0e24611f57
The FP8 formats have a "_" in the name so that they are: 1. Easier to read. 2. Possible to use in register expressions if/when they are supported. Some other bits do have defined meanings but they are not simple to name. Better that folks read the manual for those. See this page for the full details: https://developer.arm.com/documentation/ddi0601/2024-06/AArch64-Registers/FPMR--Floating-point-Mode-Register
64 lines
2.0 KiB
Python
64 lines
2.0 KiB
Python
"""
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Test lldb's ability to read and write the AArch64 FPMR register.
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"""
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import lldb
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from lldbsuite.test.decorators import *
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from lldbsuite.test.lldbtest import *
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from lldbsuite.test import lldbutil
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class AArch64LinuxFPMR(TestBase):
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NO_DEBUG_INFO_TESTCASE = True
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@skipUnlessArch("aarch64")
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@skipUnlessPlatform(["linux"])
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def test_fpmr_register(self):
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if not self.isAArch64FPMR():
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self.skipTest("FPMR must be present.")
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self.build()
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self.runCmd("file " + self.getBuildArtifact("a.out"), CURRENT_EXECUTABLE_SET)
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lldbutil.run_break_set_by_file_and_line(
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self,
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"main.c",
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line_number("main.c", "// Set break point at this line."),
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num_expected_locations=1,
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)
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self.runCmd("run", RUN_SUCCEEDED)
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if self.process().GetState() == lldb.eStateExited:
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self.fail("Test program failed to run.")
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self.expect(
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"thread list",
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STOPPED_DUE_TO_BREAKPOINT,
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substrs=["stopped", "stop reason = breakpoint"],
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)
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# This has been set by the program.
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expected_fpmr = (0b101010 << 32) | 0b101
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self.expect(
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"register read --all",
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substrs=["Floating Point Mode Register", f"fpmr = {expected_fpmr:#018x}"],
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)
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if self.hasXMLSupport():
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self.expect(
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"register read fpmr", substrs=["LSCALE2 = 42", "F8S1 = FP8_E4M3 | 0x4"]
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)
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# Write a value for the program to find. Same fields but with bit values
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# inverted.
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new_fpmr = (0b010101 << 32) | 0b010
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self.runCmd(f"register write fpmr {new_fpmr:#x}")
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# This value should be saved and restored after expressions.
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self.runCmd("p expr_func()")
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self.expect("register read fpmr", substrs=[f"fpmr = {new_fpmr:#018x}"])
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# 0 means the program found the new value in the sysreg as expected.
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self.expect("continue", substrs=["exited with status = 0"])
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