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incubator-nuttx/binfmt/libelf/libelf_coredump.c

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/****************************************************************************
* binfmt/libelf/libelf_coredump.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/arch.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/elf.h>
#include <nuttx/binfmt/elf.h>
#include <nuttx/binfmt/binfmt.h>
#include <nuttx/sched.h>
#include <sched/sched.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifdef PAGESIZE
# define ELF_PAGESIZE PAGESIZE
#else
# define ELF_PAGESIZE 1024
#endif
#define PROGRAM_ALIGNMENT 64
#define ROUNDUP(x, y) ((x + (y - 1)) / (y)) * (y)
#define ROUNDDOWN(x ,y) (((x) / (y)) * (y))
/****************************************************************************
* Private Data
****************************************************************************/
static uint8_t g_running_regs[XCPTCONTEXT_SIZE] aligned_data(16);
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: elf_flush
*
* Description:
* Flush the out stream
*
****************************************************************************/
static int elf_flush(FAR struct elf_dumpinfo_s *cinfo)
{
return lib_stream_flush(cinfo->stream);
}
/****************************************************************************
* Name: elf_emit
*
* Description:
* Send the dump data to binfmt_outstream_s
*
****************************************************************************/
static int elf_emit(FAR struct elf_dumpinfo_s *cinfo,
FAR const void *buf, size_t len)
{
FAR const uint8_t *ptr = buf;
size_t total = len;
int ret = 0;
while (total > 0)
{
ret = lib_stream_puts(cinfo->stream, ptr, total);
if (ret < 0)
{
break;
}
total -= ret;
ptr += ret;
}
return ret < 0 ? ret : len - total;
}
/****************************************************************************
* Name: elf_emit_align
*
* Description:
* Align the filled data according to the current offset
*
****************************************************************************/
static int elf_emit_align(FAR struct elf_dumpinfo_s *cinfo)
{
off_t align = ROUNDUP(cinfo->stream->nput,
ELF_PAGESIZE) - cinfo->stream->nput;
unsigned char null[256];
off_t total = align;
off_t ret = 0;
memset(null, 0, sizeof(null));
while (total > 0)
{
ret = elf_emit(cinfo, null, total > sizeof(null) ?
sizeof(null) : total);
if (ret <= 0)
{
break;
}
total -= ret;
}
return ret < 0 ? ret : align;
}
/****************************************************************************
* Name: elf_emit_hdr
*
* Description:
* Fill the elf header
*
****************************************************************************/
static int elf_emit_hdr(FAR struct elf_dumpinfo_s *cinfo,
int segs)
{
Elf_Ehdr ehdr;
memset(&ehdr, 0, sizeof(ehdr));
memcpy(ehdr.e_ident, ELFMAG, EI_MAGIC_SIZE);
ehdr.e_ident[EI_CLASS] = ELF_CLASS;
ehdr.e_ident[EI_DATA] = ELF_DATA;
ehdr.e_ident[EI_VERSION] = EV_CURRENT;
ehdr.e_ident[EI_OSABI] = ELF_OSABI;
ehdr.e_type = ET_CORE;
ehdr.e_machine = EM_ARCH;
ehdr.e_version = EV_CURRENT;
ehdr.e_phoff = sizeof(Elf_Ehdr);
ehdr.e_flags = EF_FLAG;
ehdr.e_ehsize = sizeof(Elf_Ehdr);
ehdr.e_phentsize = sizeof(Elf_Phdr);
