mips: add CFI directives to assembler sources, NDMS-1223

CFI directives moved to .debug_frame section (instead of .eh_frame)
since these may be removed by a strip utility.

crt/mips/crti.s

@@ -1,19 +1,30 @@
+.cfi_sections .debug_frame
 .set noreorder
 
 .section .init
 .global _init
 .type _init,@function
 .align 2
 _init:
+	.cfi_startproc
 	subu $sp,$sp,32
+	.cfi_adjust_cfa_offset 32
 	sw $gp,24($sp)
+	.cfi_rel_offset $gp, 24
 	sw $ra,28($sp)
+	.cfi_rel_offset $ra, 28
+	.cfi_endproc
 
 .section .fini
 .global _fini
 .type _fini,@function
 .align 2
 _fini:
+	.cfi_startproc
 	subu $sp,$sp,32
+	.cfi_adjust_cfa_offset 32
 	sw $gp,24($sp)
+	.cfi_rel_offset $gp, 24
 	sw $ra,28($sp)
+	.cfi_rel_offset $ra, 28
+	.cfi_endproc

crt/mips/crtn.s

@@ -1,13 +1,20 @@
+.cfi_sections .debug_frame
 .set noreorder
 
 .section .init
+	.cfi_startproc
 	lw $gp,24($sp)
 	lw $ra,28($sp)
 	j $ra
 	addu $sp,$sp,32
+	.cfi_adjust_cfa_offset -32
+	.cfi_endproc
 
 .section .fini
+	.cfi_startproc
 	lw $gp,24($sp)
 	lw $ra,28($sp)
 	j $ra
 	addu $sp,$sp,32
+	.cfi_adjust_cfa_offset -32
+	.cfi_endproc

src/ldso/mips/dlsym.s

@@ -1,17 +1,24 @@
+.cfi_sections .debug_frame
 .set noreorder
 .global dlsym
 .hidden __dlsym
 .type dlsym,@function
 dlsym:
+	.cfi_startproc
 	lui $gp, %hi(_gp_disp)
 	addiu $gp, %lo(_gp_disp)
 	addu $gp, $gp, $25
 	move $6, $ra
 	lw $25, %call16(__dlsym)($gp)
 	addiu $sp, $sp, -16
+	.cfi_adjust_cfa_offset 16
 	sw $ra, 12($sp)
+	.cfi_rel_offset $ra, 12
 	jalr $25
 	nop
 	lw $ra, 12($sp)
+	.cfi_restore $ra
 	jr $ra
 	addiu $sp, $sp, 16
+	.cfi_adjust_cfa_offset -16
+	.cfi_endproc

src/signal/mips/restore.s

@@ -1,15 +1,20 @@
+.cfi_sections .debug_frame
 .set noreorder
 
 .global __restore_rt
 .hidden __restore_rt
 .type   __restore_rt,@function
 __restore_rt:
+	.cfi_startproc
 	li $2, 4193
 	syscall
+	.cfi_endproc
 
 .global __restore
 .hidden __restore
 .type   __restore,@function
 __restore:
+	.cfi_startproc
 	li $2, 4119
 	syscall
+	.cfi_endproc

src/signal/mips/sigsetjmp.s

@@ -1,3 +1,4 @@
+.cfi_sections .debug_frame
 .set noreorder
 
 .global sigsetjmp
@@ -6,6 +7,7 @@
 .type __sigsetjmp,@function
 sigsetjmp:
 __sigsetjmp:
+	.cfi_startproc
 	lui $gp, %hi(_gp_disp)
 	addiu $gp, %lo(_gp_disp)
 	beq $5, $0, 1f
@@ -31,3 +33,4 @@ __sigsetjmp:
 1:	lw $25, %call16(setjmp)($gp)
 	jr $25
 	 nop
+	.cfi_endproc

src/thread/mips/__unmapself.s

@@ -1,10 +1,15 @@
+.cfi_sections .debug_frame
 .set noreorder
 .global __unmapself
 .type   __unmapself,@function
 __unmapself:
+	.cfi_startproc
 	move $sp, $25
+	.cfi_undefined $sp
+	.cfi_def_cfa_offset 0
 	li $2, 4091
 	syscall
 	li $4, 0
 	li $2, 4001
 	syscall
+	.cfi_endproc

src/thread/mips/clone.s

@@ -1,8 +1,10 @@
+.cfi_sections .debug_frame
 .set noreorder
 .global __clone
 .hidden __clone
 .type   __clone,@function
 __clone:
+	.cfi_startproc
 	# Save function pointer and argument pointer on new thread stack
 	and $5, $5, -8
 	subu $5, $5, 16
@@ -14,23 +16,28 @@ __clone:
 	lw $7, 20($sp)
 	lw $9, 24($sp)
 	subu $sp, $sp, 16
+	.cfi_adjust_cfa_offset 16
 	sw $9, 16($sp)
 	li $2, 4120
 	syscall
 	beq $7, $0, 1f
 	nop
 	addu $sp, $sp, 16
+	.cfi_adjust_cfa_offset -16
 	jr $ra
 	subu $2, $0, $2
 1:	beq $2, $0, 1f
 	nop
 	addu $sp, $sp, 16
+	.cfi_adjust_cfa_offset -16
 	jr $ra
 	nop
-1:	lw $25, 0($sp)
+1:	.cfi_undefined $ra
+	lw $25, 0($sp)
 	lw $4, 4($sp)
 	jalr $25
 	nop
 	move $4, $2
 	li $2, 4001
 	syscall
+	.cfi_endproc

src/thread/mips/syscall_cp.s

@@ -1,3 +1,4 @@
+.cfi_sections .debug_frame
 .set    noreorder
 
 .global __cp_begin
@@ -14,7 +15,9 @@
 .hidden __syscall_cp_asm
 .type   __syscall_cp_asm,@function
 __syscall_cp_asm:
+	.cfi_startproc
 	subu    $sp, $sp, 32
+	.cfi_adjust_cfa_offset 32
 __cp_begin:
 	lw      $4, 0($4)
 	bne     $4, $0, __cp_cancel
@@ -35,14 +38,17 @@ __cp_begin:
 __cp_end:
 	beq     $7, $0, 1f
 	addu    $sp, $sp, 32
+	.cfi_adjust_cfa_offset -32
 	subu    $2, $0, $2
 1:	jr      $ra
 	nop
 
 __cp_cancel:
 	move    $2, $ra
+	.cfi_register $ra, $2
 	bal     1f
 	addu    $sp, $sp, 32
+	.cfi_adjust_cfa_offset -32
 	.gpword .
 	.gpword __cancel
 1:	lw      $3, ($ra)
@@ -51,3 +57,5 @@ __cp_cancel:
 	addu    $25, $25, $3
 	jr      $25
 	move    $ra, $2
+	.cfi_restore $ra
+	.cfi_endproc

src/unistd/mips/pipe.s

@@ -1,8 +1,10 @@
+.cfi_sections .debug_frame
 .set noreorder
 
 .global pipe
 .type   pipe,@function
 pipe:
+	.cfi_startproc
 	lui $gp, %hi(_gp_disp)
 	addiu $gp, %lo(_gp_disp)
 	addu $gp, $gp, $25
@@ -18,3 +20,4 @@ pipe:
 	move $2, $0
 	jr $ra
 	nop
+	.cfi_endproc