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libpayload: Add x86_64 (64-bit) support

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This patch introduces x86_64 (64-bit) support to the payload, building
upon the existing x86 (32-bit) architecture. Files necessary for 64-bit
compilation are now guarded by the `CONFIG_LP_ARCH_X86_64` Kconfig
option.

BUG=b:242829490
TEST=Able to verify all valid combinations between coreboot and
payload with this patch.

Payload Entry Point Behavior with below code.

+----------------+--------------------+----------------------------+
| LP_ARCH_X86_64 | Payload Entry Mode | Description                |
+----------------+--------------------+----------------------------+
| No             | 32-bit             | Direct protected mode init |
+----------------+--------------------+----------------------------+
| Yes            | 32-bit             | Protected to long mode     |
+----------------+--------------------+----------------------------+
| Yes            | 64-bit             | Long mode initialization   |
+----------------+--------------------+----------------------------+

Change-Id: I69fda47bedf1a14807b1515c4aed6e3a1d5b8585
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81968
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Subrata Banik
2024-05-18 12:26:40 +00:00
parent 4244527d8c
commit afa39105d8
18 changed files with 686 additions and 58 deletions
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18
payloads/libpayload/arch/x86/gdb.c
View File

@ -15,6 +15,7 @@
#include <exception.h>
#include <gdb.h>
#include <libpayload.h>
#include <stddef.h>
static const u8 type_to_signal[] = {
[EXC_DE] = GDB_SIGFPE,
@ -53,12 +54,15 @@ void gdb_arch_init(void)
void gdb_arch_enter(void)
{
u32 *esp;
asm volatile ("mov %%esp, %0" : "=r"(esp) );
u8 *stack_pointer;
#if CONFIG(LP_ARCH_X86_64)
asm volatile ("movq %%rsp, %0" : "=r"(stack_pointer));
#else
asm volatile ("mov %%esp, %0" : "=r"(stack_pointer));
#endif
/* Avoid reentrant exceptions, just call the hook if in one already. */
if (esp >= exception_stack && esp <= exception_stack_end)
if (stack_pointer >= exception_stack && stack_pointer <= exception_stack_end)
gdb_exception_hook(EXC_BP);
else
asm volatile ("int3");
@ -66,12 +70,12 @@ void gdb_arch_enter(void)
int gdb_arch_set_single_step(int on)
{
const u32 tf_bit = 1 << 8;
const size_t tf_bit = 1 << 8;
if (on)
exception_state->regs.eflags |= tf_bit;
exception_state->regs.reg_flags |= tf_bit;
else
exception_state->regs.eflags &= ~tf_bit;
exception_state->regs.reg_flags &= ~tf_bit;
return 0;
}