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linux-user: Support stack-grows-up in elfload.c
HPPA is a (the) stack-grows-up target, and supporting that requires rearranging how we compute addresses while laying out the initial program stack. In addition, hppa32 requires 64-byte stack alignment so parameterize that as well. Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson
parent
429b31a205
commit
7c4ee5bcc8
@ -1231,6 +1231,14 @@ static inline void init_thread(struct target_pt_regs *regs,
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#define ELF_HWCAP 0
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#endif
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#ifndef STACK_GROWS_DOWN
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#define STACK_GROWS_DOWN 1
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#endif
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#ifndef STACK_ALIGNMENT
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#define STACK_ALIGNMENT 16
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#endif
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#ifdef TARGET_ABI32
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#undef ELF_CLASS
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#define ELF_CLASS ELFCLASS32
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@ -1374,45 +1382,78 @@ static abi_ulong copy_elf_strings(int argc, char **argv, char *scratch,
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abi_ulong p, abi_ulong stack_limit)
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{
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char *tmp;
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int len, offset;
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int len, i;
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abi_ulong top = p;
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if (!p) {
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return 0; /* bullet-proofing */
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}
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offset = ((p - 1) % TARGET_PAGE_SIZE) + 1;
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if (STACK_GROWS_DOWN) {
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int offset = ((p - 1) % TARGET_PAGE_SIZE) + 1;
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for (i = argc - 1; i >= 0; --i) {
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tmp = argv[i];
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if (!tmp) {
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fprintf(stderr, "VFS: argc is wrong");
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exit(-1);
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}
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len = strlen(tmp) + 1;
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tmp += len;
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while (argc-- > 0) {
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tmp = argv[argc];
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if (!tmp) {
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fprintf(stderr, "VFS: argc is wrong");
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exit(-1);
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}
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len = strlen(tmp) + 1;
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tmp += len;
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if (len > (p - stack_limit)) {
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return 0;
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}
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while (len) {
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int bytes_to_copy = (len > offset) ? offset : len;
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tmp -= bytes_to_copy;
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p -= bytes_to_copy;
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offset -= bytes_to_copy;
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len -= bytes_to_copy;
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if (len > (p - stack_limit)) {
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return 0;
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}
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while (len) {
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int bytes_to_copy = (len > offset) ? offset : len;
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tmp -= bytes_to_copy;
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p -= bytes_to_copy;
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offset -= bytes_to_copy;
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len -= bytes_to_copy;
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memcpy_fromfs(scratch + offset, tmp, bytes_to_copy);
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memcpy_fromfs(scratch + offset, tmp, bytes_to_copy);
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if (offset == 0) {
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memcpy_to_target(p, scratch, top - p);
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top = p;
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offset = TARGET_PAGE_SIZE;
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if (offset == 0) {
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memcpy_to_target(p, scratch, top - p);
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top = p;
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offset = TARGET_PAGE_SIZE;
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}
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}
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}
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}
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if (offset) {
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memcpy_to_target(p, scratch + offset, top - p);
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if (p != top) {
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memcpy_to_target(p, scratch + offset, top - p);
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}
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} else {
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int remaining = TARGET_PAGE_SIZE - (p % TARGET_PAGE_SIZE);
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for (i = 0; i < argc; ++i) {
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tmp = argv[i];
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if (!tmp) {
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fprintf(stderr, "VFS: argc is wrong");
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exit(-1);
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}
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len = strlen(tmp) + 1;
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if (len > (stack_limit - p)) {
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return 0;
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}
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while (len) {
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int bytes_to_copy = (len > remaining) ? remaining : len;
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memcpy_fromfs(scratch + (p - top), tmp, bytes_to_copy);
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tmp += bytes_to_copy;
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remaining -= bytes_to_copy;
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p += bytes_to_copy;
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len -= bytes_to_copy;
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if (remaining == 0) {
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memcpy_to_target(top, scratch, p - top);
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top = p;
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remaining = TARGET_PAGE_SIZE;
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}
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}
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}
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if (p != top) {
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memcpy_to_target(top, scratch, p - top);
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}
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}
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return p;
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@ -1447,11 +1488,15 @@ static abi_ulong setup_arg_pages(struct linux_binprm *bprm,
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}
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/* We reserve one extra page at the top of the stack as guard. */
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target_mprotect(error, guard, PROT_NONE);
