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linux-user: ARM-FDPIC: Add support of FDPIC for ARM.

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Add FDPIC info into image_info structure since interpreter info is on
stack and needs to be saved to be accessed later on.

Co-Authored-By:  Mickaël Guêné <mickael.guene@st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20180430080404.7323-4-christophe.lyon@st.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Christophe Lyon 2018-04-30 10:03:43 +02:00 committed by Laurent Vivier
parent cf58affecc
commit 3cb10cfafd
2 changed files with 38 additions and 0 deletions
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29
linux-user/elfload.c
View file

@ -78,6 +78,11 @@ enum {
*/
#define personality(pers) (pers & PER_MASK)
int info_is_fdpic(struct image_info *info)
{
return info->personality == PER_LINUX_FDPIC;
}
/* this flag is uneffective under linux too, should be deleted */
#ifndef MAP_DENYWRITE
#define MAP_DENYWRITE 0
@ -287,6 +292,25 @@ static inline void init_thread(struct target_pt_regs *regs,
/* For uClinux PIC binaries. */
/* XXX: Linux does this only on ARM with no MMU (do we care ?) */
regs->uregs[10] = infop->start_data;
/* Support ARM FDPIC. */
if (info_is_fdpic(infop)) {
/* As described in the ABI document, r7 points to the loadmap info
* prepared by the kernel. If an interpreter is needed, r8 points
* to the interpreter loadmap and r9 points to the interpreter
* PT_DYNAMIC info. If no interpreter is needed, r8 is zero, and
* r9 points to the main program PT_DYNAMIC info.
*/
regs->uregs[7] = infop->loadmap_addr;
if (infop->interpreter_loadmap_addr) {
/* Executable is dynamically loaded. */
regs->uregs[8] = infop->interpreter_loadmap_addr;
regs->uregs[9] = infop->interpreter_pt_dynamic_addr;
} else {
regs->uregs[8] = 0;
regs->uregs[9] = infop->pt_dynamic_addr;
}
}
}
#define ELF_NREG 18
@ -1745,6 +1769,11 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
if (interp_info) {
interp_info->other_info = info;
sp = loader_build_fdpic_loadmap(interp_info, sp);
info->interpreter_loadmap_addr = interp_info->loadmap_addr;
info->interpreter_pt_dynamic_addr = interp_info->pt_dynamic_addr;
} else {
info->interpreter_loadmap_addr = 0;
info->interpreter_pt_dynamic_addr = 0;
}
}

9
linux-user/qemu.h
View file

@ -57,6 +57,8 @@ struct image_info {
uint16_t nsegs;
void *loadsegs;
abi_ulong pt_dynamic_addr;
abi_ulong interpreter_loadmap_addr;
abi_ulong interpreter_pt_dynamic_addr;
struct image_info *other_info;
};
@ -183,6 +185,13 @@ int loader_exec(int fdexec, const char *filename, char **argv, char **envp,
struct target_pt_regs * regs, struct image_info *infop,
struct linux_binprm *);
/* Returns true if the image uses the FDPIC ABI. If this is the case,
* we have to provide some information (loadmap, pt_dynamic_info) such
* that the program can be relocated adequately. This is also useful
* when handling signals.
*/
int info_is_fdpic(struct image_info *info);
uint32_t get_elf_eflags(int fd);
int load_elf_binary(struct linux_binprm *bprm, struct image_info *info);
int load_flt_binary(struct linux_binprm *bprm, struct image_info *info);