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[librm] Use garbage-collectable section names 

Allow unused sections of librm.o to be removed via --gc-sections.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/45/head
Michael Brown 2016-02-18 15:40:33 +00:00
parent a3b4d6328c
commit b1436e0b83
1 changed files with 26 additions and 22 deletions
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48
src/arch/x86/transitions/librm.S
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@ -37,7 +37,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
* "non absolute segment" error. This is most probably a bug in gas.
****************************************************************************
*/
.section ".data16", "aw", @progbits
.section ".data16.gdt", "aw", @progbits
.align 16
gdt:
gdtr: /* The first GDT entry is unused, the GDTR can fit here. */
@ -89,7 +89,7 @@ gdt_end:
* %edi : Physical base of protected-mode code (virt_offset)
****************************************************************************
*/
.section ".text16", "ax", @progbits
.section ".text16.init_librm", "ax", @progbits
.code16
.globl init_librm
init_librm:
@ -141,7 +141,7 @@ init_librm:
popl %eax
lret
.section ".text16", "ax", @progbits
.section ".text16.set_seg_base", "ax", @progbits
.code16
set_seg_base:
1: movw %ax, 2(%bx)
@ -167,7 +167,7 @@ set_seg_base:
*
****************************************************************************
*/
.section ".text16", "ax", @progbits
.section ".text16.real_to_prot", "ax", @progbits
.code16
real_to_prot:
/* Enable A20 line */
@ -219,7 +219,7 @@ real_to_prot:
orb $CR0_PE, %al
movl %eax, %cr0
data32 ljmp $VIRTUAL_CS, $r2p_pmode
.section ".text", "ax", @progbits
.section ".text.real_to_prot", "ax", @progbits
.code32
r2p_pmode:
/* Set up protected-mode data segments and stack pointer */
@ -272,7 +272,7 @@ r2p_pmode:
*
****************************************************************************
*/
.section ".text", "ax", @progbits
.section ".text.prot_to_real", "ax", @progbits
.code32
prot_to_real:
/* Copy real-mode global descriptor table register to RM code segment */
@ -311,7 +311,7 @@ prot_to_real:
movw %ax, %gs
movw %ax, %ss
ljmp $REAL_CS, $p2r_rmode
.section ".text16", "ax", @progbits
.section ".text16.prot_to_real", "ax", @progbits
.code16
p2r_rmode:
/* Load real-mode GDT */
@ -347,12 +347,12 @@ p2r_ljmp_rm_cs:
.globl rm_cs
.equ rm_cs, ( p2r_ljmp_rm_cs + 3 )
.section ".text16.data", "aw", @progbits
.section ".text16.data.rm_ds", "aw", @progbits
.globl rm_ds
rm_ds: .word 0
/* Real-mode global and interrupt descriptor table registers */
.section ".text16.data", "aw", @progbits
.section ".text16.data.rm_gdtr", "aw", @progbits
rm_gdtr:
.word 0 /* Limit */
.long 0 /* Base */
@ -398,7 +398,7 @@ rm_gdtr:
#define PC_OFFSET_FUNCTION ( PC_OFFSET_RETADDR + 4 )
#define PC_OFFSET_END ( PC_OFFSET_FUNCTION + 4 )
.section ".text16", "ax", @progbits
.section ".text16.prot_call", "ax", @progbits
.code16
.globl prot_call
prot_call:
@ -423,7 +423,7 @@ prot_call:
movl $PC_OFFSET_END, %ecx
pushl $pc_pmode
jmp real_to_prot
.section ".text", "ax", @progbits
.section ".text.prot_call", "ax", @progbits
.code32
pc_pmode:
/* Call function */
@ -437,7 +437,7 @@ pc_pmode:
movl %esp, %esi
pushl $pc_rmode
jmp prot_to_real
.section ".text16", "ax", @progbits
.section ".text16.prot_call", "ax", @progbits
.code16
pc_rmode:
/* Restore registers and flags and return */
@ -484,7 +484,7 @@ pc_rmode:
#define RC_OFFSET_FUNCTION ( RC_OFFSET_RETADDR + 4 )
#define RC_OFFSET_END ( RC_OFFSET_FUNCTION + 4 )
.section ".text", "ax", @progbits
.section ".text.real_call", "ax", @progbits
.code32
.globl real_call
real_call:
@ -497,7 +497,7 @@ real_call:
pushl $rc_rmode
movl $rm_default_gdtr_idtr, %esi
jmp prot_to_real
.section ".text16", "ax", @progbits
.section ".text16.real_call", "ax", @progbits
.code16
rc_rmode:
/* Call real-mode function */
@ -513,7 +513,7 @@ rc_rmode:
movl $RC_OFFSET_RETADDR, %ecx
pushl $rc_pmode
jmp real_to_prot
.section ".text", "ax", @progbits
.section ".text.real_call", "ax", @progbits
.code32
rc_pmode:
/* Restore registers and return */
@ -524,11 +524,11 @@ rc_pmode:
/* Function vector, used because "call xx(%sp)" is not a valid
* 16-bit expression.
*/
.section ".data16", "aw", @progbits
.section ".bss16.rc_function", "aw", @nobits
rc_function: .word 0, 0
/* Default real-mode global and interrupt descriptor table registers */
.section ".data", "aw", @progbits
.section ".data.rm_default_gdtr_idtr", "aw", @progbits
rm_default_gdtr_idtr:
.word 0 /* Global descriptor table limit */
.long 0 /* Global descriptor table base */
@ -542,7 +542,7 @@ rm_default_gdtr_idtr:
*
****************************************************************************
*/
.section ".text16", "ax", @progbits
.section ".text16.flatten_real_mode", "ax", @progbits
.code16
.globl flatten_real_mode
flatten_real_mode:
@ -559,7 +559,7 @@ flatten_real_mode:
/* Return */
ret
.section ".text", "ax", @progbits
.section ".text.flatten_dummy", "ax", @progbits
.code32
flatten_dummy:
ret
@ -638,11 +638,15 @@ interrupt_wrapper:
* to us.
****************************************************************************
*/
.section ".data", "aw", @progbits
.section ".bss.rm_sp", "aw", @nobits
.globl rm_sp
rm_sp: .word 0
.section ".bss.rm_ss", "aw", @nobits
.globl rm_ss
rm_ss: .word 0
.section ".data.pm_esp", "aw", @progbits
pm_esp: .long _estack
/****************************************************************************
@ -654,13 +658,13 @@ pm_esp: .long _estack
****************************************************************************
*/
/* Internal copies, created by init_librm (which runs in real mode) */
.section ".data16", "aw", @progbits
.section ".bss16.rm_virt_offset", "aw", @nobits
rm_virt_offset: .long 0
rm_text16: .long 0
rm_data16: .long 0
/* Externally-visible copies, created by real_to_prot */
.section ".data", "aw", @progbits
.section ".bss.virt_offset", "aw", @nobits
.globl virt_offset
virt_offset: .long 0
.globl text16