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info->stack_limit = error + guard;
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return info->stack_limit + size - sizeof(void *);
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if (STACK_GROWS_DOWN) {
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target_mprotect(error, guard, PROT_NONE);
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info->stack_limit = error + guard;
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return info->stack_limit + size - sizeof(void *);
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} else {
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target_mprotect(error + size, guard, PROT_NONE);
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info->stack_limit = error + size;
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return error;
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}
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}
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/* Map and zero the bss. We need to explicitly zero any fractional pages
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@ -1529,7 +1574,7 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
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struct image_info *interp_info)
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{
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abi_ulong sp;
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abi_ulong sp_auxv;
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abi_ulong u_argc, u_argv, u_envp, u_auxv;
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int size;
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int i;
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abi_ulong u_rand_bytes;
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@ -1558,10 +1603,25 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
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k_platform = ELF_PLATFORM;
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if (k_platform) {
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size_t len = strlen(k_platform) + 1;
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sp -= (len + n - 1) & ~(n - 1);
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u_platform = sp;
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/* FIXME - check return value of memcpy_to_target() for failure */
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memcpy_to_target(sp, k_platform, len);
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if (STACK_GROWS_DOWN) {
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sp -= (len + n - 1) & ~(n - 1);
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u_platform = sp;
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/* FIXME - check return value of memcpy_to_target() for failure */
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memcpy_to_target(sp, k_platform, len);
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} else {
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memcpy_to_target(sp, k_platform, len);
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u_platform = sp;
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sp += len + 1;
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}
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}
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/* Provide 16 byte alignment for the PRNG, and basic alignment for
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* the argv and envp pointers.
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*/
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if (STACK_GROWS_DOWN) {
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sp = QEMU_ALIGN_DOWN(sp, 16);
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} else {
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sp = QEMU_ALIGN_UP(sp, 16);
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}
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/*
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@ -1571,15 +1631,17 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
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for (i = 0; i < 16; i++) {
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k_rand_bytes[i] = rand();
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}
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sp -= 16;
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u_rand_bytes = sp;
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/* FIXME - check return value of memcpy_to_target() for failure */
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memcpy_to_target(sp, k_rand_bytes, 16);
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if (STACK_GROWS_DOWN) {
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sp -= 16;
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u_rand_bytes = sp;
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/* FIXME - check return value of memcpy_to_target() for failure */
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memcpy_to_target(sp, k_rand_bytes, 16);
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} else {
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memcpy_to_target(sp, k_rand_bytes, 16);
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u_rand_bytes = sp;
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sp += 16;
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}
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/*
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* Force 16 byte _final_ alignment here for generality.
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*/
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sp = sp &~ (abi_ulong)15;
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size = (DLINFO_ITEMS + 1) * 2;
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if (k_platform)
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size += 2;
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@ -1592,20 +1654,31 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
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size += envc + argc + 2;
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size += 1; /* argc itself */
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size *= n;
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if (size & 15)
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sp -= 16 - (size & 15);
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/* Allocate space and finalize stack alignment for entry now. */
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if (STACK_GROWS_DOWN) {
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u_argc = QEMU_ALIGN_DOWN(sp - size, STACK_ALIGNMENT);
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sp = u_argc;
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} else {
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u_argc = sp;
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sp = QEMU_ALIGN_UP(sp + size, STACK_ALIGNMENT);
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}
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u_argv = u_argc + n;
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u_envp = u_argv + (argc + 1) * n;
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u_auxv = u_envp + (envc + 1) * n;
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info->saved_auxv = u_auxv;
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info->arg_start = u_argv;
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info->arg_end = u_argv + argc * n;
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/* This is correct because Linux defines
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* elf_addr_t as Elf32_Off / Elf64_Off
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*/
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#define NEW_AUX_ENT(id, val) do { \
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sp -= n; put_user_ual(val, sp); \
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sp -= n; put_user_ual(id, sp); \
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put_user_ual(id, u_auxv); u_auxv += n; \
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put_user_ual(val, u_auxv); u_auxv += n; \
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} while(0)
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sp_auxv = sp;
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NEW_AUX_ENT (AT_NULL, 0);
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/* There must be exactly DLINFO_ITEMS entries here. */
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NEW_AUX_ENT(AT_PHDR, (abi_ulong)(info->load_addr + exec->e_phoff));
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NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr)));
