From 8d4cb500507b019b24b0b7ccba39b37c6a0efcfc Mon Sep 17 00:00:00 2001
From: Peiwei Hu <jlu.hpw@foxmail.com>
Date: Mon, 15 Jan 2024 21:33:54 +0800
Subject: [PATCH] v850 support for getting main offset
---
librz/bin/format/elf/elf_info.c | 28 +++++++++++++++++++++++++
test/db/analysis/v850 | 37 +++++++++++++++++++++++++++++++--
2 files changed, 63 insertions(+), 2 deletions(-)
diff --git a/librz/bin/format/elf/elf_info.c b/librz/bin/format/elf/elf_info.c
index 26bf3d6b498..0d07844ef41 100644
--- a/librz/bin/format/elf/elf_info.c
+++ b/librz/bin/format/elf/elf_info.c
@@ -442,6 +442,29 @@ static ut64 get_main_offset_mips(ELFOBJ *bin, ut64 entry, ut8 *buf, size_t size)
return 0;
}
+static ut64 get_main_offset_v850(ELFOBJ *bin, ut64 entry, ut8 *buf) {
+ size_t delta = 0;
+
+ /* distinguish by the first two instructions */
+
+ if (!memcmp(buf, "\x20\xa6\xff\x00\x35\x06\xff\xff\x00\x00", 10)) {
+ /* movea 0xFF, r0, r20; mov 0xFFFF, r21 */
+ delta = 0x64;
+ } else if (!memcmp(buf, "\x20\xa6\xff\x00\x00\xa8", 6)) {
+ /* movea 0xFF, r0, r20 ; mov r0, r21 */
+ delta = 0x4e;
+ }
+
+ if (!delta) {
+ return UT64_MAX;
+ }
+
+ ut16 jmp_offset = rz_read_le16(buf + delta);
+ ut64 entry_vaddr = Elf_(rz_bin_elf_p2v)(bin, entry);
+ ut64 vaddr = (entry_vaddr + (delta - 2) + jmp_offset) & ~1;
+ return Elf_(rz_bin_elf_v2p)(bin, vaddr);
+}
+
static ut64 get_main_offset_arm_glibc_thumb(ELFOBJ *bin, ut64 entry, ut8 *buf) {
size_t delta = 0;
@@ -1964,5 +1987,10 @@ ut64 Elf_(rz_bin_elf_get_main_offset)(RZ_NONNULL ELFOBJ *bin) {
return main_addr;
}
+ main_addr = get_main_offset_v850(bin, entry, buf);
+ if (main_addr != UT64_MAX) {
+ return main_addr;
+ }
+
return get_main_offset_from_symbol(bin);
}
diff --git a/test/db/analysis/v850 b/test/db/analysis/v850
index 26309a3cab8..3e022e98662 100644
--- a/test/db/analysis/v850
+++ b/test/db/analysis/v850
@@ -7,7 +7,7 @@ EOF
EXPECT=<<EOF
0x00100018 3 84 fcn.00100018
0x0010006c 1 36 sym._compute
-0x00100090 1 64 sym._main
+0x00100090 1 64 main
0x001000d0 5 74 sym.___main
0x0010011a 3 34 sym._exit
0x0010013c 18 768 sym.__printf_r
@@ -354,7 +354,7 @@ EXPECT=<<EOF
0x001045d4 4 128 -> 80 sym._red_prompt
0x001048ea 1 66 sym._red_open
0x00104ab0 1 44 sym._red_help
-0x00104adc 1 150 sym._main
+0x00104adc 1 150 main
EOF
RUN
@@ -396,3 +396,36 @@ r25 = (byte) *(r8805 + 0x5)
r9 = r0
EOF
RUN
+
+NAME=v850 s main hello-v850e
+FILE=bins/v850/hello-v850e
+CMDS=<<EOF
+s main
+s
+EOF
+EXPECT=<<EOF
+0x100090
+EOF
+RUN
+
+NAME=v850 s main hello-v850e_stripped
+FILE=bins/v850/hello-v850e_stripped
+CMDS=<<EOF
+s main
+s
+EOF
+EXPECT=<<EOF
+0x100090
+EOF
+RUN
+
+NAME=v850 s main ired_v850
+FILE=bins/v850/ired_v850
+CMDS=<<EOF
+s main
+s
+EOF
+EXPECT=<<EOF
+0x104adc
+EOF
+RUN