feat: dynamic boot medium probing and mounting

[lunaix-os.git] / lunaix-os / kernel / loader / elf.c

diff --git a/lunaix-os/kernel/loader/elf.c b/lunaix-os/kernel/loader/elf.c
index c7467aa9db5b614ab4af70ab844a0a1311a508b3..f6d494759591a2c6e42c124ff387e405e1cbc9a8 100644 (file)
--- a/lunaix-os/kernel/loader/elf.c
+++ b/lunaix-os/kernel/loader/elf.c
@@ -7,32 +7,13 @@
 #include <lunaix/mm/vmm.h>
 #include <lunaix/spike.h>
 
 #include <lunaix/mm/vmm.h>
 #include <lunaix/spike.h>
 

-int
-__elf_populate_mapped(struct mm_region* region, void* pg, off_t offset)
-{
-    size_t segsz = region->flen;
-    size_t segoff = offset - region->foff;
-
-    if (segoff >= segsz) {
-        return 0;
-    }
-
-    struct v_file* file = region->mfile;
-    size_t rdlen = MIN(segsz - segoff, PG_SIZE);
-
-    if (rdlen == PG_SIZE) {
-        // This is because we want to exploit any optimization on read_page
-        return file->ops->read_page(file->inode, pg, PG_SIZE, offset);
-    } else {
-        return file->ops->read(file->inode, pg, rdlen, offset);
-    }
-}
-

 int
 elf_map_segment(struct ld_param* ldparam,
                 struct v_file* elfile,
                 struct elf32_phdr* phdr)
 {
 int
 elf_map_segment(struct ld_param* ldparam,
                 struct v_file* elfile,
                 struct elf32_phdr* phdr)
 {

+    assert(PG_ALIGNED(phdr->p_offset));
+

     int proct = 0;
     if ((phdr->p_flags & PF_R)) {
         proct |= PROT_READ;
     int proct = 0;
     if ((phdr->p_flags & PF_R)) {
         proct |= PROT_READ;


@@ -44,21 +25,19 @@ elf_map_segment(struct ld_param* ldparam,
         proct |= PROT_EXEC;
     }
 
         proct |= PROT_EXEC;
     }
 

-    struct mm_region* seg_reg;

     struct mmap_param param = { .vms_mnt = ldparam->vms_mnt,
                                 .pvms = &ldparam->proc->mm,
                                 .proct = proct,
     struct mmap_param param = { .vms_mnt = ldparam->vms_mnt,
                                 .pvms = &ldparam->proc->mm,
                                 .proct = proct,

-                                .offset = phdr->p_offset,
+                                .offset = PG_ALIGN(phdr->p_offset),

                                 .mlen = ROUNDUP(phdr->p_memsz, PG_SIZE),
                                 .mlen = ROUNDUP(phdr->p_memsz, PG_SIZE),

-                                .flen = phdr->p_filesz,
+                                .flen = phdr->p_filesz + PG_MOD(phdr->p_va),

                                 .flags = MAP_FIXED | MAP_PRIVATE,
                                 .type = REGION_TYPE_CODE };
 
                                 .flags = MAP_FIXED | MAP_PRIVATE,
                                 .type = REGION_TYPE_CODE };
 

+    struct mm_region* seg_reg;

     int status = mem_map(NULL, &seg_reg, PG_ALIGN(phdr->p_va), elfile, &param);
 
     if (!status) {
     int status = mem_map(NULL, &seg_reg, PG_ALIGN(phdr->p_va), elfile, &param);
 
     if (!status) {

-        seg_reg->init_page = __elf_populate_mapped;
-

         size_t next_addr = phdr->p_memsz + phdr->p_va;
         ldparam->info.end = MAX(ldparam->info.end, ROUNDUP(next_addr, PG_SIZE));
         ldparam->info.mem_sz += phdr->p_memsz;
         size_t next_addr = phdr->p_memsz + phdr->p_va;
         ldparam->info.end = MAX(ldparam->info.end, ROUNDUP(next_addr, PG_SIZE));
         ldparam->info.mem_sz += phdr->p_memsz;


@@ -82,7 +61,11 @@ elf_setup_mapping(struct ld_param* ldparam,
     }
 
     tbl_sz = 1 << ILOG2(tbl_sz);
     }
 
     tbl_sz = 1 << ILOG2(tbl_sz);

-    phdrs = elfile->ops->read(elfile->inode, phdrs, tbl_sz, ehdr->e_phoff);
+    status = elfile->ops->read(elfile->inode, phdrs, tbl_sz, ehdr->e_phoff);
+
+    if (status < 0) {
+        goto done;
+    }

 
     if (PG_ALIGN(phdrs[0].p_va) != USER_START) {
         status = ENOEXEC;
 
     if (PG_ALIGN(phdrs[0].p_va) != USER_START) {
         status = ENOEXEC;


@@ -122,7 +105,7 @@ elf_load(struct ld_param* ldparam, struct v_file* elfile)
     struct elf32_ehdr* ehdr = valloc(SIZE_EHDR);
     int status = elfile->ops->read(elfile->inode, ehdr, SIZE_EHDR, 0);
 
     struct elf32_ehdr* ehdr = valloc(SIZE_EHDR);
     int status = elfile->ops->read(elfile->inode, ehdr, SIZE_EHDR, 0);
 

-    if (status) {
+    if (status < 0) {

         goto done;
     }
 
         goto done;
     }