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arch/x86: prepare for having an idt in other stages

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Currently the idt setup and handling is only in ramstage. In
order to prepare having an exception handler in other stages
move the interrupt vector entry code to its own compilation
unit. vec0 and int_hand need to be global so c_start.S
references will resolve at link time.

BUG=b:72728953

Change-Id: I435b96d987d69fb41ea27a73e2dd634b5d6ee3d9
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/25760
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Aaron Durbin
2018-04-20 00:56:57 -06:00
committed by Patrick Georgi
parent 4886a6591b
commit 7a7c70b26a
3 changed files with 192 additions and 171 deletions
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171
src/arch/x86/c_start.S
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@ -123,177 +123,6 @@ _start:
hlt
jmp .Lhlt
vec0:
push $0 /* error code */
push $0 /* vector */
jmp int_hand
vec1:
push $0 /* error code */
push $1 /* vector */
jmp int_hand
vec2:
push $0 /* error code */
push $2 /* vector */
jmp int_hand
vec3:
push $0 /* error code */
push $3 /* vector */
jmp int_hand
vec4:
push $0 /* error code */
push $4 /* vector */
jmp int_hand
vec5:
push $0 /* error code */
push $5 /* vector */
jmp int_hand
vec6:
push $0 /* error code */
push $6 /* vector */
jmp int_hand
vec7:
push $0 /* error code */
push $7 /* vector */
jmp int_hand
vec8:
/* error code */
push $8 /* vector */
jmp int_hand
.word 0x9090
vec9:
push $0 /* error code */
push $9 /* vector */
jmp int_hand
vec10:
/* error code */
push $10 /* vector */
jmp int_hand
.word 0x9090
vec11:
/* error code */
push $11 /* vector */
jmp int_hand
.word 0x9090
vec12:
/* error code */
push $12 /* vector */
jmp int_hand
.word 0x9090
vec13:
/* error code */
push $13 /* vector */
jmp int_hand
.word 0x9090
vec14:
/* error code */
push $14 /* vector */
jmp int_hand
.word 0x9090
vec15:
push $0 /* error code */
push $15 /* vector */
jmp int_hand
vec16:
push $0 /* error code */
push $16 /* vector */
jmp int_hand
vec17:
/* error code */
push $17 /* vector */
jmp int_hand
.word 0x9090
vec18:
push $0 /* error code */
push $18 /* vector */
jmp int_hand
vec19:
push $0 /* error code */
push $19 /* vector */
jmp int_hand
int_hand:
/* At this point, on x86-32, on the stack there is:
* 0(%esp) vector
* 4(%esp) error code
* 8(%esp) eip
* 12(%esp) cs
* 16(%esp) eflags
*/
#ifdef __x86_64__
push %rdi
push %rsi
push %rbp
/* Original stack pointer */
lea 32(%rsp), %rbp
push %rbp
push %rbx
push %rdx
push %rcx
push %rax
push %rsp /* Pointer to structure on the stack */
call x86_exception
pop %rax /* Drop the pointer */
pop %rax
pop %rcx
pop %rdx
pop %rbx
pop %rbp /* Ignore saved %rsp value */
pop %rbp
pop %rsi
pop %rdi
add $8, %rsp /* pop of the vector and error code */
#else
pushl %edi
pushl %esi
pushl %ebp
/* Original stack pointer */
leal 32(%esp), %ebp
pushl %ebp
pushl %ebx
pushl %edx
pushl %ecx
pushl %eax
pushl %esp /* Pointer to structure on the stack */
call x86_exception
pop %eax /* Drop the pointer */
popl %eax
popl %ecx
popl %edx
popl %ebx
popl %ebp /* Ignore saved %esp value */
popl %ebp
popl %esi
popl %edi
addl $8, %esp /* pop of the vector and error code */
#endif
iret
#if IS_ENABLED(CONFIG_GDB_WAIT)
.globl gdb_stub_breakpoint