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bsd-user: pull in target_arch_thread.h update target_arch_elf.h

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Update target_arch_elf.h to remove thread_init. Move its contents to
target_arch_thread.h and rename to target_thread_init(). Update
elfload.c to call it. Create thread_os_thread.h to hold the os specific
parts of the thread and threat manipulation routines. Currently, it just
includes target_arch_thread.h. target_arch_thread.h contains the at the
moment unused target_thread_set_upcall which will be used in the future
when creating actual thread (i386 has this stubbed, but other
architectures in the bsd-user tree have real ones). FreeBSD doesn't do
AT_HWCAP, so remove that code. Linux does, and this code came from there.

These changes are all interrelated and could be brokend down, but seem
to represent a reviewable changeset since most of the change is boiler
plate.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Kyle Evans <kevans@FreeBSD.org>
This commit is contained in:
Warner Losh
2021-08-03 22:04:20 -06:00
committed by Warner Losh
parent 031fe7af8a
commit a8fe6d5d62
8 changed files with 171 additions and 85 deletions
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52
bsd-user/i386/target_arch_elf.h
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@@ -19,62 +19,16 @@
#ifndef _TARGET_ARCH_ELF_H_
#define _TARGET_ARCH_ELF_H_
#define ELF_PLATFORM get_elf_platform()
static const char *get_elf_platform(void)
{
static char elf_platform[] = "i386";
int family = object_property_get_int(OBJECT(thread_cpu), "family", NULL);
if (family > 6) {
family = 6;
}
if (family >= 3) {
elf_platform[1] = '0' + family;
}
return elf_platform;
}
#define ELF_HWCAP get_elf_hwcap()
static uint32_t get_elf_hwcap(void)
{
X86CPU *cpu = X86_CPU(thread_cpu);
return cpu->env.features[FEAT_1_EDX];
}
#define ELF_START_MMAP 0x80000000
/*
* This is used to ensure we don't load something for the wrong architecture.
*/
#define ELF_ET_DYN_LOAD_ADDR 0x01001000
#define elf_check_arch(x) (((x) == EM_386) || ((x) == EM_486))
/*
* These are used to set parameters in the core dumps.
*/
#define ELF_HWCAP 0 /* FreeBSD doesn't do AT_HWCAP{,2} on x86 */
#define ELF_CLASS ELFCLASS32
#define ELF_DATA ELFDATA2LSB
#define ELF_ARCH EM_386
static inline void init_thread(struct target_pt_regs *regs,
struct image_info *infop)
{
regs->esp = infop->start_stack;
regs->eip = infop->entry;
/*
* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
* starts %edx contains a pointer to a function which might be
* registered using `atexit'. This provides a mean for the
* dynamic linker to call DT_FINI functions for shared libraries
* that have been loaded before the code runs.
*
* A value of 0 tells we have no such handler.
*/
regs->edx = 0;
}
#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE 4096