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Fill out fake preload structure to let userland tools like pmc(3) know

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about kernel module base address and actual size
This commit is contained in:
Oleksandr Tymoshenko 2012-03-15 05:29:51 +00:00
parent 199aa9756b
commit fba09d4c08
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=232998
2 changed files with 51 additions and 1 deletions
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2
sys/conf/Makefile.mips
View File

@ -44,7 +44,7 @@ MKMODULESENV+= MACHINE=${MACHINE} MACHINE_ARCH=${MACHINE_ARCH}
# We default to the MIPS32 ISA, if none specified in the
# kernel configuration file.
ARCH_FLAGS?=-march=mips32
EXTRA_FLAGS=-fno-pic -mno-abicalls -G0
EXTRA_FLAGS=-fno-pic -mno-abicalls -G0 -DKERNLOADADDR=${KERNLOADADDR}
HACK_EXTRA_FLAGS=-shared

50
sys/mips/mips/machdep.c
View File

@ -380,6 +380,56 @@ mips_vector_init(void)
void
mips_postboot_fixup(void)
{
static char fake_preload[256];
caddr_t preload_ptr = (caddr_t)&fake_preload[0];
size_t size = 0;
/*
* Provide kernel module file information
*/
*(uint32_t*)(preload_ptr + size) = MODINFO_NAME;
size += sizeof(uint32_t);
*(uint32_t*)(preload_ptr + size) = strlen("kernel") + 1;
size += sizeof(uint32_t);
strcpy((char*)(preload_ptr + size), "kernel");
size += strlen("kernel") + 1;
size = roundup(size, sizeof(u_long));
*(uint32_t*)(preload_ptr + size) = MODINFO_TYPE;
size += sizeof(uint32_t);
*(uint32_t*)(preload_ptr + size) = strlen("elf kernel") + 1;
size += sizeof(uint32_t);
strcpy((char*)(preload_ptr + size), "elf kernel");
size += strlen("elf kernel") + 1;
size = roundup(size, sizeof(u_long));
*(uint32_t*)(preload_ptr + size) = MODINFO_ADDR;
size += sizeof(uint32_t);
*(uint32_t*)(preload_ptr + size) = sizeof(vm_offset_t);
size += sizeof(uint32_t);
*(vm_offset_t*)(preload_ptr + size) = KERNLOADADDR;
size += sizeof(vm_offset_t);
size = roundup(size, sizeof(u_long));
*(uint32_t*)(preload_ptr + size) = MODINFO_SIZE;
size += sizeof(uint32_t);
*(uint32_t*)(preload_ptr + size) = sizeof(size_t);
size += sizeof(uint32_t);
*(vm_offset_t*)(preload_ptr + size) = (size_t)&end - KERNLOADADDR;
size = roundup(size, sizeof(u_long));
size += sizeof(size_t);
/* End marker */
*(uint32_t*)(preload_ptr + size) = 0;
size += sizeof(uint32_t);
*(uint32_t*)(preload_ptr + size) = 0;
size += sizeof(uint32_t);
KASSERT((size < sizeof(fake_preload)),
("fake preload size is more thenallocated"));
preload_metadata = (void *)fake_preload;
#ifdef DDB
Elf_Size *trampoline_data = (Elf_Size*)kernel_kseg0_end;
Elf_Size symtabsize = 0;