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@ -1626,8 +1699,9 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
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NEW_AUX_ENT(AT_HWCAP2, (abi_ulong) ELF_HWCAP2);
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#endif
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if (k_platform)
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if (u_platform) {
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NEW_AUX_ENT(AT_PLATFORM, u_platform);
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}
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#ifdef ARCH_DLINFO
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/*
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* ARCH_DLINFO must come last so platform specific code can enforce
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@ -1635,14 +1709,29 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
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*/
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ARCH_DLINFO;
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#endif
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NEW_AUX_ENT (AT_NULL, 0);
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#undef NEW_AUX_ENT
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info->saved_auxv = sp;
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info->auxv_len = sp_auxv - sp;
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info->auxv_len = u_argv - info->saved_auxv;
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put_user_ual(argc, u_argc);
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p = info->arg_strings;
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for (i = 0; i < argc; ++i) {
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put_user_ual(p, u_argv);
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u_argv += n;
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p += target_strlen(p) + 1;
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}
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put_user_ual(0, u_argv);
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p = info->env_strings;
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for (i = 0; i < envc; ++i) {
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put_user_ual(p, u_envp);
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u_envp += n;
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p += target_strlen(p) + 1;
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}
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put_user_ual(0, u_envp);
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sp = loader_build_argptr(envc, argc, sp, p, 0);
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/* Check the right amount of stack was allocated for auxvec, envp & argv. */
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assert(sp_auxv - sp == size);
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return sp;
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}
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@ -2213,12 +2302,28 @@ int load_elf_binary(struct linux_binprm *bprm, struct image_info *info)
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bprm->p = setup_arg_pages(bprm, info);
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scratch = g_new0(char, TARGET_PAGE_SIZE);
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bprm->p = copy_elf_strings(1, &bprm->filename, scratch,
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bprm->p, info->stack_limit);
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bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch,
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bprm->p, info->stack_limit);
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bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch,
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bprm->p, info->stack_limit);
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if (STACK_GROWS_DOWN) {
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bprm->p = copy_elf_strings(1, &bprm->filename, scratch,
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bprm->p, info->stack_limit);
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info->file_string = bprm->p;
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bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch,
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bprm->p, info->stack_limit);
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info->env_strings = bprm->p;
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bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch,
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bprm->p, info->stack_limit);
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info->arg_strings = bprm->p;
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} else {
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info->arg_strings = bprm->p;
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bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch,
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bprm->p, info->stack_limit);
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info->env_strings = bprm->p;
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bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch,
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bprm->p, info->stack_limit);
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info->file_string = bprm->p;
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bprm->p = copy_elf_strings(1, &bprm->filename, scratch,
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bprm->p, info->stack_limit);
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}
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g_free(scratch);
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if (!bprm->p) {
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@ -4179,15 +4179,16 @@ int main(int argc, char **argv, char **envp)
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qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
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qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code);
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qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n",
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info->start_code);
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qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n",
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info->start_data);
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qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n", info->start_code);
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qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n", info->start_data);
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qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data);
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qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n",
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info->start_stack);
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qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", info->start_stack);
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qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk);
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qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry);
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qemu_log("argv_start 0x" TARGET_ABI_FMT_lx "\n", info->arg_start);
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qemu_log("env_start 0x" TARGET_ABI_FMT_lx "\n",
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info->arg_end + (abi_ulong)sizeof(abi_ulong));
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qemu_log("auxv_start 0x" TARGET_ABI_FMT_lx "\n", info->saved_auxv);
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}
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target_set_brk(info->brk);
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@ -48,6 +48,9 @@ struct image_info {
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abi_ulong auxv_len;
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abi_ulong arg_start;
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abi_ulong arg_end;
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abi_ulong arg_strings;
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abi_ulong env_strings;
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abi_ulong file_string;
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uint32_t elf_flags;
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int personality;
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#ifdef CONFIG_USE_FDPIC
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