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* [Bug gdb/26313] New: [aarch64] GDB doesn't skip prologues properly
@ 2020-07-29 12:35 luis.machado at linaro dot org
2020-07-29 13:01 ` [Bug gdb/26313] " luis.machado at linaro dot org
2022-04-09 15:07 ` [Bug tdep/26313] " tromey at sourceware dot org
0 siblings, 2 replies; 3+ messages in thread
From: luis.machado at linaro dot org @ 2020-07-29 12:35 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=26313
Bug ID: 26313
Summary: [aarch64] GDB doesn't skip prologues properly
Product: gdb
Version: HEAD
Status: NEW
Severity: normal
Priority: P1
Component: gdb
Assignee: unassigned at sourceware dot org
Reporter: luis.machado at linaro dot org
CC: alan.hayward at arm dot com
Target Milestone: ---
Host: aarch64-*
Target: aarch64-*
Build: aarch64-*
Using gdb.arch/aarch64-prologue.exp, if we try to insert a breakpoint into
excessiveprologue, it will be inserted midway through the prologue. This is
incorrect.
The correct position should be the branch instruction.
--
(gdb) disass excessiveprologue
Dump of assembler code for function excessiveprologue:
0x00000000000007cc <+0>: stp x29, x30, [sp, #-208]!
0x00000000000007d0 <+4>: mov x29, sp
0x00000000000007d4 <+8>: stp w0, w1, [sp, #16]
0x00000000000007d8 <+12>: stp x2, x3, [sp, #24]
0x00000000000007dc <+16>: str w4, [sp, #40]
0x00000000000007e0 <+20>: str x5, [sp, #48]
0x00000000000007e4 <+24>: stur w6, [sp, #52]
0x00000000000007e8 <+28>: stur x7, [sp, #56]
0x00000000000007ec <+32>: stp s0, s1, [sp, #64]
0x00000000000007f0 <+36>: stp d2, d3, [sp, #72]
0x00000000000007f4 <+40>: stp q4, q5, [sp, #96]
0x00000000000007f8 <+44>: str b6, [sp, #128]
0x00000000000007fc <+48>: str h7, [sp, #132]
0x0000000000000800 <+52>: str s8, [sp, #136]
0x0000000000000804 <+56>: stur d9, [sp, #140]
0x0000000000000808 <+60>: stur q10, [sp, #148]
0x000000000000080c <+64>: stur b11, [sp, #164]
0x0000000000000810 <+68>: stur h12, [sp, #160]
0x0000000000000814 <+72>: stur s13, [sp, #172]
0x0000000000000818 <+76>: stur d14, [sp, #176]
0x000000000000081c <+80>: stur q15, [sp, #184]
0x0000000000000820 <+84>: bl 0x724 <innerfunc>
0x0000000000000824 <+88>: ldp w0, w1, [sp, #16]
0x0000000000000828 <+92>: ldp x2, x3, [sp, #24]
0x000000000000082c <+96>: ldr w4, [sp, #40]
0x0000000000000830 <+100>: ldr x5, [sp, #48]
0x0000000000000834 <+104>: ldur w6, [sp, #52]
0x0000000000000838 <+108>: ldur x7, [sp, #56]
0x000000000000083c <+112>: ldp s0, s1, [sp, #64]
0x0000000000000840 <+116>: ldp d2, d3, [sp, #72]
0x0000000000000844 <+120>: ldp q4, q5, [sp, #96]
0x0000000000000848 <+124>: ldr b6, [sp, #128]
0x000000000000084c <+128>: ldr h7, [sp, #132]
0x0000000000000850 <+132>: ldr s8, [sp, #136]
0x0000000000000854 <+136>: ldur d9, [sp, #140]
0x0000000000000858 <+140>: ldur q10, [sp, #148]
0x000000000000085c <+144>: ldur b11, [sp, #164]
0x0000000000000860 <+148>: ldur h12, [sp, #160]
0x0000000000000864 <+152>: ldur s13, [sp, #172]
0x0000000000000868 <+156>: ldur d14, [sp, #176]
0x000000000000086c <+160>: ldur q15, [sp, #184]
0x0000000000000870 <+164>: ldp x29, x30, [sp], #208
0x0000000000000874 <+168>: ret
End of assembler dump.
--
(gdb) b excessiveprologue
Breakpoint 1 at 0x804
The correct position should be 0x820.
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* [Bug gdb/26313] [aarch64] GDB doesn't skip prologues properly
2020-07-29 12:35 [Bug gdb/26313] New: [aarch64] GDB doesn't skip prologues properly luis.machado at linaro dot org
@ 2020-07-29 13:01 ` luis.machado at linaro dot org
2022-04-09 15:07 ` [Bug tdep/26313] " tromey at sourceware dot org
1 sibling, 0 replies; 3+ messages in thread
From: luis.machado at linaro dot org @ 2020-07-29 13:01 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=26313
--- Comment #1 from Luis Machado <luis.machado at linaro dot org> ---
The problem seems to be the lack of handling of OP_STURV in GDB's aarch64
prologue analyzer.
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* [Bug tdep/26313] [aarch64] GDB doesn't skip prologues properly
2020-07-29 12:35 [Bug gdb/26313] New: [aarch64] GDB doesn't skip prologues properly luis.machado at linaro dot org
2020-07-29 13:01 ` [Bug gdb/26313] " luis.machado at linaro dot org
@ 2022-04-09 15:07 ` tromey at sourceware dot org
1 sibling, 0 replies; 3+ messages in thread
From: tromey at sourceware dot org @ 2022-04-09 15:07 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=26313
Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tromey at sourceware dot org
Component|gdb |tdep
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2020-07-29 12:35 [Bug gdb/26313] New: [aarch64] GDB doesn't skip prologues properly luis.machado at linaro dot org
2020-07-29 13:01 ` [Bug gdb/26313] " luis.machado at linaro dot org
2022-04-09 15:07 ` [Bug tdep/26313] " tromey at sourceware dot org
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