b029628be2
Richard Henderson <richard.henderson@linaro.org> writes[1]: > There was a Spec benchmark (I forget which) which was memory bound and ran > twice as fast with 32-bit pointers. > > I copied the idea from DEC to the ELF abi, but never did all the other work > to allow the toolchain to take advantage. > > Amusingly, a later Spec changed the benchmark data sets to not fit into a > 32-bit address space, specifically because of this. > > I expect one could delete the ELF bit and personality and no one would > notice. Not even the 10 remaining Alpha users. In [2] it was pointed out that parts of setarch weren't working properly on alpha because it has it's own SET_PERSONALITY implementation. In the discussion that followed Richard Henderson pointed out that the 32bit pointer support for alpha was never completed. Fix this by removing alpha's 32bit pointer support. As a bit of paranoia refuse to execute any alpha binaries that have the EF_ALPHA_32BIT flag set. Just in case someone somewhere has binaries that try to use alpha's 32bit pointer support. Link: https://lkml.kernel.org/r/CAFXwXrkgu=4Qn-v1PjnOR4SG0oUb9LSa0g6QXpBq4ttm52pJOQ@mail.gmail.com [1] Link: https://lkml.kernel.org/r/20250103140148.370368-1-glaubitz@physik.fu-berlin.de [2] Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Link: https://lore.kernel.org/r/87y0zfs26i.fsf_-_@email.froward.int.ebiederm.org Signed-off-by: Kees Cook <kees@kernel.org>
154 lines
5.4 KiB
C
154 lines
5.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_ALPHA_ELF_H
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#define __ASM_ALPHA_ELF_H
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#include <asm/auxvec.h>
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#include <asm/special_insns.h>
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/* Special values for the st_other field in the symbol table. */
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#define STO_ALPHA_NOPV 0x80
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#define STO_ALPHA_STD_GPLOAD 0x88
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/*
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* Alpha ELF relocation types
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*/
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#define R_ALPHA_NONE 0 /* No reloc */
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#define R_ALPHA_REFLONG 1 /* Direct 32 bit */
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#define R_ALPHA_REFQUAD 2 /* Direct 64 bit */
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#define R_ALPHA_GPREL32 3 /* GP relative 32 bit */
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#define R_ALPHA_LITERAL 4 /* GP relative 16 bit w/optimization */
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#define R_ALPHA_LITUSE 5 /* Optimization hint for LITERAL */
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#define R_ALPHA_GPDISP 6 /* Add displacement to GP */
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#define R_ALPHA_BRADDR 7 /* PC+4 relative 23 bit shifted */
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#define R_ALPHA_HINT 8 /* PC+4 relative 16 bit shifted */
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#define R_ALPHA_SREL16 9 /* PC relative 16 bit */
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#define R_ALPHA_SREL32 10 /* PC relative 32 bit */
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#define R_ALPHA_SREL64 11 /* PC relative 64 bit */
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#define R_ALPHA_GPRELHIGH 17 /* GP relative 32 bit, high 16 bits */
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#define R_ALPHA_GPRELLOW 18 /* GP relative 32 bit, low 16 bits */
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#define R_ALPHA_GPREL16 19 /* GP relative 16 bit */
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#define R_ALPHA_COPY 24 /* Copy symbol at runtime */
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#define R_ALPHA_GLOB_DAT 25 /* Create GOT entry */
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#define R_ALPHA_JMP_SLOT 26 /* Create PLT entry */
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#define R_ALPHA_RELATIVE 27 /* Adjust by program base */
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#define R_ALPHA_BRSGP 28
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#define R_ALPHA_TLSGD 29
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#define R_ALPHA_TLS_LDM 30
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#define R_ALPHA_DTPMOD64 31
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#define R_ALPHA_GOTDTPREL 32
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#define R_ALPHA_DTPREL64 33
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#define R_ALPHA_DTPRELHI 34
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#define R_ALPHA_DTPRELLO 35
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#define R_ALPHA_DTPREL16 36
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#define R_ALPHA_GOTTPREL 37
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#define R_ALPHA_TPREL64 38
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#define R_ALPHA_TPRELHI 39
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#define R_ALPHA_TPRELLO 40
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#define R_ALPHA_TPREL16 41
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#define SHF_ALPHA_GPREL 0x10000000
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/* Legal values for e_flags field of Elf64_Ehdr. */
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#define EF_ALPHA_32BIT 1 /* All addresses are below 2GB */
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/*
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* ELF register definitions..