ehdr.e_phnum = segs;
return elf_emit(cinfo, &ehdr, sizeof(ehdr));
}
/****************************************************************************
* Name: elf_get_ntcb
*
* Description:
* Calculate the note segment size
*
****************************************************************************/
static int elf_get_ntcb(void)
{
int count = 0;
int i;
for (i = 0; i < g_npidhash; i++)
{
if (g_pidhash[i] != NULL)
{
count++;
}
}
return count;
}
/****************************************************************************
* Name: elf_get_note_size
*
* Description:
* Calculate the note segment size
*
****************************************************************************/
static int elf_get_note_size(int stksegs)
{
int total;
total = stksegs * (sizeof(Elf_Nhdr) + ROUNDUP(CONFIG_TASK_NAME_SIZE, 8) +
sizeof(elf_prstatus_t));
total += stksegs * (sizeof(Elf_Nhdr) + ROUNDUP(CONFIG_TASK_NAME_SIZE, 8) +
sizeof(elf_prpsinfo_t));
return total;
}
/****************************************************************************
* Name: elf_emit_tcb_note
*
* Description:
* Fill the note segment information from tcb
*
****************************************************************************/
static void elf_emit_tcb_note(FAR struct elf_dumpinfo_s *cinfo,
FAR struct tcb_s *tcb)
{
char name[ROUNDUP(CONFIG_TASK_NAME_SIZE, 8)];
elf_prstatus_t status;
elf_prpsinfo_t info;
FAR uintptr_t *regs;
Elf_Nhdr nhdr;
int i;
memset(&info, 0x0, sizeof(info));
memset(&status, 0x0, sizeof(status));
/* Fill Process info */
nhdr.n_namesz = sizeof(name);
nhdr.n_descsz = sizeof(info);
nhdr.n_type = NT_PRPSINFO;
elf_emit(cinfo, &nhdr, sizeof(nhdr));
strlcpy(name, tcb->name, sizeof(name));
elf_emit(cinfo, name, sizeof(name));
info.pr_pid = tcb->pid;
strlcpy(info.pr_fname, tcb->name, sizeof(info.pr_fname));
elf_emit(cinfo, &info, sizeof(info));
/* Fill Process status */
nhdr.n_descsz = sizeof(status);
nhdr.n_type = NT_PRSTATUS;
elf_emit(cinfo, &nhdr, sizeof(nhdr));
elf_emit(cinfo, name, sizeof(name));
status.pr_pid = tcb->pid;
if (running_task() == tcb)
{
if (up_interrupt_context())
{
regs = (FAR uintptr_t *)up_current_regs();
}
else
{
up_saveusercontext(g_running_regs);
regs = (FAR uintptr_t *)g_running_regs;
}
}
else
{
regs = (FAR uintptr_t *)tcb->xcp.regs;
}
if (regs != NULL)
{
for (i = 0; i < nitems(status.pr_regs); i++)
{
if (g_tcbinfo.reg_off.p[i] == UINT16_MAX)
{
continue;
}
else
{
status.pr_regs[i] = *(FAR uintptr_t *)
((FAR uint8_t *)regs + g_tcbinfo.reg_off.p[i]);
}
}
}
elf_emit(cinfo, &status, sizeof(status));
}
/****************************************************************************
* Name: elf_emit_note
*
* Description:
* Fill the note segment information
*
****************************************************************************/
static void elf_emit_note(FAR struct elf_dumpinfo_s *cinfo)
{
int i;
if (cinfo->pid == INVALID_PROCESS_ID)
{
for (i = 0; i < g_npidhash; i++)
{
if (g_pidhash[i] != NULL)
{
elf_emit_tcb_note(cinfo, g_pidhash[i]);
}
}
}
else
{
elf_emit_tcb_note(cinfo, nxsched_get_tcb(cinfo->pid));
}
}
/****************************************************************************
* Name: elf_emit_tcb_stack
*
* Description:
* Fill the task stack information from tcb
*
