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bsd-user: add stubbed out core dump support

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Add a stubbed-out version of the bsd-user fork's core dump support. This
allows elfload.c to be almost the same between what's upstream and
what's in qemu-project upstream w/o the burden of reviewing the core
dump support.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh 2021-08-06 14:20:16 -06:00 • committed by Warner Losh
parent 25fb5d383d
commit 0475f8fac5
3 changed files with 36 additions and 2 deletions
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22
bsd-user/elfload.c
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@ -26,15 +26,17 @@
static abi_ulong target_auxents; /* Where the AUX entries are in target */
static size_t target_auxents_sz; /* Size of AUX entries including AT_NULL */
#include "target_arch_reg.h"
#include "target_os_elf.h"
#include "target_os_stack.h"
#include "target_os_thread.h"
#include "elf.h"
#include "target_os_user.h"
abi_ulong target_stksiz;
abi_ulong target_stkbas;
static int elf_core_dump(int signr, CPUArchState *env);
static inline void memcpy_fromfs(void *to, const void *from, unsigned long n)
{
memcpy(to, from, n);
@ -100,15 +102,25 @@ static void bswap_sym(struct elf_sym *sym)
bswap16s(&sym->st_shndx);
}
static void bswap_note(struct elf_note *en)
{
bswap32s(&en->n_namesz);
bswap32s(&en->n_descsz);
bswap32s(&en->n_type);
}
#else /* ! BSWAP_NEEDED */
static void bswap_ehdr(struct elfhdr *ehdr) { }
static void bswap_phdr(struct elf_phdr *phdr, int phnum) { }
static void bswap_shdr(struct elf_shdr *shdr, int shnum) { }
static void bswap_sym(struct elf_sym *sym) { }
static void bswap_note(struct elf_note *en) { }
#endif /* ! BSWAP_NEEDED */
#include "elfcore.c"
/*
* 'copy_elf_strings()' copies argument/envelope strings from user
* memory to free pages in kernel mem. These are in a format ready
@ -834,6 +846,12 @@ int load_elf_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs,
info->entry = elf_entry;
#ifdef USE_ELF_CORE_DUMP
bprm->core_dump = &elf_core_dump;
#else
bprm->core_dump = NULL;
#endif
return 0;
}