%s%s", dyld_cache, dyld_cache_value);
ret[envc++] = cp;
}
/* ret[0 .. envc-1] is live now. */
/* Find and remove a binding for VALGRIND_LAUNCHER. */
for (i = 0; i < envc; i++)
if (0 == VG_(memcmp)(ret[i], v_launcher, v_launcher_len))
break;
if (i < envc) {
for (; i < envc-1; i++)
ret[i] = ret[i+1];
envc--;
}
/* Change VYLD_ to DYLD */
for (i = 0; i < envc; i++) {
if (0 == VG_(strncmp)(ret[i], "VYLD_", 5)) {
ret[i][0] = 'D';
}
}
VG_(free)(preload_string);
ret[envc] = NULL;
return ret;
}
/*====================================================================*/
/*=== Setting up the client's stack ===*/
/*====================================================================*/
/* Add a string onto the string table, and return its address */
static HChar *copy_str(HChar **tab, const HChar *str)
{
HChar *cp = *tab;
HChar *orig = cp;
while(*str)
*cp++ = *str++;
*cp++ = '\0';
if (0)
VG_(printf)("copied %p \"%s\" len %lld\n", orig, orig, (Long)(cp-orig));
*tab = cp;
return orig;
}
/* ----------------------------------------------------------------
This sets up the client's initial stack, containing the args,
environment and aux vector.
The format of the stack on Darwin is:
higher address +-----------------+ <- clstack_end
| |
: string table :
| |
+-----------------+
| NULL |
+-----------------+
| executable_path | (first arg to execve())
+-----------------+
| NULL |
- -
| envp |
+-----------------+
| NULL |
- -
| argv |
+-----------------+
| argc |
+-----------------+
| mach_header * | (dynamic only)
lower address +-----------------+ <- sp
| undefined |
: :
Allocate and create the initial client stack. It is allocated down
from clstack_end, which was previously determined by the address
space manager. The returned value is the SP value for the client.
---------------------------------------------------------------- */
static
Addr setup_client_stack( void* init_sp,
HChar** orig_envp,
const ExeInfo* info,
Addr clstack_end,
SizeT clstack_max_size,
const VexArchInfo* vex_archinfo )
{
HChar **cpp;
HChar *strtab; /* string table */
HChar *stringbase;
Addr *ptr;
unsigned stringsize; /* total size of strings in bytes */
unsigned auxsize; /* total size of auxv in bytes */
Int argc; /* total argc */
Int envc; /* total number of env vars */
unsigned stacksize; /* total client stack size */
Addr client_SP; /* client stack base (initial SP) */
Addr clstack_start;
Int i;
vg_assert(VG_IS_PAGE_ALIGNED(clstack_end+1));
vg_assert( VG_(args_for_client) );
/* ==================== compute sizes ==================== */
/* first of all, work out how big the client stack will be */
stringsize = 0;
auxsize = 0;
/* paste on the extra args if the loader needs them (ie, the #!
interpreter and its argument) */
argc = 0;
if (info->interp_name != NULL) {
argc++;
stringsize += VG_(strlen)(info->interp_name) + 1;
}
if (info->interp_args != NULL) {
argc++;
stringsize += VG_(strlen)(info->interp_args) + 1;
}
/* now scan the args we're given... */
stringsize += VG_(strlen)( VG_(args_the_exename) ) + 1;
for (i = 0; i < VG_(sizeXA)( VG_(args_for_client) ); i++) {
argc++;
stringsize += VG_(strlen)( * (HChar**)
VG_(indexXA)( VG_(args_for_client), i ))
+ 1;
}
/* ...and the environment */
envc = 0;
for (cpp = orig_envp; cpp && *cpp; cpp++) {
envc++;
stringsize += VG_(strlen)(*cpp) + 1;
}
/* Darwin executable_path + NULL */
auxsize += 2 * sizeof(Word);
if (info->executable_path) {
stringsize += 1 + VG_(strlen)(info->executable_path);
}
/* Darwin mach_header */
if (info->dynamic) auxsize += sizeof(Word);
/* OK, now we know how big the client stack is */
stacksize =
sizeof(Word) + /* argc */
sizeof(HChar **) + /* argc[0] == exename */
sizeof(HChar **)*argc + /* argv */
sizeof(HChar **) + /* terminal NULL */