****************************************************************************/
static void elf_emit_tcb_stack(FAR struct elf_dumpinfo_s *cinfo,
FAR struct tcb_s *tcb)
{
uintptr_t buf = 0;
uintptr_t sp;
size_t len;
if (running_task() != tcb)
{
sp = up_getusrsp(tcb->xcp.regs);
if (sp > (uintptr_t)tcb->stack_base_ptr &&
sp < (uintptr_t)tcb->stack_base_ptr + tcb->adj_stack_size)
{
len = ((uintptr_t)tcb->stack_base_ptr +
tcb->adj_stack_size) - sp;
buf = sp;
}
#ifdef CONFIG_STACK_COLORATION
else
{
len = up_check_tcbstack(tcb);
buf = (uintptr_t)tcb->stack_base_ptr +
(tcb->adj_stack_size - len);
}
#endif
}
if (buf == 0)
{
buf = (uintptr_t)tcb->stack_alloc_ptr;
len = tcb->adj_stack_size +
(tcb->stack_base_ptr - tcb->stack_alloc_ptr);
}
sp = ROUNDDOWN(buf, PROGRAM_ALIGNMENT);
len = ROUNDUP(len + (buf - sp), PROGRAM_ALIGNMENT);
buf = sp;
elf_emit(cinfo, (FAR void *)buf, len);
/* Align to page */
elf_emit_align(cinfo);
}
/****************************************************************************
* Name: elf_emit_stack
*
* Description:
* Fill the task stack information
*
****************************************************************************/
static void elf_emit_stack(FAR struct elf_dumpinfo_s *cinfo)
{
int i;
if (cinfo->pid == INVALID_PROCESS_ID)
{
for (i = 0; i < g_npidhash; i++)
{
if (g_pidhash[i] != NULL)
{
elf_emit_tcb_stack(cinfo, g_pidhash[i]);
}
}
}
else
{
elf_emit_tcb_stack(cinfo, nxsched_get_tcb(cinfo->pid));
}
}
/****************************************************************************
* Name: elf_emit_memory
*
* Description:
* Fill the note segment information
*
****************************************************************************/
static void elf_emit_memory(FAR struct elf_dumpinfo_s *cinfo, int memsegs)
{
int i;
for (i = 0; i < memsegs; i++)
{
if (cinfo->regions[i].flags & PF_REGISTER)
{
FAR uintptr_t *start = (FAR uintptr_t *)cinfo->regions[i].start;
FAR uintptr_t *end = (FAR uintptr_t *)cinfo->regions[i].end;
uintptr_t buf[64];
size_t offset = 0;
while (start < end)
{
buf[offset++] = *start++;
if (offset % (sizeof(buf) / sizeof(uintptr_t)) == 0)
{
elf_emit(cinfo, buf, sizeof(buf));
offset = 0;
}
}
if (offset != 0)
{
elf_emit(cinfo, buf, offset * sizeof(uintptr_t));
}
}
else
{
elf_emit(cinfo, (FAR void *)cinfo->regions[i].start,
cinfo->regions[i].end - cinfo->regions[i].start);
}
/* Align to page */
elf_emit_align(cinfo);
}
}
/****************************************************************************
* Name: elf_emit_tcb_phdr
*
* Description:
* Fill the program segment header from tcb
*
****************************************************************************/
static void elf_emit_tcb_phdr(FAR struct elf_dumpinfo_s *cinfo,
FAR struct tcb_s *tcb,
FAR Elf_Phdr *phdr, FAR off_t *offset)
{
uintptr_t sp;
phdr->p_vaddr = 0;
if (running_task() != tcb)
{
sp = up_getusrsp(tcb->xcp.regs);
if (sp > (uintptr_t)tcb->stack_base_ptr &&
sp < (uintptr_t)tcb->stack_base_ptr + tcb->adj_stack_size)
{
phdr->p_filesz = ((uintptr_t)tcb->stack_base_ptr +
tcb->adj_stack_size) - sp;
phdr->p_vaddr = sp;
}
#ifdef CONFIG_STACK_COLORATION
else
{
phdr->p_filesz = up_check_tcbstack(tcb);
phdr->p_vaddr = (uintptr_t)tcb->stack_base_ptr +
(tcb->adj_stack_size - phdr->p_filesz);
