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xtensa: add FDPIC and static PIE support for noMMU

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Define ELFOSABI_XTENSA_FDPIC and use it as an OSABI tag in the ELF
header to distinguish FDPIC ELF files from regular ELF files.
Define ELF_FDPIC_PLAT_INIT and put executable map, interpreter map and
executable dynamic section addresses into registers a4..a6.
Update start_thread macro to preserve register values in the current
register window.
Add definitions for PTRACE_GETFDPIC, PTRACE_GETFDPIC_EXEC and
PTRACE_GETFDPIC_INTERP.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2022-06-03 11:31:14 -07:00
parent ccd2d9df6e
commit e3ddb8bbe0
4 changed files with 19 additions and 1 deletions
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11
arch/xtensa/include/asm/elf.h
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@ -93,6 +93,10 @@ typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
#define elf_check_arch(x) ( ( (x)->e_machine == EM_XTENSA ) || \
( (x)->e_machine == EM_XTENSA_OLD ) )
#define ELFOSABI_XTENSA_FDPIC 65
#define elf_check_fdpic(x) ((x)->e_ident[EI_OSABI] == ELFOSABI_XTENSA_FDPIC)
#define ELF_FDPIC_CORE_EFLAGS 0
/*
* These are used to set parameters in the core dumps.
*/
@ -164,6 +168,13 @@ typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
(_r)->areg[14] = 0; (_r)->areg[15] = 0; \
} while (0)
#define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr, dynamic_addr) \
do { \
(_r)->areg[4] = _exec_map_addr; \
(_r)->areg[5] = _interp_map_addr; \
(_r)->areg[6] = dynamic_addr; \
} while (0)
typedef struct {
xtregs_opt_t opt;
xtregs_user_t user;

3
arch/xtensa/include/asm/processor.h
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@ -205,9 +205,12 @@ struct thread_struct {
#define start_thread(regs, new_pc, new_sp) \
do { \
unsigned long syscall = (regs)->syscall; \
unsigned long current_aregs[16]; \
memcpy(current_aregs, (regs)->areg, sizeof(current_aregs)); \
memset((regs), 0, sizeof(*(regs))); \
(regs)->pc = (new_pc); \
(regs)->ps = USER_PS_VALUE; \
memcpy((regs)->areg, current_aregs, sizeof(current_aregs)); \
(regs)->areg[1] = (new_sp); \
(regs)->areg[0] = 0; \
(regs)->wmask = 1; \

4
arch/xtensa/include/uapi/asm/ptrace.h
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@ -37,6 +37,10 @@
#define PTRACE_SETXTREGS 19
#define PTRACE_GETHBPREGS 20
#define PTRACE_SETHBPREGS 21
#define PTRACE_GETFDPIC 22
#define PTRACE_GETFDPIC_EXEC 0
#define PTRACE_GETFDPIC_INTERP 1
#ifndef __ASSEMBLY__

2
fs/Kconfig.binfmt
View File

@ -58,7 +58,7 @@ config ARCH_USE_GNU_PROPERTY
config BINFMT_ELF_FDPIC
bool "Kernel support for FDPIC ELF binaries"
default y if !BINFMT_ELF
depends on ARM || ((M68K || SUPERH) && !MMU)
depends on ARM || ((M68K || SUPERH || XTENSA) && !MMU)
select ELFCORE
help
ELF FDPIC binaries are based on ELF, but allow the individual load