sizeof(HChar **)*envc + /* envp */
sizeof(HChar **) + /* terminal NULL */
auxsize + /* auxv */
VG_ROUNDUP(stringsize, sizeof(Word)); /* strings (aligned) */
if (0) VG_(printf)("stacksize = %d\n", stacksize);
/* client_SP is the client's stack pointer */
client_SP = clstack_end + 1 - stacksize;
client_SP = VG_ROUNDDN(client_SP, 32); /* make stack 32 byte aligned */
/* base of the string table (aligned) */
stringbase = strtab = (HChar *)clstack_end
- VG_ROUNDUP(stringsize, sizeof(int));
/* The max stack size */
clstack_max_size = VG_PGROUNDUP(clstack_max_size);
/* Darwin stack is chosen by the ume loader */
clstack_start = clstack_end + 1 - clstack_max_size;
/* Record stack extent -- needed for stack-change code. */
/* GrP fixme really? */
VG_(clstk_start_base) = clstack_start;
VG_(clstk_end) = clstack_end;
if (0)
VG_(printf)("stringsize=%d auxsize=%d stacksize=%d maxsize=0x%x\n"
"clstack_start %p\n"
"clstack_end %p\n",
stringsize, auxsize, stacksize, (Int)clstack_max_size,
(void*)clstack_start, (void*)clstack_end);
/* ==================== allocate space ==================== */
/* Stack was allocated by the ume loader. */
/* ==================== create client stack ==================== */
ptr = (Addr*)client_SP;
/* --- mach_header --- */
if (info->dynamic) *ptr++ = info->text;
/* --- client argc --- */
*ptr++ = (Addr)(argc + 1);
/* --- client argv --- */
if (info->interp_name)
*ptr++ = (Addr)copy_str(&strtab, info->interp_name);
if (info->interp_args)
*ptr++ = (Addr)copy_str(&strtab, info->interp_args);
*ptr++ = (Addr)copy_str(&strtab, VG_(args_the_exename));
for (i = 0; i < VG_(sizeXA)( VG_(args_for_client) ); i++) {
*ptr++ = (Addr)copy_str(
&strtab,
* (HChar**) VG_(indexXA)( VG_(args_for_client), i )
);
}
*ptr++ = 0;
/* --- envp --- */
VG_(client_envp) = (HChar **)ptr;
for (cpp = orig_envp; cpp && *cpp; ptr++, cpp++)
*ptr = (Addr)copy_str(&strtab, *cpp);
*ptr++ = 0;
/* --- executable_path + NULL --- */
if (info->executable_path)
*ptr++ = (Addr)copy_str(&strtab, info->executable_path);
else
*ptr++ = 0;
*ptr++ = 0;
vg_assert((strtab-stringbase) == stringsize);
/* client_SP is pointing at client's argc/argv */
if (0) VG_(printf)("startup SP = %#lx\n", client_SP);
return client_SP;
}
/*====================================================================*/
/*=== Record system memory regions ===*/
/*====================================================================*/
static void record_system_memory(void)
{
/* JRS 2014-Jul-08: this messes up the sync checker, because the
information that the kernel gives us doesn't include anything
about the commpage mapping. This functionality has therefore
been moved to m_main.c, valgrind_main(), section "Tell the tool
about the initial client memory permissions". See comments there
for rationale. */
return;
/*NOTREACHED*/
/* Tell aspacem where the client's kernel commpage is */
#if defined(VGA_amd64)
/* commpage 0x7fff:ffe00000+ - not in vm_region */
// GrP fixme check again
VG_(am_notify_client_mmap)(0x7fffffe00000, 0x7ffffffff000-0x7fffffe00000,
VKI_PROT_READ|VKI_PROT_EXEC, 0, -1, 0);
#elif defined(VGA_x86)
/* commpage 0xfffec000+ - not in vm_region */
// GrP fixme check again
VG_(am_notify_client_mmap)(0xfffec000, 0xfffff000-0xfffec000,
VKI_PROT_READ|VKI_PROT_EXEC, 0, -1, 0);
#else
# error unknown architecture
#endif
}
/*====================================================================*/
/*=== TOP-LEVEL: VG_(ii_create_image) ===*/
/*====================================================================*/
/* Create the client's initial memory image. */
IIFinaliseImageInfo VG_(ii_create_image)( IICreateImageInfo iicii,
const VexArchInfo* vex_archinfo )
{
ExeInfo info;
VG_(memset)( &info, 0, sizeof(info) );