}
#endif
}
if (phdr->p_vaddr == 0)
{
phdr->p_vaddr = (uintptr_t)tcb->stack_alloc_ptr;
phdr->p_filesz = tcb->adj_stack_size +
(tcb->stack_base_ptr - tcb->stack_alloc_ptr);
}
sp = ROUNDDOWN(phdr->p_vaddr, PROGRAM_ALIGNMENT);
phdr->p_filesz = ROUNDUP(phdr->p_filesz +
(phdr->p_vaddr - sp), PROGRAM_ALIGNMENT);
phdr->p_vaddr = sp;
phdr->p_type = PT_LOAD;
phdr->p_offset = ROUNDUP(*offset, ELF_PAGESIZE);
phdr->p_paddr = phdr->p_vaddr;
phdr->p_memsz = phdr->p_filesz;
phdr->p_flags = PF_X | PF_W | PF_R;
phdr->p_align = ELF_PAGESIZE;
*offset += ROUNDUP(phdr->p_memsz, ELF_PAGESIZE);
elf_emit(cinfo, phdr, sizeof(*phdr));
}
/****************************************************************************
* Name: elf_emit_phdr
*
* Description:
* Fill the program segment header
*
****************************************************************************/
static void elf_emit_phdr(FAR struct elf_dumpinfo_s *cinfo,
int stksegs, int memsegs)
{
off_t offset = cinfo->stream->nput +
(stksegs + memsegs + 1) * sizeof(Elf_Phdr);
Elf_Phdr phdr;
int i;
memset(&phdr, 0, sizeof(Elf_Phdr));
phdr.p_type = PT_NOTE;
phdr.p_offset = offset;
phdr.p_filesz = elf_get_note_size(stksegs);
offset += phdr.p_filesz;
elf_emit(cinfo, &phdr, sizeof(phdr));
if (cinfo->pid == INVALID_PROCESS_ID)
{
for (i = 0; i < g_npidhash; i++)
{
if (g_pidhash[i] != NULL)
{
elf_emit_tcb_phdr(cinfo, g_pidhash[i], &phdr, &offset);
}
}
}
else
{
elf_emit_tcb_phdr(cinfo, nxsched_get_tcb(cinfo->pid),
&phdr, &offset);
}
/* Write program headers for segments dump */
for (i = 0; i < memsegs; i++)
{
phdr.p_type = PT_LOAD;
phdr.p_offset = ROUNDUP(offset, ELF_PAGESIZE);
phdr.p_vaddr = cinfo->regions[i].start;
phdr.p_paddr = phdr.p_vaddr;
phdr.p_filesz = cinfo->regions[i].end - cinfo->regions[i].start;
phdr.p_memsz = phdr.p_filesz;
phdr.p_flags = cinfo->regions[i].flags;
phdr.p_align = ELF_PAGESIZE;
offset += ROUNDUP(phdr.p_memsz, ELF_PAGESIZE);
elf_emit(cinfo, &phdr, sizeof(phdr));
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: elf_coredump
*
* Description:
* Generat the core dump stream as ELF structure.
*
* Input Parameters:
* dumpinfo - elf coredump informations
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int elf_coredump(FAR struct elf_dumpinfo_s *cinfo)
{
irqstate_t flags;
int memsegs = 0;
int stksegs;
flags = enter_critical_section();
if (cinfo->pid != INVALID_PROCESS_ID)
{
if (nxsched_get_tcb(cinfo->pid) == NULL)
{
leave_critical_section(flags);
return -EINVAL;
}
stksegs = 1;
}
else
{
stksegs = elf_get_ntcb();
}
/* Check the memory region */
if (cinfo->regions != NULL)
{
for (; cinfo->regions[memsegs].start <
cinfo->regions[memsegs].end; memsegs++);
}
/* Fill notes section */
elf_emit_hdr(cinfo, stksegs + memsegs + 1);
/* Fill all the program information about the process for the
* notes. This also sets up the file header.
*/
elf_emit_phdr(cinfo, stksegs, memsegs);
/* Fill note information */
elf_emit_note(cinfo);
/* Align to page */
elf_emit_align(cinfo);
/* Dump stack */
elf_emit_stack(cinfo);
/* Dump memory segments */
if (memsegs > 0)
{
elf_emit_memory(cinfo, memsegs);
}
/* Flush the dump */
elf_flush(cinfo);
leave_critical_section(flags);
return OK;
}
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