https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192324
--- Comment #3 from Matt Smith <mgsm...@netgate.com> ---
I attempted to debug it a little further. I added debugging statements around
the code where the last messages get printed:
Index: sys/boot/amd64/efi/copy.c
===================================================================
--- sys/boot/amd64/efi/copy.c (revision 272035)
+++ sys/boot/amd64/efi/copy.c (working copy)
@@ -91,6 +91,7 @@
void
x86_efi_copy_finish(void)
{
+ printf("BEGIN %s\n", __func__);
uint64_t *src, *dst, *last;
src = (uint64_t *)staging;
@@ -99,4 +100,5 @@
while (src < last)
*dst++ = *src++;
+ printf("END %s\n", __func__);
}
Index: sys/boot/amd64/efi/elf64_freebsd.c
===================================================================
--- sys/boot/amd64/efi/elf64_freebsd.c (revision 272035)
+++ sys/boot/amd64/efi/elf64_freebsd.c (working copy)
@@ -167,8 +167,10 @@
err = bi_load(fp->f_args, &modulep, &kernend);
if (err != 0)
return(err);
+ printf("after bi_load\n");
status = BS->ExitBootServices(IH, x86_efi_mapkey);
+ printf("after ExitBootServices\n");
if (EFI_ERROR(status)) {
printf("%s: ExitBootServices() returned 0x%lx\n", __func__,
(long)status);
@@ -176,9 +178,13 @@
}
dev_cleanup();
+ printf("after dev_cleanup\n");
+ printf("kernend is %u, modulep is %u, PT4 is %u, ehdr->e_entry is %u\n",
+ kernend, modulep, PT4, ehdr->e_entry);
trampoline(trampstack, x86_efi_copy_finish, kernend, modulep, PT4,
ehdr->e_entry);
+ printf("after trampoline\n");
panic("exec returned");
}
Here's the output:
Loading /boot/defaults/loader.conf
/boot/kernel/kernel text=0xfd1f00 data=0x12a530+0x608630
syms=[0x8+0x142c80+0x8+0x15dc80]
Hit [Enter] to boot immediately, or any other key for command prompt.
Type '?' for a list of commands, 'help' for more detailed help.
OK set kern.vty=vt
OK set comconsole_speed=115200
OK set console=comconsole
OK set hw.textmode=1
OK boot -v
Booting...
Start @ 0xffffffff802dd000 ...
EFI framebuffer information:
addr, size 0x80000000, 0x7e9000
dimensions 1920 x 1080
stride 1920
masks 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000
after bi_load
after ExitBootServices
after dev_cleanup
kernend is 31100928, modulep is 31092736, PT4 is 1073725440, ehdr->e_entry is
2150486016
BEGIN x86_efi_copy_finish
END x86_efi_copy_finish
After that, there is no further output. So the trampoline call is invoked and
runs at least to the point where it invokes x68_efi_copy_finish. I'm not too
familiar with assembly code & hardware registers so I can't tell anything
beyond that.
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