[PATCH] libgcc: Add DWARF info to aeabi_ldivmod and aeabi_uldivmod

[Meador Inge]

Hi All,

This patch fixes a minor annoyance that causes backtraces to disappear
inside of aeabi_ldivmod and aeabi_uldivmod due to the lack of appropriate
DWARF information.  I fixed the problem by adding the necessary cfi_*
macros in these functions.

OK?

2013-03-05  Meador Inge  <mead...@codesourcery.com>

        * config/arm/bpabi.S (aeabi_ldivmod): Add DWARF information for
        computing the location of the link register.
        (aeabi_uldivmod): Ditto.

Index: libgcc/config/arm/bpabi.S
===================================================================
--- libgcc/config/arm/bpabi.S   (revision 196470)
+++ libgcc/config/arm/bpabi.S   (working copy)
@@ -123,6 +123,7 @@ ARM_FUNC_START aeabi_ulcmp
 #ifdef L_aeabi_ldivmod
 
 ARM_FUNC_START aeabi_ldivmod
+       cfi_start       __aeabi_ldivmod, LSYM(Lend_aeabi_ldivmod)
        test_div_by_zero signed
 
        sub sp, sp, #8
@@ -132,17 +133,20 @@ ARM_FUNC_START aeabi_ldivmod
 #else
        do_push {sp, lr}
 #endif
+98:    cfi_push 98b - __aeabi_ldivmod, 0xe, -0xc, 0x10
        bl SYM(__gnu_ldivmod_helper) __PLT__
        ldr lr, [sp, #4]
        add sp, sp, #8
        do_pop {r2, r3}
        RET
+       cfi_end LSYM(Lend_aeabi_ldivmod)
        
 #endif /* L_aeabi_ldivmod */
 
 #ifdef L_aeabi_uldivmod
 
 ARM_FUNC_START aeabi_uldivmod
+       cfi_start       __aeabi_uldivmod, LSYM(Lend_aeabi_uldivmod)
        test_div_by_zero unsigned
 
        sub sp, sp, #8
@@ -152,11 +156,13 @@ ARM_FUNC_START aeabi_uldivmod
 #else
        do_push {sp, lr}
 #endif
+98:    cfi_push 98b - __aeabi_uldivmod, 0xe, -0xc, 0x10
        bl SYM(__gnu_uldivmod_helper) __PLT__
        ldr lr, [sp, #4]
        add sp, sp, #8
        do_pop {r2, r3}
        RET
-       
+       cfi_end LSYM(Lend_aeabi_uldivmod)
+
 #endif /* L_aeabi_divmod */