HChar** env = NULL;
IIFinaliseImageInfo iifii;
VG_(memset)( &iifii, 0, sizeof(iifii) );
//--------------------------------------------------------------
// Load client executable, finding in $PATH if necessary
// p: get_helprequest_and_toolname() [for 'exec', 'need_help']
// p: layout_remaining_space [so there's space]
//--------------------------------------------------------------
VG_(debugLog)(1, "initimg", "Loading client\n");
if (VG_(args_the_exename) == NULL)
VG_(err_missing_prog)();
load_client(&info, &iifii.initial_client_IP);
//--------------------------------------------------------------
// Set up client's environment
// p: set-libdir [for VG_(libdir)]
// p: get_helprequest_and_toolname [for toolname]
//--------------------------------------------------------------
VG_(debugLog)(1, "initimg", "Setup client env\n");
env = setup_client_env(iicii.envp, iicii.toolname);
//--------------------------------------------------------------
// Setup client stack, eip, and VG_(client_arg[cv])
// p: load_client() [for 'info']
// p: fix_environment() [for 'env']
//--------------------------------------------------------------
iicii.clstack_end = info.stack_end;
iifii.clstack_max_size = info.stack_end - info.stack_start + 1;
iifii.initial_client_SP =
setup_client_stack( iicii.argv - 1, env, &info,
iicii.clstack_end, iifii.clstack_max_size,
vex_archinfo );
VG_(free)(env);
VG_(debugLog)(2, "initimg",
"Client info: "
"initial_IP=%p initial_SP=%p stack=[%p..%p]\n",
(void*)(iifii.initial_client_IP),
(void*)(iifii.initial_client_SP),
(void*)(info.stack_start),
(void*)(info.stack_end));
// Tell aspacem about commpage, etc
record_system_memory();
VG_(free)(info.interp_name); info.interp_name = NULL;
VG_(free)(info.interp_args); info.interp_args = NULL;
return iifii;
}
/*====================================================================*/
/*=== TOP-LEVEL: VG_(ii_finalise_image) ===*/
/*====================================================================*/
/* Just before starting the client, we may need to make final
adjustments to its initial image. Also we need to set up the VEX
guest state for thread 1 (the root thread) and copy in essential
starting values. This is handed the IIFinaliseImageInfo created by
VG_(ii_create_image).
*/
void VG_(ii_finalise_image)( IIFinaliseImageInfo iifii )
{
ThreadArchState* arch = &VG_(threads)[1].arch;
/* GrP fixme doesn't handle all registers from LC_THREAD or LC_UNIXTHREAD */
# if defined(VGP_x86_darwin)
vg_assert(0 == sizeof(VexGuestX86State) % 16);
/* Zero out the initial state, and set up the simulated FPU in a
sane way. */
LibVEX_GuestX86_initialise(&arch->vex);
/* Zero out the shadow areas. */
VG_(memset)(&arch->vex_shadow1, 0, sizeof(VexGuestX86State));
VG_(memset)(&arch->vex_shadow2, 0, sizeof(VexGuestX86State));
/* Put essential stuff into the new state. */
arch->vex.guest_ESP = iifii.initial_client_SP;
arch->vex.guest_EIP = iifii.initial_client_IP;
# elif defined(VGP_amd64_darwin)
vg_assert(0 == sizeof(VexGuestAMD64State) % 16);
/* Zero out the initial state, and set up the simulated FPU in a
sane way. */
LibVEX_GuestAMD64_initialise(&arch->vex);
/* Zero out the shadow areas. */
VG_(memset)(&arch->vex_shadow1, 0, sizeof(VexGuestAMD64State));
VG_(memset)(&arch->vex_shadow2, 0, sizeof(VexGuestAMD64State));
/* Put essential stuff into the new state. */
arch->vex.guest_RSP = iifii.initial_client_SP;
arch->vex.guest_RIP = iifii.initial_client_IP;
# else
# error Unknown platform
# endif
/* Tell the tool that we just wrote to the registers. */
VG_TRACK( post_reg_write, Vg_CoreStartup, /*tid*/1, /*offset*/0,
sizeof(VexGuestArchState));
}
#endif // defined(VGO_darwin)
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/