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*/
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/*
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* The OSF/1 version of <sys/procfs.h> makes gregset_t 46 entries long.
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* I have no idea why that is so. For now, we just leave it at 33
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* (32 general regs + processor status word).
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*/
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#define ELF_NGREG 33
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#define ELF_NFPREG 32
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typedef unsigned long elf_greg_t;
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typedef elf_greg_t elf_gregset_t[ELF_NGREG];
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typedef double elf_fpreg_t;
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typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
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/*
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* This is used to ensure we don't load something for the wrong architecture.
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*/
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#define elf_check_arch(x) (((x)->e_machine == EM_ALPHA) && !((x)->e_flags & EF_ALPHA_32BIT))
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/*
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* These are used to set parameters in the core dumps.
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*/
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#define ELF_CLASS ELFCLASS64
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#define ELF_DATA ELFDATA2LSB
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#define ELF_ARCH EM_ALPHA
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#define ELF_EXEC_PAGESIZE 8192
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/* This is the location that an ET_DYN program is loaded if exec'ed. Typical
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use of this is to invoke "./ld.so someprog" to test out a new version of
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the loader. We need to make sure that it is out of the way of the program
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that it will "exec", and that there is sufficient room for the brk. */
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#define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000)
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/* $0 is set by ld.so to a pointer to a function which might be
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registered using atexit. This provides a mean for the dynamic
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linker to call DT_FINI functions for shared libraries that have
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been loaded before the code runs.
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So that we can use the same startup file with static executables,
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we start programs with a value of 0 to indicate that there is no
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such function. */
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#define ELF_PLAT_INIT(_r, load_addr) _r->r0 = 0
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/* The registers are laid out in pt_regs for PAL and syscall
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convenience. Re-order them for the linear elf_gregset_t. */
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struct pt_regs;
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struct thread_info;
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struct task_struct;
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extern void dump_elf_thread(elf_greg_t *dest, struct pt_regs *pt,
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struct thread_info *ti);
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#define ELF_CORE_COPY_REGS(DEST, REGS) \
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dump_elf_thread(DEST, REGS, current_thread_info());
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/* Similar, but for a thread other than current. */
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extern int dump_elf_task(elf_greg_t *dest, struct task_struct *task);
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#define ELF_CORE_COPY_TASK_REGS(TASK, DEST) \
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dump_elf_task(*(DEST), TASK)
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/* This yields a mask that user programs can use to figure out what
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instruction set this CPU supports. This is trivial on Alpha,
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but not so on other machines. */
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#define ELF_HWCAP (~amask(-1))
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/* This yields a string that ld.so will use to load implementation
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specific libraries for optimization. This is more specific in
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intent than poking at uname or /proc/cpuinfo. */
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#define ELF_PLATFORM \
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({ \
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enum implver_enum i_ = implver(); \
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( i_ == IMPLVER_EV5 ? "ev56" \
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: amask (AMASK_CIX) ? "ev6" : "ev67"); \
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})
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extern int alpha_l1i_cacheshape;
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extern int alpha_l1d_cacheshape;
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extern int alpha_l2_cacheshape;
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extern int alpha_l3_cacheshape;
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/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
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#define ARCH_DLINFO \
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do { \
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NEW_AUX_ENT(AT_L1I_CACHESHAPE, alpha_l1i_cacheshape); \
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NEW_AUX_ENT(AT_L1D_CACHESHAPE, alpha_l1d_cacheshape); \
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NEW_AUX_ENT(AT_L2_CACHESHAPE, alpha_l2_cacheshape); \
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NEW_AUX_ENT(AT_L3_CACHESHAPE, alpha_l3_cacheshape); \
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} while (0)
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#endif /* __ASM_ALPHA_ELF_H */
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